What are Ethernet, IP and TCP Headers in Wireshark Captures

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If I could go back in time when I was a n00b kid wanting to go from zero to a million in networking, the one thing I would change would be spending about 6 months on the fundamentals of networking headers and framing before ever touching a single peice of vendor gear. Ethernet, IP and Transport headers (L2-L4) are the …

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Why the NOS will decouple

Over the next couple of years some of us expect the networking industry to have some fairly significant changes. There are really two options: A distributed approach we have today or a controller based centralized model. We  have today just that, autonomous devices building adjacencies to one another, exchanging what it hopes are the best healthy paths to send next hop traffic …

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Network Processor Units (NPU) FTW

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OTV configuration notes

Quick notes on OTV. I have not put this on lab gear yet so there may be typos. It does require licensing so make sure you have that budgeted, if not its a 20kish surprise which sucks.

#The Overlay interface ID (int overlay1) must match at both sites. A Vlan can only be assigned to one overlay.

#Join-interface. From …

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February 2012 SDN Thoughts

I commented on a blog post earlier and I am recording my updated thoughts to review over the next few years to see how wrong I was. My initial business cases still have not changed much from 4 months ago. It has always been and will be about money. What will drive this is the ability to commoditize networking vendors and level …

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OpenVswitch and GRE tunnel notes

Open Vswitch Lab

Here is a quick post for setting up GRE tunnels on OpenVswitch. Both Vswitch boxes are attached to an OpenFlow Beacon controller. More up to date how-to can be found here: Configuring VXLan and GRE tunnels on OpenvSwitch KVM live storage migration makes an interesting story and run at VMware tools. The dreaded layer2 data center link conversation may never …

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Installing Open vSwitch with KVM

This tutorial is for installing Open vSwitch with KVM in order to replace traditional hypervisor Ethernet switching using Linux bridging with Open vSwitch. I rebuilt this box becuase as fun as it was to setup OpenStack (I think) there are a million modules that would take more time to clip out rather than just rebuilding. Anyone gotten Nova integrated into …

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OpenStack on Ubuntu 11.10 Installation

My notes from an OpenStack & Ubuntu 11.10. These are only my notes. Lots of errors. It was a fairly painless install. I didnt have the lab gear setup with two Nics so I got a bit kludgy at the end. I think the interesting component will be to replace the Openstack bridging with OpenVswitch. sudo apt-get install rabbitmq-server sudo …

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