First-Hop IPv6 Security Features in Cisco IOS

I wanted to figure out how to use IPv6 DAD proxy in PVLAN environments during my seaside vacations, and as I had no regular Internet access ...

VRRP, Anycasts, Fabrics and Optimal Forwarding

The Optimal L3 Forwarding with VARP/VRRP post generated numerous comments, ranging from technical questions about VARP (more about that in ...

VLANs are the wrong abstraction for virtual networking

Are you old enough to remember the days when operating systems had no file system? Fortunately I never had to deal with storing files on one...

Where is my VLAN provisioning application?

Yesterday I wrote that it’s pretty easy to develop a VLAN provisioning application (integrating it with vCenter or System Center earns you ...

What did you do to get rid of manual VLAN provisioning?

I love listening to the Packet Pushers (the best networking podcast there is) on my way to work, and I know what to expect in every SDN-focu...

IPv6 Secure Neighbor Discovery (SEND)

During the IPv6 Security webinar Eric Vyncke explained the intricate details of IPv6 Security Neighbor Discovery (SEND) and the reasons it...

VXLAN and OTV: I’ve been suckered

When VXLAN came out a year ago, a lot of us looked at the packet format and wondered why Cisco and VMware decided to use UDP instead of more...

QFabric Lite

QFabric from Juniper is probably the best data center fabric architecture (not implementation) I’ve seen so far – single management plane, i...

Virtual Networking is more than VMs and VLAN duct tape

VMware has a fantastic-looking cloud provisioning tool – vCloud director . It allows cloud tenants to deploy their VMs and create new virtua...