Introduction to OpenFlow

Ah - I can finally breathe a sigh of relief, for I am finally done with my Senior Design sequence, as well as my undergraduate education. I’ve been feeling a little out of place, actually, since I’ve been in research mode for the last 9 months for my IPv6 project. So, after a short break, I decided to get back into things that I was just getting started with before all of that started.

Next Generation Mesh Networks


The proper design of a network infrastructure should allow for a number of key traits that are very desirable in an overall network design. First, the infrastructure needs to provide redundancy and resiliency without a single point of failure. Second, the infrastructure must be scalable in both geographic reach as well as bandwidth and throughput capacity.

Ideally, as one facet of the network is improved, such as resiliency; it should also improve on bandwidth and throughput capacity as well. Certain technologies work on the premise of an active/standby method. In this manner, there is one primary active link – all other links are in a standby state that will only become active upon the primary links failure. Examples of this kind of approach are 802.1d spanning tree and its descendants rapid and multiple spanning trees in the layer 2 domain and non-equal cost distance vector routing technologies such as RIP.

While these technologies do provide resiliency and redundancy they do so at the assumption that half of the network infrastructure is unusable and that a state of failure needs to occur in order to leverage those resources. As a result, it becomes highly desirable to implement active/active resiliency Continue reading

The Importance of Networking

Networking is constantly being promoted throughout a huge range of industries, and is generally being seen as more valuable than ever before. However, all too often, it can be swept under the carpet. Those of us who work with technical industries can be particularly prone to not making the most of our networking opportunities. However, […]

World IPv6 Day: What It Is and What You Should Do

Arguably the most important day for IPv6 since it was created is World IPv6 Day, which falls on June 8th, 2010. This has been a highly publicized day when the top internet content providers like Google, Facebook, and Yahoo provide native IPv6 DNS records to their sites. But what does this mean? And how can you be prepared? Most of all, what will break, if anything? What will happen on World IPv6 Day?

OSPF on CE-PE links

A pretty long post that summarizes the characteristics of OSPF protocol when using it on a CE-PE link. Read along to review its features, learn about BGP extended communities and loop prevention mechanisms for OSPF on CE-PE links.

New Blog Location / IPv6 Hacking – “thc-ipv6” [Part 1]

I’m pleased to announce the first post in my blog’s new location, here at I have been running a casual blog from my house for the past two years with mixed success. Residential internet connections as they are, this was usually hit or miss regarding whether or not my blog was even reachable. I’ve moved all that content to a web host which should prove to be much more reliable.

Matching packets based on their size

Welcome on my very first post on my new fresh technical blog!
This post shows different ways of how to match packets based on their length. While this may not be very common in real production, you will find it useful during your CCIE preparations.