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Ivan Pepelnjak brings many years of internetworking experience and broad technical knowledge to his ipspace.net blog.  He cut his teeth as a programmer before getting the network bug. 


He’s written several popular books for Cisco Press, and in addition to his day job as Chief Technical Advisor to NIL Data Communications, he scratches his CLI itch with ninja consulting gigs and hosts deep-dive technical workshops for IT.  I learned more about real-world IPv6 from his blog than any other single source, and his daily updates are part of my morning reading list.


Connect with Ivan:

URL: http://www.ipspace.net

Twitter handle: @ioshints
PH: What’s the address of your blog?


IP: http://blog.ioshints.info/


PH: What do you blog about?


IP: I’m focusing on advanced networking technologies, which currently means data center networking and large-scale virtual networks. I covered a lot of IPv6 topics in the last few years, but that protocol should be well understood by now (at least by those that are interested in the future of Internet), so the number of IPv6 posts on my blog has been steadily dropping.


PH: Why did you decide to start the blog?


IP: I always wanted to explain how interesting but rarely used features in Cisco IOS work, and blog seemed to be a perfect format. My readers slowly pulled me into other interesting directions, so the blog posts became truly multi-vendor and now focus more on emerging technologies and design issues than features of a particular networking software.


PH: What are some of your most popular posts?


IP: Introductory level essentials I wrote years ago are still getting the most page views. The two most-popular posts are default username on Cisco routers and BGP AS path prepending. However, I prefer to judge the quality of my posts by the interactions and responses they generate, not by the number of random page views (usually caused by Google’s search results). Blog posts from 2012 that generated copious reader responses described the new networking features of Hyper-V, virtual firewalls, and Juniper’s QFabric ... but the absolute winners were those that documented the perils of large layer-2 domains and spanning tree problems, obviously two of the most pressing real-life problems faced by data center networking engineers.


PH: What is your day job?


IP: It seems like blogging and webinars became a large portion of my day job in the recent years, but in real life I’m still Chief Technology Advisor @ NIL Data Communications, a European system integration, professional services and training company.


PH: What are your hobbies?


IP: Rock climbing, mountain biking and woodworking.


Other recent blogger profiles:

Ryan Adzima, The Techvangelist

Bill Brenner, Salted Hash

Tom Hollingsworth , The Networking Nerd

Scott Lowe, blog.scottlowe.org

Matt Simmons, Standalone SysAdmin