DHCP Option 43 Generator for Cisco Lightweight APs

I got lazy after having to create a load of DHCP scopes for Cisco Lightweight Access Points, each requiring Option 43 in TLV format. And now you can be lazy too. Save the following as a HTML file and open in your favorite browser. In the text area enter your WLC IP addresses one per line and hit submit. This will generate the hex string to use in DHCP Option 43.

loadbalancer.org Linux Feedback Agent

I’ve been working with some loadbalancer.org appliances recently, load balancing traffic over MySQL and Apache servers running Linux. The load balancer supports a feedback agent where it can query the real server to gauge how utilised it is based on, for example, CPU load and then distribute the request to the real server that should perform the best. Over on the loadbalancer.org blog is an article about the feedback agent and how to implement it

Cisco VSS, Domain ID and Virtual MAC Addresses

The other weekend I connected a L2 circuit between two sites. At both ends were Cisco 6500 Catalyst switches running VSS. The interfaces they connected to were configured as L3 and EIGRP was run between the two sites to share routes. But as soon as they were connected the neighbors started flapping. Troubleshooting started and as always you start at the lowest OSI layer and work up. Bingo! The issue