IPv6 Anycast

IPv6 has a neat feature called Duplicate Address Detection (DAD). When you add an IPv6 address to an interface, it checks to be sure that nobody else is already using that address. That's a Good Thing®. But if you're using IPv6 addresses for anycast and two (or more) devices are on the same subnet it can cause problems. The solution is to not put your anycasted addresses on the shared interface (e.g. eth0); rather, put them on the loopback interface.


Asterisk Experiment: IPv6 and TCP

I couldn't tell you how long these features have been in Asterisk but I decided to give IPv6 and SIP/TCP a try in the latest 1.8 release. Basically it's a simple process. There are no special options required in the build, not that I could find anyway.

Once it's installed, there are two configuration options that need to be set. By default Asterisk will only listen on IPv4 and UDP so add these options in sip.conf:


World IPv6 Day Wrap-up

Looks like World IPv6 Day was a good success. I saw a lot of traffic on NANOG announcing various issues people had seen, and many people declaring success. My own little fiefdom experienced relatively few problems. My Linux laptop had no issues with Google, Facebook and the other sites I could find. I reset my traffic counters this morning so I could watch it:


Presenting at UTOSC 2009

I will be presenting at the Utah Open Source Conference (UTOSC) again this year. On tap are 3, count 'em, 3 presentations. I'm still not quite sure what possessed me to submit 3 abstracts but I did and (just to spite me I think) they accepted all of them.

Refer to the schedule for any last minute changes but for now here are the times I'm speaking.

Hope to see you there.


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