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Category Archives for "Networking"

OpenBSD 5.0 SNMP MIBs

The OpenBSD SNMP MIBs are now updated to compile under OpenBSD 5.0. Full details of how to install and use the MIBs are on the SNMP MIBs page. There is no functional change in this release. Download: obsd-mibs50.tar As usual, if you find OpenBSD valuable, please make a donation to the project as they are dependent upon donations to cover many of their costs.

OpenFlow Symposium 2011 – Morning Session

I was able to watch a good chunk of the morning session of the OpenFlow Symposium in San Jose. The stream was having issues at the beginning of the afternoon session, plus I was pulled away for other issues, so I was only able to watch the morning session. I’d like to provide a bit of a write-up from what I was able to catch, and point out some of the highlights that I took interest in from the day’s speakers.

OpenFlow Symposium 2011 – Morning Session

I was able to watch a good chunk of the morning session of the OpenFlow Symposium in San Jose. The stream was having issues at the beginning of the afternoon session, plus I was pulled away for other issues, so I was only able to watch the morning session. I’d like to provide a bit of a write-up from what I was able to catch, and point out some of the highlights that I took interest in from the day’s speakers.

OpenFlow Symposium 2011 – Morning Session

I was able to watch a good chunk of the morning session of the OpenFlow Symposium in San Jose. The stream was having issues at the beginning of the afternoon session, plus I was pulled away for other issues, so I was only able to watch the morning session. I’d like to provide a bit of a write-up from what I was able to catch, and point out some of the highlights that I took interest in from the day’s speakers.

Link-State vs. Distance Vector – The Lowdown

I’ve been trying to get more into networking message boards like Networking Forum and TechExams.net lately. It’s a great way to get in touch with fellow packet lovers and gain some interesting perspectives along the way. In fact, it’s great for anyone in networking, whether you’re a hardened veteran or a newbie - there’s usually a place for you in at least one of these sites. As a result, I’ve seen quite a few posts asking about fundamental concepts, which is great because it shows that new networkers are getting out there and learning new things proactively.

Link-State vs. Distance Vector – The Lowdown

I’ve been trying to get more into networking message boards like Networking Forum and TechExams.net lately. It’s a great way to get in touch with fellow packet lovers and gain some interesting perspectives along the way. In fact, it’s great for anyone in networking, whether you’re a hardened veteran or a newbie - there’s usually a place for you in at least one of these sites. As a result, I’ve seen quite a few posts asking about fundamental concepts, which is great because it shows that new networkers are getting out there and learning new things proactively.

Link-State vs. Distance Vector – The Lowdown

I’ve been trying to get more into networking message boards like Networking Forum and TechExams.net lately. It’s a great way to get in touch with fellow packet lovers and gain some interesting perspectives along the way. In fact, it’s great for anyone in networking, whether you’re a hardened veteran or a newbie - there’s usually a place for you in at least one of these sites. As a result, I’ve seen quite a few posts asking about fundamental concepts, which is great because it shows that new networkers are getting out there and learning new things proactively.

Network Humor: Partial Mesh

Partial Mesh [pahr-shuhl mesh] noun A type of networking where each node must not only capture and disseminate its own data, but also serve as a _relay_ for other nodes, that is, it must collaborate to propagate the data in the network. What happens to your screen doors when you get cats Image and definition credit: Wikipedia

Network Humor: Partial Mesh

Partial Mesh [pahr-shuhl mesh] noun A type of networking where each node must not only capture and disseminate its own data, but also serve as a _relay_ for other nodes, that is, it must collaborate to propagate the data in the network. What happens to your screen doors when you get cats Image and definition credit: Wikipedia

BGP between Cisco Nexus and Fortigate

It is not uncommon to find that different vendors have slightly different implementations when it comes to standards technologies that should work seamless. I recently came across a BGP capability negotiation problem between a Nexus 7000 and a client Fortigate. Today’s post is not teaching about any new technologies, but instead showing the troubleshooting methodology […]

Neighbor Solicitation – IPv6’s Replacement for ARP

Like most others that start tinkering with IPv6, I quickly learned that there was no such thing as broadcasts on v6 networks. Since I thought that was a pretty revolutionary concept, I started thinking about all the protocols that until now have relied upon the ability to send via broadcast. The first that came to mind was ARP, which resolves known IP addresses to unknown MAC addresses by sending to the Layer 2 broadcast address of FF:FF:FF:FF:FF:FF.

Neighbor Solicitation – IPv6’s Replacement for ARP

Like most others that start tinkering with IPv6, I quickly learned that there was no such thing as broadcasts on v6 networks. Since I thought that was a pretty revolutionary concept, I started thinking about all the protocols that until now have relied upon the ability to send via broadcast. The first that came to mind was ARP, which resolves known IP addresses to unknown MAC addresses by sending to the Layer 2 broadcast address of FF:FF:FF:FF:FF:FF.

Neighbor Solicitation – IPv6’s Replacement for ARP

Like most others that start tinkering with IPv6, I quickly learned that there was no such thing as broadcasts on v6 networks. Since I thought that was a pretty revolutionary concept, I started thinking about all the protocols that until now have relied upon the ability to send via broadcast. The first that came to mind was ARP, which resolves known IP addresses to unknown MAC addresses by sending to the Layer 2 broadcast address of FF:FF:FF:FF:FF:FF.

Virtual Switching System (VSS) on Cisco Catalyst 6500

I’m currently working on a project that, among other things, involves the installation of two Catalyst 6509 switches. I was recently shown a redundancy feature that I had never heard of before called Virtual Switching System (VSS). The more I looked at it, the cooler it was. The main reason for VSS is something that is typically addressed when there are redundant routing platforms on a network. There are actually quite a few solutions that can be used in the presence of redundant devices, such as the popular and Cisco-proprietary Hot Standby Router Protocol (HSRP), or the IETF open standard Virtual Router Redundancy Protocol (VRRP).

Virtual Switching System (VSS) on Cisco Catalyst 6500

I’m currently working on a project that, among other things, involves the installation of two Catalyst 6509 switches. I was recently shown a redundancy feature that I had never heard of before called Virtual Switching System (VSS). The more I looked at it, the cooler it was. The main reason for VSS is something that is typically addressed when there are redundant routing platforms on a network. There are actually quite a few solutions that can be used in the presence of redundant devices, such as the popular and Cisco-proprietary Hot Standby Router Protocol (HSRP), or the IETF open standard Virtual Router Redundancy Protocol (VRRP).

I Am “Cisco Man”

Hello. Let me begin by saying you have arrived. Pardon me, where are my manners? I am CiscoMan - the comforting presence at the top of a large number of Cisco documents such as configuration and installation notes for Catalyst switches. I’m here to tell you that everything is going to be alright - that it’s okay to be scared. CiscoMan is here to help you out. Believe me, you’re not my first.
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