Network 2.0: Virtualization without Limits
So the theme of the day is Network Virtualization, Software defined networks and taking virtualization to its logical conclusion i.e. server, storage and network in a giant resource pool that can be allocated/assigned any which way. Although its easier said then done. Server and Storage virtualization were a bit simpler since we were dealing with one OS that needed to provide the right abstraction layer. The H/W resource pool (disk, cpu, network, memory, etc) was managed by the single OS so provisioning it between various virtual machines or storage pool was a bit simpler. The network by definition is useful only when multiple devices are connected and trying to treat them as a single resource pool is harder. A virtual networks has to deal with not just links, bandwidth, latency and queues but also
higher level functionality like routing, load balancing, firewalling, DNS, DHCP, VPN, etc. etc. And we haven’t even talked about how this all will hook up together along with virtual machines and virtual storage pool in a easy manner. Now before you argue that every component is already virtualized (which is very true), one could argue that it still doesn’t give me a virtual network. It Continue reading
Net-SNMP 5.6.1 Missing hrSystemProcesses OID
I just upgraded a couple of machines to OpenBSD 4.9 and noticed the hrSystemProcesses OID was not being returned by Net-SNMP 5.6.1 (from the 4.9 ports/packages collection) . joel@theta:~% snmpwalk -v2c -c public theta .1.3.6.1.2.1.25.1.6.0 SNMPv2-SMI::mib-2.25.1.6.0 = No Such Instance currently exists at this OID I know for sure this worked on OpenBSD 4.8/Net-SNMP 5.4.2.1. Turns out there is a bug in Net-SNMP 5.6.1 (bug 3166568) that's causing this. It's been fixed in their SVN tree.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.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, […]Junoshere. For the masses?
It is amazing how sleepy you feel when sitting in a relatively dark auditorium after a buffet lunch. I sat through a presentation on Junosphere which looked fantastic and just what the community has been crying out for so we … Continue reading
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?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 keepingitclassless.net. 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.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 keepingitclassless.net. 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.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 keepingitclassless.net. 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.Difference for PORTFAST & BPDUFILTER used globally or at interface-level
Portfast + bpdufilter (used together) can be enabled globally or at interface level.
Although the first impression is that the only difference is the global or per-interface effect, this is not entirely true and another subtle and important difference is described in this post.
How to recover Cisco IOS from rommon
Thought I would add this to my blog to help anyone that was in the same situation I had back in April. A big thanks to Richard Morrell ( @richardmorrell ) for this! If you have a Cisco router which … Continue reading
Debunking the IPv6 Has More Security and QoS Myths
I thought that in the year 2011 …when the we’ve had so much talk about IPv6, lots of the smoke about what IPv6 is capable of and what it isn’t capable of would have cleared. Unfortunately not. Today I read this … Continue reading
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.
OpenBSD 4.9 SNMP MIBs
I've updated my SNMP MIBs to support OpenBSD 4.9.