Ivan Pepelnjak

Who’s Who in Virtual Networking: Ivan Pepelnjak

There are plenty of talkers in the social world, but Who’s Who in Virtual Networking — the experts who the experts track to find out what really going on in IT? We’ve scoured the social world to identify the hidden and not-so-hidden opinion shapers and engagers in the world of virtual network services. Each week we’ll profile one of those leaders. This isn’t a list of business leaders or even those with the most followers. Some are well known, but many others are the engineers and architects in the field grappling with the day-to-day issues of IT and virtual network services. What they have in common is a deep understanding of technology and a passion for this virtual world of ours. What’s on their radar screen today, will likely be on your shopping list tomorrow. Without further ado, here’s the first person on our radar.

“Virtual network services are the future of network services due to their flexibility.” – Ivan Pepelnjak

Ivan Pepelnjak

Ivan Pepelnjak

Who is he?

He is currently the chief technology advisor at NIL Data Communications, where he’s focused on advanced IP-based networks and web technologies.

Why we like him:

Always thought-provoking, Ivan gives practical insight into emerging technologies.

Where can you find him?

Read his personal ramblings at his blog, ipSpace.Net and follow him @iosints on Twitter. He’s written several books, including  MPLS and VPN Architectures and EIGRP Network Design Solutions: The Definitive Resource for EIGRP Design, Deployment, and Operation from Cisco Press.

What’s he thinking about?

Overlay virtual networks and virtual appliances. “Virtual network services are the future of network services due to their flexibility,” he says.

What’s he writing about?

We Had SDN in 1993 … and Didn’t Know It

…As I’ve been thinking about controllers, central visibility and network device programmability, it struck me: we already had SDN in 1993.

In 1993 we were (among other things) an Internet Service Provider offering dial-up and leased line Internet access. Being somewhat lazy, we hated typing the same commands in every time we had to provision a new user (in pre-TACACS+ days we had to use local authentication to have autocommand capability for dial-up users) and developed a solution that automatically changed the router configurations after we added a new user. Here’s a high-level diagram of what we did…

Terastream Part 2: Lightweight 4over6 and Network Function Virtualization (NFV)

In the first Terastream blog post I mentioned Deutsche Telekom decided to use an IPv6-only access network. Does that mean they decided to go down the T-Mobile route and deployed NAT64 + 464XLAT? That combo wouldn’t work well for them, and they couldn’t use MAP-E due to lack of IP address space, so they deployed yet another translation mechanism – Lightweight 4over6….

Layer-3 Forwarding with VMware NSX Edge Services Router

The easiest way of connecting overlay virtual networks implemented with VMware NSX for vSphere to the outside world is NSX Edge Services Router. It’s a much improved version of vShield Edge and provides way more than just layer-3 forwarding services – it’s also a firewall, load balancer, DHCP server, DNS forwarder, NAT and VPN termination device…

And outside of work…

Rock climbing!

This is the first profile in a weekly series on the shapers and engagers in the world of virtual network services.