Just finished watching a Google Tech Talk on Bonjour presented by Dr. Stuart Cheshire. It’s a very simple introduction to Apple’s implementation of zeroconf. Bonjour aka Zeroconf aka Avahi isn’t the evil I thought it was; and I don’t know why I assumed it was evil. I guess it’s a mixture of hating that Avahi is on by default in most RH-based distros coupled with my misconception that bonjour was appletalk rebranded. Appletalk had a reputation for being chatty so I just assumed bonjour inherited that gene. Truth is bonjour doesn’t introduce any non-standard whiz-bang...

I wanted to use a DynDNS address with iptables. Obviously, you need a way to update the iptables rules when the IP of the dyndns address changes. Easiest solution is to cron a script that updates iptables when the IP changes. Here is one such script: