tag:blogger.com,1999:blog-230212552013-06-19T21:43:07.846+02:00Internetworking perspectives by Ivan PepelnjakIvan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.comBlogger1843125CiscoIosHintsAndTrickshttp://feedburner.google.comSubscribe with My Yahoo!Subscribe with My AOLSubscribe with BloglinesSubscribe with GoogleSubscribe with PageflakesSubscribe with Live.comAdd to Any Feed Readertag:blogger.com,1999:blog-23021255.post-91572621498645404462013-06-19T06:53:00.000+02:002013-06-19T06:53:00.548+02:00<p>In the &quot;<a href="http://blog.ioshints.info/2013/05/optimal-l3-forwarding-with-varp-and.html">Optimal L3 Forwarding with VARP and Active/Active VRRP</a>&quot; blog post I made a remark along the lines of &quot;Things might get nasty [in Arista EOS Virtual ARP world] if you have configuration mismatches&quot;, resulting in a lengthy and amazingly insightful email exchange with <a href="http://www.linkedin.com/in/ltdatinterlinkcomau">Lincoln Dale</a> during which we ventured deeper and deeper down the Virtual ARP (VARP) rabbit hole. Here&#39;s what I learned during out trip:</p><a href="http://blog.ioshints.info/2013/06/arista-eos-virtual-arp-varp-behind.html#more">Read more ...</a><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=u3icERuPj9k:XphgZwxMhi0:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=u3icERuPj9k:XphgZwxMhi0:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=u3icERuPj9k:XphgZwxMhi0:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=u3icERuPj9k:XphgZwxMhi0:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=u3icERuPj9k:XphgZwxMhi0:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=u3icERuPj9k:XphgZwxMhi0:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=u3icERuPj9k:XphgZwxMhi0:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=u3icERuPj9k:XphgZwxMhi0:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=u3icERuPj9k:XphgZwxMhi0:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/u3icERuPj9k" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com0http://blog.ioshints.info/2013/06/arista-eos-virtual-arp-varp-behind.htmltag:blogger.com,1999:blog-23021255.post-23308542941100061232013-06-18T07:40:00.000+02:002013-06-18T07:40:00.175+02:00<p>The true OpenFlow zealots would love you to believe that you can drop whatever you’ve been doing before and replace it with a clean-slate solution using dumbest (and cheapest) possible switches and OpenFlow controllers. </p><p>In real world, your shiny new network has to communicate with the outside world … or you could take the approach most controller vendors did, decide to pretend STP is irrelevant, and ask people to configure static LAGs because you’re also not supporting LACP.</p><a href="http://blog.ioshints.info/2013/06/implementing-control-plane-protocols.html#more">Read more ...</a><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=243qkHViN1E:i_XuaFkARTE:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=243qkHViN1E:i_XuaFkARTE:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=243qkHViN1E:i_XuaFkARTE:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=243qkHViN1E:i_XuaFkARTE:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=243qkHViN1E:i_XuaFkARTE:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=243qkHViN1E:i_XuaFkARTE:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=243qkHViN1E:i_XuaFkARTE:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=243qkHViN1E:i_XuaFkARTE:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=243qkHViN1E:i_XuaFkARTE:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/243qkHViN1E" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com4http://blog.ioshints.info/2013/06/implementing-control-plane-protocols.htmltag:blogger.com,1999:blog-23021255.post-11211101719735015912013-06-17T07:28:00.000+02:002013-06-17T07:28:00.813+02:00<p>I was reading <a href="http://www.definethecloud.net/what-network-virtualization-isnt">What Network Virtualization Isn’t</a> from Jon Onisick the other day and started experiencing all sorts of unpleasant flashbacks caused by my overly long exposure to networking industry missteps and dead ends touted as the best possible solutions or architectures in the days of their glory:</p><a href="http://blog.ioshints.info/2013/06/network-virtualization-and-spaghetti.html#more">Read more ...</a><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=wx7uty5KnDE:vivnPdf_Zt0:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=wx7uty5KnDE:vivnPdf_Zt0:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=wx7uty5KnDE:vivnPdf_Zt0:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=wx7uty5KnDE:vivnPdf_Zt0:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=wx7uty5KnDE:vivnPdf_Zt0:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=wx7uty5KnDE:vivnPdf_Zt0:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=wx7uty5KnDE:vivnPdf_Zt0:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=wx7uty5KnDE:vivnPdf_Zt0:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=wx7uty5KnDE:vivnPdf_Zt0:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/wx7uty5KnDE" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com7http://blog.ioshints.info/2013/06/network-virtualization-and-spaghetti.htmltag:blogger.com,1999:blog-23021255.post-72993789383898251992013-06-14T06:56:00.001+02:002013-06-14T06:57:35.262+02:00<p>In the <a href="http://www.ipspace.net/TCP,_HTTP_and_SPDY">TCP, HTTP and SPDY</a> webinar I described the <a href="http://demo.ipspace.net/get/1%20-%20Problem.mp4">web application performance roadblocks</a> caused by <a href="http://demo.ipspace.net/get/2%20-%20TCP%20HTTP.mp4">TCP and HTTP</a> and <a href="http://demo.ipspace.net/get/4%20-%20TCP%20HTTP%20Improvements.mp4">HTTP improvements</a> that remove most of them. Google went a step further and created SPDY, a totally redesigned HTTP. What is SPDY? Is it really the final solution? How much does it help? Hopefully you’ll find <a href="http://demo.ipspace.net/get/5%20-%20SPDY.mp4">answers to some of these questions</a> in the last part of the webinar.</p><p class="note">The whole webinar is also available on <a href="https://www.udemy.com/tcp-http-spdy-deep-dive/">Udemy</a> - it’s free but you’ll have to register (or log in with Facebook) to get access.</p><div class='jump-link'><a href="http://demo.ipspace.net/get/5%20-%20SPDY.mp4">Watch the video</a></div><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=k4pMabOl3NM:UOJ5EkadvJM:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=k4pMabOl3NM:UOJ5EkadvJM:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=k4pMabOl3NM:UOJ5EkadvJM:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=k4pMabOl3NM:UOJ5EkadvJM:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=k4pMabOl3NM:UOJ5EkadvJM:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=k4pMabOl3NM:UOJ5EkadvJM:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=k4pMabOl3NM:UOJ5EkadvJM:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=k4pMabOl3NM:UOJ5EkadvJM:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=k4pMabOl3NM:UOJ5EkadvJM:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/k4pMabOl3NM" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com1http://blog.ioshints.info/2013/06/will-spdy-solve-web-application.htmltag:blogger.com,1999:blog-23021255.post-74661321413456553142013-06-13T07:22:00.000+02:002013-06-17T11:57:48.155+02:00<p>A while ago someone asked what the difference between access and prefix lists is on the <a href="http://networkengineering.stackexchange.com/">Network Engineering Stack Exchange</a> web site (a fantastic resource brought to life primarily by sheer persistence of Jeremy Stretch, who had to fight troves of naysayers with somewhat limited insight claiming everything one would want to discuss about networking falls under server administration web site). </p><p>The question triggered a lengthy wandering down the memory lane … and here&#39;s the history of how the two came into being (and why they are the way they are).</p><a href="http://blog.ioshints.info/2013/06/the-difference-between-access-lists-and.html#more">Read more ...</a><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=cZfEamXrfs4:axFZOedvtTU:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=cZfEamXrfs4:axFZOedvtTU:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=cZfEamXrfs4:axFZOedvtTU:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=cZfEamXrfs4:axFZOedvtTU:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=cZfEamXrfs4:axFZOedvtTU:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=cZfEamXrfs4:axFZOedvtTU:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=cZfEamXrfs4:axFZOedvtTU:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=cZfEamXrfs4:axFZOedvtTU:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=cZfEamXrfs4:axFZOedvtTU:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/cZfEamXrfs4" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com4http://blog.ioshints.info/2013/06/the-difference-between-access-lists-and.htmltag:blogger.com,1999:blog-23021255.post-19773871861596291292013-06-12T07:20:00.000+02:002013-06-12T07:20:00.247+02:00<p>An individual focused more on sensationalism than content deemed it appropriate to <a href="http://www.theregister.co.uk/2013/05/24/network_configuration_automation/">publish an article</a> declaring networking engineers an endangered species on an industry press web site that I considered somewhat reliable in the past.</p><p>The resulting flurry of expected blog posts included an <a href="http://packetpushers.net/youve-changed-sdns-casualties/">interesting one from Steven Iveson</a> in which he made a good point: it’s easy for the <em>cream-of-the-crop </em>not to be concerned, but what about others lower down the pile. As always, it makes sense to do a bit of reality check.</p><a href="http://blog.ioshints.info/2013/06/response-sdns-casualties.html#more">Read more ...</a><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=zIzkWj6Z_1c:blBFVjTSevA:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=zIzkWj6Z_1c:blBFVjTSevA:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=zIzkWj6Z_1c:blBFVjTSevA:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=zIzkWj6Z_1c:blBFVjTSevA:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=zIzkWj6Z_1c:blBFVjTSevA:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=zIzkWj6Z_1c:blBFVjTSevA:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=zIzkWj6Z_1c:blBFVjTSevA:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=zIzkWj6Z_1c:blBFVjTSevA:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=zIzkWj6Z_1c:blBFVjTSevA:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/zIzkWj6Z_1c" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com17http://blog.ioshints.info/2013/06/response-sdns-casualties.htmltag:blogger.com,1999:blog-23021255.post-26133693801045886492013-06-11T09:51:00.000+02:002013-06-11T09:51:00.651+02:00<p>Could you <a href="http://blog.ioshints.info/2012/05/ipv6-only-data-center-built-by-tore.html">run a data center exclusively on IPv6</a>? What would you need to do to interact with the IPv4 side of the Internet? <a href="http://www.ripe.net/lir-services/training/e-learning-26042013/ipv6/tore-anderson">Tore Anderson</a> from Redpill Linpro figured out that IPv4 addresses are better used to enable the service for the servers hosted in their datacenter instead of “wasting” them for network infrastructure and data center connectivity, and he’ll describe <a href="http://tools.ietf.org/html/draft-anderson-siit-dc-00">how he’s doing it</a> (in production environment) in tomorrow’s free <a href="http://www.ipspace.net/IPv6-Only_Data_Centers">IPv6-Only Data Centers</a> webinar.</p><div class='jump-link'><a href="http://ipv6datacenter-blog.eventbrite.com/">Register now</a></div><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=53K7ceWLupE:BsApIENj8WY:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=53K7ceWLupE:BsApIENj8WY:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=53K7ceWLupE:BsApIENj8WY:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=53K7ceWLupE:BsApIENj8WY:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=53K7ceWLupE:BsApIENj8WY:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=53K7ceWLupE:BsApIENj8WY:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=53K7ceWLupE:BsApIENj8WY:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=53K7ceWLupE:BsApIENj8WY:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=53K7ceWLupE:BsApIENj8WY:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/53K7ceWLupE" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com3http://blog.ioshints.info/2013/06/watch-tore-anderson-describing-ipv6.htmltag:blogger.com,1999:blog-23021255.post-82651107304670119522013-06-10T07:02:00.000+02:002013-06-10T07:02:00.461+02:00<p>Meeting Brad Hedlund in person was definitely one of the highlights of my Interop 2013 week. We had an awesome conversation and quickly realized how closely aligned our views of <a href="http://blog.ioshints.info/2013/04/vlans-are-wrong-abstraction-for-virtual.html">VLANs</a>, <a href="http://blog.ioshints.info/2011/12/decouple-virtual-networking-from.html">overlay networks</a> and <a href="http://blog.ioshints.info/2013/05/simplify-your-disaster-recovery-with.html">virtual appliances</a> are. </p><p>Not surprisingly, Brad quickly improved my ideas with a radical proposal: running BGP between the virtual and the physical world.</p><a href="http://blog.ioshints.info/2013/06/dynamic-routing-with-virtual-appliances.html#more">Read more ...</a><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=J8oGNZlTIuo:2sZioLARREo:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=J8oGNZlTIuo:2sZioLARREo:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=J8oGNZlTIuo:2sZioLARREo:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=J8oGNZlTIuo:2sZioLARREo:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=J8oGNZlTIuo:2sZioLARREo:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=J8oGNZlTIuo:2sZioLARREo:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=J8oGNZlTIuo:2sZioLARREo:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=J8oGNZlTIuo:2sZioLARREo:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=J8oGNZlTIuo:2sZioLARREo:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/J8oGNZlTIuo" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com17http://blog.ioshints.info/2013/06/dynamic-routing-with-virtual-appliances.htmltag:blogger.com,1999:blog-23021255.post-67629705884588738062013-06-09T08:49:00.000+02:002013-06-09T08:49:23.893+02:00<p><a href="http://dilbert.com/strips/comic/2013-06-09/">Today's Dilbert</a> is dedicated to every networking and security vendor selling us <em>just good enough</em> solutions.</p><div class='separator'><a href='http://dilbert.com/strips/comic/2013-06-09/'><img src='http://dilbert.com/dyn/str_strip/000000000/00000000/0000000/100000/80000/3000/000/183025/183025.strip.print.gif' style='width: 560px'></a></div><p>Huge "Thank you!" to Scott Adams for another well-explained documentary!</p> <div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=xa5x50ThcZU:urtaiC_sg1Q:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=xa5x50ThcZU:urtaiC_sg1Q:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=xa5x50ThcZU:urtaiC_sg1Q:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=xa5x50ThcZU:urtaiC_sg1Q:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=xa5x50ThcZU:urtaiC_sg1Q:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=xa5x50ThcZU:urtaiC_sg1Q:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=xa5x50ThcZU:urtaiC_sg1Q:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=xa5x50ThcZU:urtaiC_sg1Q:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=xa5x50ThcZU:urtaiC_sg1Q:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/xa5x50ThcZU" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com0http://blog.ioshints.info/2013/06/long-live-just-good-enough.htmltag:blogger.com,1999:blog-23021255.post-52449653383460340842013-06-07T06:33:00.000+02:002013-06-07T06:33:41.516+02:00<p>IPv6 source address spoofing should be old news – it’s no different from its IPv4 counterpart. <a href="http://blog.ioshints.info/2011/05/ipv6-neighbor-discovery-exhaustion.html">Neighbor discovery exhaustion attack</a> is an IPv6-only phenomenon, enabled by huge IPv6 subnet sizes.</p><p>During the <a href="http://www.ipspace.net/IPv6_security">IPv6 Security</a> webinar Eric Vyncke described Cisco IOS mechanisms you can use to cope with both. Enjoy!</p><div class='jump-link'><a href="http://demo.ipspace.net/get/D5%20-%20IPv6%20Address%20Spoofing%20ND%20Attacks.mp4">Watch the video</a></div><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=_E6BrY1_noo:FbiPf13xo20:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=_E6BrY1_noo:FbiPf13xo20:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=_E6BrY1_noo:FbiPf13xo20:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=_E6BrY1_noo:FbiPf13xo20:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=_E6BrY1_noo:FbiPf13xo20:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=_E6BrY1_noo:FbiPf13xo20:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=_E6BrY1_noo:FbiPf13xo20:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=_E6BrY1_noo:FbiPf13xo20:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=_E6BrY1_noo:FbiPf13xo20:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/_E6BrY1_noo" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com0http://blog.ioshints.info/2013/06/ipv6-urpf-and-neighbor-discovery.htmltag:blogger.com,1999:blog-23021255.post-52565982081689591332013-06-06T07:21:00.000+02:002013-06-06T07:21:00.923+02:00<p>The upcoming <a href="http://www.ipspace.net/Enterasys_Robust_Data_Center_Interconnect_Solutions">Data Center Interconnect</a> webinar (<a href="http://enterasys.eventbrite.com">register</a>) is sponsored by <a href="http://www.enterasys.com">Enterasys Networks</a>, so it’s obvious that I’ll also mention how you can use their technology to solve particular data center interconnect problems, but that’s not all. The webinar will focus primarily on Whys, Hows and Whats of solving VM- and IP address mobility challenges in multi-data center environments.</p><p>Here are a few of the topics we’ll cover:</p><a href="http://blog.ioshints.info/2013/06/dirty-details-of-inter-dc-vm-and-ip.html#more">Read more ...</a><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=UqhMec7qxR4:COr83RC2mp8:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=UqhMec7qxR4:COr83RC2mp8:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=UqhMec7qxR4:COr83RC2mp8:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=UqhMec7qxR4:COr83RC2mp8:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=UqhMec7qxR4:COr83RC2mp8:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=UqhMec7qxR4:COr83RC2mp8:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=UqhMec7qxR4:COr83RC2mp8:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=UqhMec7qxR4:COr83RC2mp8:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=UqhMec7qxR4:COr83RC2mp8:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/UqhMec7qxR4" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com0http://blog.ioshints.info/2013/06/dirty-details-of-inter-dc-vm-and-ip.htmltag:blogger.com,1999:blog-23021255.post-32455348594657702072013-06-05T07:36:00.000+02:002013-06-09T08:44:22.578+02:00<p>One of my blogger friends sent me an interesting observation:</p><blockquote class="cite">After talking to networking vendors I&#39;m inclined to think they are going to focus on a mesh of overlays from the TOR, with possible use of overlays between vswitch and TOR too if desired - drawing analogies to MPLS with ToR a PE and vSwitch a CE. Aside from selling more hardware for this, I&#39;m not drawn towards a solution like this bc it doesn&#39;t help with full network virtualization and a network abstraction for VMs.</blockquote><p>The whole situation reminds me of the good old SNA and APPN days with networking vendors playing the IBM part of the comedy.</p><a href="http://blog.ioshints.info/2013/06/network-virtualization-at-tor-switches.html#more">Read more ...</a><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=m1nTOGjAj08:kXTUfHwsjQg:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=m1nTOGjAj08:kXTUfHwsjQg:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=m1nTOGjAj08:kXTUfHwsjQg:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=m1nTOGjAj08:kXTUfHwsjQg:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=m1nTOGjAj08:kXTUfHwsjQg:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=m1nTOGjAj08:kXTUfHwsjQg:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=m1nTOGjAj08:kXTUfHwsjQg:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=m1nTOGjAj08:kXTUfHwsjQg:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=m1nTOGjAj08:kXTUfHwsjQg:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/m1nTOGjAj08" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com9http://blog.ioshints.info/2013/06/network-virtualization-at-tor-switches.htmltag:blogger.com,1999:blog-23021255.post-23202356874239370012013-06-04T07:16:00.000+02:002013-06-04T15:55:54.646+02:00<p>The <a href="http://blog.ioshints.info/2013/05/optimal-l3-forwarding-with-varp-and.html">Optimal L3 Forwarding with VARP/VRRP</a> post generated numerous comments, ranging from technical questions about VARP (more about that in a few days) to remarks along the lines of “you can do that with X” or “vendor Y supports Z, which does the same thing.” It seems I’ve opened yet another can of worms, let’s try to tame and sort them.</p><a href="http://blog.ioshints.info/2013/06/vrrp-anycasts-fabrics-and-optimal.html#more">Read more ...</a><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=DjLmCj7BzLs:StEvM4ln-kg:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=DjLmCj7BzLs:StEvM4ln-kg:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=DjLmCj7BzLs:StEvM4ln-kg:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=DjLmCj7BzLs:StEvM4ln-kg:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=DjLmCj7BzLs:StEvM4ln-kg:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=DjLmCj7BzLs:StEvM4ln-kg:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=DjLmCj7BzLs:StEvM4ln-kg:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=DjLmCj7BzLs:StEvM4ln-kg:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=DjLmCj7BzLs:StEvM4ln-kg:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/DjLmCj7BzLs" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com2http://blog.ioshints.info/2013/06/vrrp-anycasts-fabrics-and-optimal.htmltag:blogger.com,1999:blog-23021255.post-19422211621516949882013-06-03T16:30:00.000+02:002013-06-03T16:36:08.908+02:00<p><a href="http://networkstatic.net/">Brent Salisbury</a> sent me a link to a <a href="http://ee380.stanford.edu/cgi-bin/videologger.php?target=130515-ee380-300.asx">fantastic OpenFlow/SDN presentation</a> <a href="http://www.eecs.berkeley.edu/Faculty/Homepages/shenker.html">Scott Shenker</a> did @ <a href="http://www.stanford.edu/class/ee380/">Stanford University</a> a few days ago. It’s a perfect introduction to the fundamental ideas behind SDN and therefore a must-see for everyone vaguely involved in networking.</p><p>Here are some of the highlights (from my highly biased perspective):</p><a href="http://blog.ioshints.info/2013/06/scott-shenker-on-openflow-and-sdn.html#more">Read more ...</a><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=J_oUbLyvtt8:e9BdIB8icyA:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=J_oUbLyvtt8:e9BdIB8icyA:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=J_oUbLyvtt8:e9BdIB8icyA:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=J_oUbLyvtt8:e9BdIB8icyA:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=J_oUbLyvtt8:e9BdIB8icyA:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=J_oUbLyvtt8:e9BdIB8icyA:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=J_oUbLyvtt8:e9BdIB8icyA:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=J_oUbLyvtt8:e9BdIB8icyA:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=J_oUbLyvtt8:e9BdIB8icyA:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/J_oUbLyvtt8" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com6http://blog.ioshints.info/2013/06/scott-shenker-on-openflow-and-sdn.htmltag:blogger.com,1999:blog-23021255.post-7926545249268428732013-06-02T10:26:00.000+02:002013-06-02T10:26:00.679+02:00<p>Brad Hedlund wrote another great article, this one explaining the <a href="http://bradhedlund.com/2013/05/28/what-is-network-virtualization/">fundamentals of network virtualization</a>. As you'll see, VMware (and everyone else) aims way higher than replacing VLANs with overlay networks. Highly recommended!</p><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=63SY3qOSNps:Lot7p77GSkY:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=63SY3qOSNps:Lot7p77GSkY:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=63SY3qOSNps:Lot7p77GSkY:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=63SY3qOSNps:Lot7p77GSkY:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=63SY3qOSNps:Lot7p77GSkY:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=63SY3qOSNps:Lot7p77GSkY:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=63SY3qOSNps:Lot7p77GSkY:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=63SY3qOSNps:Lot7p77GSkY:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=63SY3qOSNps:Lot7p77GSkY:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/63SY3qOSNps" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com1http://blog.ioshints.info/2013/06/what-is-network-virtualization.htmltag:blogger.com,1999:blog-23021255.post-62700032095861202692013-06-01T16:05:00.000+02:002013-06-01T16:05:01.007+02:00<p>It seems all networking bloggers get plenty of career-related questions: how should I start, what should I focus on, which certification should I pursue ... Finally someone decided to take a structured approach: Paul Stewart and John Harrington launched <a href="http://thetechinterview.com/">The Tech Interview</a> web site that should help you get all the answers in a single place.</p><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=-8ck1Yi4QFY:UBlDz5jpbLo:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=-8ck1Yi4QFY:UBlDz5jpbLo:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=-8ck1Yi4QFY:UBlDz5jpbLo:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=-8ck1Yi4QFY:UBlDz5jpbLo:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=-8ck1Yi4QFY:UBlDz5jpbLo:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=-8ck1Yi4QFY:UBlDz5jpbLo:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=-8ck1Yi4QFY:UBlDz5jpbLo:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=-8ck1Yi4QFY:UBlDz5jpbLo:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=-8ck1Yi4QFY:UBlDz5jpbLo:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/-8ck1Yi4QFY" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com0http://blog.ioshints.info/2013/06/the-tech-interview-site-launched.htmltag:blogger.com,1999:blog-23021255.post-67650724206585219242013-05-31T07:26:00.000+02:002013-05-31T07:26:00.716+02:00<p>Regardless of what the vendors are telling you, it’s hard to get data center disaster recovery right (unless you’re <a href="http://queue.acm.org/detail.cfm?id=2371297">running regular fire drills</a>), and your job usually gets harder due to the intricate (sometimes undocumented) intertwining of physical and virtual worlds. For example, do you know how to get the firewall and load balancer configurations from the failed site implemented in the equipment currently used at disaster recovery site?</p><p>Imagine a simple application stack with a few web servers, app servers and two database servers. There’s a firewall in front of the web servers and a load balancer tying all the segments together.</p><a href="http://blog.ioshints.info/2013/05/simplify-your-disaster-recovery-with.html#more">Read more ...</a><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=htHPBLfV6eg:OcloeLfJA5k:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=htHPBLfV6eg:OcloeLfJA5k:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=htHPBLfV6eg:OcloeLfJA5k:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=htHPBLfV6eg:OcloeLfJA5k:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=htHPBLfV6eg:OcloeLfJA5k:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=htHPBLfV6eg:OcloeLfJA5k:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=htHPBLfV6eg:OcloeLfJA5k:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=htHPBLfV6eg:OcloeLfJA5k:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=htHPBLfV6eg:OcloeLfJA5k:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/htHPBLfV6eg" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com4http://blog.ioshints.info/2013/05/simplify-your-disaster-recovery-with.htmltag:blogger.com,1999:blog-23021255.post-73675626687913118402013-05-30T07:17:00.000+02:002013-05-30T07:17:00.162+02:00<p>Loads of niche features got crammed into (MP)BGP and MPLS since I wrote my <a href="http://blog.ioshints.info/2007/06/using-mpls-vpn-books-to-study-for-ccip.html">MPLS books</a>, most of them trying to tweak BGP (a scalable and reasonably slow routing protocol dealing with behemoth tables) to behave more like an IGP would. </p><p>It looks like we’ll never see updated versions of the books, so I’ll try to cover the new features with short videos. The first one on the list: BGP Best External – a mechanism that speeds up MP-IBGP convergence in primary/backup PE-CE scenarios using EBGP.</p><a href="http://blog.ioshints.info/2013/05/bgp-best-external-explained.html#more">Read more ...</a><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=8HFWl7di2qU:2_457HzIb5c:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=8HFWl7di2qU:2_457HzIb5c:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=8HFWl7di2qU:2_457HzIb5c:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=8HFWl7di2qU:2_457HzIb5c:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=8HFWl7di2qU:2_457HzIb5c:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=8HFWl7di2qU:2_457HzIb5c:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=8HFWl7di2qU:2_457HzIb5c:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=8HFWl7di2qU:2_457HzIb5c:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=8HFWl7di2qU:2_457HzIb5c:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/8HFWl7di2qU" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com8http://blog.ioshints.info/2013/05/bgp-best-external-explained.htmltag:blogger.com,1999:blog-23021255.post-43893505773683130672013-05-29T07:14:00.000+02:002013-05-29T10:12:45.108+02:00<p>I’ve blogged about the <a href="http://blog.ioshints.info/2012/05/does-optimal-l3-forwarding-matter-in.html">need for optimal L3 forwarding across the whole data center</a> almost a year ago when I introduced it as one of the interesting requirements in <a href="http://www.ipspace.net/Data_Center_Fabrics">Data Center Fabrics</a> webinar. A year later, there are still only a few companies that can deliver this functionality.</p><a href="http://blog.ioshints.info/2013/05/optimal-l3-forwarding-with-varp-and.html#more">Read more ...</a><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=p0kvMvO9Dvw:sc7x4h_jGUQ:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=p0kvMvO9Dvw:sc7x4h_jGUQ:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=p0kvMvO9Dvw:sc7x4h_jGUQ:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=p0kvMvO9Dvw:sc7x4h_jGUQ:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=p0kvMvO9Dvw:sc7x4h_jGUQ:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=p0kvMvO9Dvw:sc7x4h_jGUQ:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=p0kvMvO9Dvw:sc7x4h_jGUQ:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=p0kvMvO9Dvw:sc7x4h_jGUQ:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=p0kvMvO9Dvw:sc7x4h_jGUQ:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/p0kvMvO9Dvw" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com12http://blog.ioshints.info/2013/05/optimal-l3-forwarding-with-varp-and.htmltag:blogger.com,1999:blog-23021255.post-17102510210107026362013-05-28T07:10:00.000+02:002013-05-28T07:10:00.020+02:00<p>The SDN industry probably considers me an old and grumpy naysayer (and I’m positive Mrs Y has a special place in their hearts after <a href="http://packetpushers.net/sdn-savior-or-grifter/">her recent blog post</a>), so I tried really hard to find a real-life example where OpenFlow could be used to solve <a href="http://telecomoccasionally.wordpress.com/2012/02/20/mid-market-innovators-dilemma/">mid-market innovator’s dilemma</a> to balance my usual <a href="http://demo.ipspace.net/get/OpenFlow%20SDN.pdf">OpenFlow and SDN</a> presentation.</p><a href="http://blog.ioshints.info/2013/05/could-ixps-use-openflow-to-scale.html#more">Read more ...</a><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=KtMvVii4nPs:s5lDZw0wE5Q:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=KtMvVii4nPs:s5lDZw0wE5Q:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=KtMvVii4nPs:s5lDZw0wE5Q:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=KtMvVii4nPs:s5lDZw0wE5Q:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=KtMvVii4nPs:s5lDZw0wE5Q:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=KtMvVii4nPs:s5lDZw0wE5Q:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=KtMvVii4nPs:s5lDZw0wE5Q:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=KtMvVii4nPs:s5lDZw0wE5Q:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=KtMvVii4nPs:s5lDZw0wE5Q:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/KtMvVii4nPs" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com0http://blog.ioshints.info/2013/05/could-ixps-use-openflow-to-scale.htmltag:blogger.com,1999:blog-23021255.post-13921006235791915522013-05-27T07:33:00.000+02:002013-05-27T07:33:00.703+02:00<p>The networking department at one of the leading US universities got a great idea last year: they were organizing a summer networking bootcamp for undergraduate students and decided to use some of my webinars as background/supplementary material. As we've been working with Central European universities for over a decade, we were able to add yet another product to the mix: <a href="http://stack.nil.com/C1256F620032CACB/NILLookup/IPPRe">IP Primer</a> (introduction to TCP/IP) which includes <a href="http://stack.nil.si/C1256F0A0048C79A/html/IP_Primer_Desc">hands-on exercises on live Cisco IOS routers</a>.</p><p>Their idea was obviously pretty successful – they'll do the same thing this year. Would you like to do something similar? <a href="http://cms.ipspace.net/bin/contact?StySu=Summer+Bootcamp">Contact me</a>, tell me more about your project, and I'm positive we'll find a way to help you.</p><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=3pg5s6kH_S4:DkTqdh9kWjE:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=3pg5s6kH_S4:DkTqdh9kWjE:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=3pg5s6kH_S4:DkTqdh9kWjE:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=3pg5s6kH_S4:DkTqdh9kWjE:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=3pg5s6kH_S4:DkTqdh9kWjE:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=3pg5s6kH_S4:DkTqdh9kWjE:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=3pg5s6kH_S4:DkTqdh9kWjE:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=3pg5s6kH_S4:DkTqdh9kWjE:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=3pg5s6kH_S4:DkTqdh9kWjE:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/3pg5s6kH_S4" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com0http://blog.ioshints.info/2013/05/enhance-your-summer-bootcamp-with.htmltag:blogger.com,1999:blog-23021255.post-12481176417514165042013-05-24T07:18:00.000+02:002013-05-28T12:31:18.944+02:00<p>It took years before the rumored Cisco vSwitch materialized (in form of <a href="http://blog.ioshints.info/2011/06/what-exactly-is-nexus-1000v.html">Nexus 1000V</a>), several more years before there was the first competitor (<a href="http://blog.ioshints.info/2012/02/ibm-launched-nexus-1000v-competitor.html">IBM Distributed Virtual Switch</a>), and who knows how long before the third entrant (<a href="http://blog.ioshints.info/2013/05/interop-product-launch-craze.html">recently announced HP vSwitch</a>) jumps out of PowerPoint slides and whitepapers into the real world. </p><p>Compare that to the Hyper-V environment, where we have at least two virtual switches (<a href="http://www.cisco.com/en/US/products/ps13056/index.html">Nexus 1000V</a> and <a href="http://blog.ioshints.info/2013/01/nec-launched-virtual-openflow-switch.html">NEC&#39;s PF1000</a>) mere months after Hyper-V&#39;s general availability.</p><a href="http://blog.ioshints.info/2013/05/hyper-v-30-extensible-virtual-switch.html#more">Read more ...</a><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=qFn1WiRvCTo:oaQpp3OS-0Q:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=qFn1WiRvCTo:oaQpp3OS-0Q:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=qFn1WiRvCTo:oaQpp3OS-0Q:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=qFn1WiRvCTo:oaQpp3OS-0Q:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=qFn1WiRvCTo:oaQpp3OS-0Q:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=qFn1WiRvCTo:oaQpp3OS-0Q:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=qFn1WiRvCTo:oaQpp3OS-0Q:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=qFn1WiRvCTo:oaQpp3OS-0Q:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=qFn1WiRvCTo:oaQpp3OS-0Q:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/qFn1WiRvCTo" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com7http://blog.ioshints.info/2013/05/hyper-v-30-extensible-virtual-switch.htmltag:blogger.com,1999:blog-23021255.post-84817428115034816402013-05-23T07:07:00.000+02:002013-05-23T07:07:00.047+02:00<p>The OpenFlow zealots are quick to point out the beauties of the centralized control plane, and the huge savings you can expect from using commodity hardware and open-source software. What they usually forget to tell you is that you also have to reinvent all the wheels the networking industry has invented in the last 30 years.</p><a href="http://blog.ioshints.info/2013/05/openflow-and-sdn-do-you-want-to-build.html#more">Read more ...</a><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=tf1Cufgb1Ic:RL4DrIQB2HI:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=tf1Cufgb1Ic:RL4DrIQB2HI:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=tf1Cufgb1Ic:RL4DrIQB2HI:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=tf1Cufgb1Ic:RL4DrIQB2HI:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=tf1Cufgb1Ic:RL4DrIQB2HI:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=tf1Cufgb1Ic:RL4DrIQB2HI:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=tf1Cufgb1Ic:RL4DrIQB2HI:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=tf1Cufgb1Ic:RL4DrIQB2HI:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=tf1Cufgb1Ic:RL4DrIQB2HI:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/tf1Cufgb1Ic" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com0http://blog.ioshints.info/2013/05/openflow-and-sdn-do-you-want-to-build.htmltag:blogger.com,1999:blog-23021255.post-23402365979009454082013-05-22T10:22:00.000+02:002013-05-22T11:05:01.519+02:00<p>Did you know <a href="https://www.parc.com/event/1912/bob-metcalfe-leads-a-celebration-of-40-years-of-ethernet-innovation.html">Ethernet turned 40 today</a>? I didn't (I was never good at tracking anniversaries), but <a href="http://www.linkedin.com/in/krisamundson">Kris Amundson</a> (the engineer keeping his network up and running in pitch dark Antarctica) quickly brought it to my attention with wonderful photos of South Pole Ethernet network built @ -69C (that's -92F if you're still ignoring the metric system).</p><div class='separator'><a href="http://4.bp.blogspot.com/-3jw0G1JksGw/UZx_Mt9oblI/AAAAAAAAFyw/hO_JF7R4wFg/s1600/dsc_2078.jpg" imageanchor="1" ><img border="0" src="http://4.bp.blogspot.com/-3jw0G1JksGw/UZx_Mt9oblI/AAAAAAAAFyw/hO_JF7R4wFg/s320/dsc_2078.jpg" /></a></div><p>Even better, they still have a thick coax cable with transceiver screwed into it!</p><div class='separator'><a href="http://1.bp.blogspot.com/-mW_akM7B9Ag/UZx_adtV4kI/AAAAAAAAFy4/yYlUZ2ItA8E/s1600/dsc_2128.jpg" imageanchor="1" ><img border="0" src="http://1.bp.blogspot.com/-mW_akM7B9Ag/UZx_adtV4kI/AAAAAAAAFy4/yYlUZ2ItA8E/s320/dsc_2128.jpg" /></a></div><p>Thanks for sharing, Kris! Really appreciated ;)</p><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=gFIyX6LybYg:q5u9Bi9NtAw:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=gFIyX6LybYg:q5u9Bi9NtAw:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=gFIyX6LybYg:q5u9Bi9NtAw:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=gFIyX6LybYg:q5u9Bi9NtAw:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=gFIyX6LybYg:q5u9Bi9NtAw:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=gFIyX6LybYg:q5u9Bi9NtAw:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=gFIyX6LybYg:q5u9Bi9NtAw:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=gFIyX6LybYg:q5u9Bi9NtAw:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=gFIyX6LybYg:q5u9Bi9NtAw:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/gFIyX6LybYg" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com3http://blog.ioshints.info/2013/05/celebrating-40-years-of-ethernet-at.htmltag:blogger.com,1999:blog-23021255.post-28472339504794427292013-05-22T06:45:00.000+02:002013-05-22T06:45:01.028+02:00<p>I was sitting next to a really nice security engineer during the fantastic dinner-in-a-wine-cellar @ <a href="http://blog.ioshints.info/2013/05/troopers-13-must-visit-security.html">Troopers 13</a> and as we started talking about security implications of ignoring IPv6, I was quickly able to persuade him that it&#39;s dangerous to pretend IPv6 doesn&#39;t exist and that even though you might choose not to deploy it, you still have to acknowledge it exists and take protective measures.</p><p class="note">It’s always great fun to explain the dangers of ignoring IPv6 to a networking or security audience, and see some people muttering “oh, ****”</p><a href="http://blog.ioshints.info/2013/05/the-dangers-of-ignoring-ipv6.html#more">Read more ...</a><div class="blogger-post-footer"><br />Have you already subscribed to my podcast (or is it screencast)? It's easy, just <a href="http://feeds.feedburner.com/ipspace">click here</a>.</div><div class="feedflare"> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=0hOGy93fLZM:Ly_J_4X0mYM:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=yIl2AUoC8zA" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=0hOGy93fLZM:Ly_J_4X0mYM:qj6IDK7rITs"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=qj6IDK7rITs" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=0hOGy93fLZM:Ly_J_4X0mYM:I9og5sOYxJI"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?d=I9og5sOYxJI" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=0hOGy93fLZM:Ly_J_4X0mYM:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=0hOGy93fLZM:Ly_J_4X0mYM:F7zBnMyn0Lo" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=0hOGy93fLZM:Ly_J_4X0mYM:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=0hOGy93fLZM:Ly_J_4X0mYM:V_sGLiPBpWU" border="0"></img></a> <a href="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?a=0hOGy93fLZM:Ly_J_4X0mYM:4cEx4HpKnUU"><img src="http://feeds.feedburner.com/~ff/CiscoIosHintsAndTricks?i=0hOGy93fLZM:Ly_J_4X0mYM:4cEx4HpKnUU" border="0"></img></a> </div><img src="http://feeds.feedburner.com/~r/CiscoIosHintsAndTricks/~4/0hOGy93fLZM" height="1" width="1"/>Ivan Pepelnjakhttps://plus.google.com/103244604531451267644noreply@blogger.com0http://blog.ioshints.info/2013/05/the-dangers-of-ignoring-ipv6.html