iamcal.com

IPv6 and DNS Round Robin

nobody@domain.com (Cal Henderson) — Tue, 10 Jul 2012 20:31:00 +0000

If your application uses getaddrinfo instead of gethostbyname (for IPv6), DNS round robin will not work. Urgh. Recently found this as the cause of our Java app only connecting to half of the hosts in our AWS ELB.

10th March, 6:30 am

nobody@domain.com (Cal Henderson) — Thu, 10 Mar 2011 06:30:00 +0000

dns prefetch can be a big deal for sites that give a subdomain per user

13th September, 6:20 am

nobody@domain.com (Cal Henderson) — Mon, 13 Sep 2010 06:20:00 +0000

i can never find the dnslint tool that i really liked, but the opendns cache tool is a bit useful

30th June, 10:36 pm

nobody@domain.com (Cal Henderson) — Mon, 30 Jun 2008 22:36:00 +0000

some guys i know had some DNS issues when they switched servers. turns out you need to open port 53 for TCP aswell as UDP. who knew? some details here

24th November, 3:59 am

nobody@domain.com (Cal Henderson) — Thu, 24 Nov 2005 03:59:00 +0000

a couple of great articles on the issues involved with gslb. if anyone has any idea how akamai's freeflow/edgesuite claims to provide dc failover in around a minute i'd live to know - dns trickery or route convergence?

11th April, 5:32 pm

nobody@domain.com (Cal Henderson) — Mon, 11 Apr 2005 17:32:00 +0000

of course, someone has already set up a public portal and dns server to help you avoid the hard part of setting it up.

13th July, 11:08 pm

nobody@domain.com (Cal Henderson) — Tue, 13 Jul 2004 23:08:00 +0000

good news via salt: verisign to stop being so shit and update atlas once every 5 minutes instead of 12 hours.