http://www.iamcal.com/ All the links rom iamcal.com 2012-07-10T20:31:00Z http://www.iamcal.com/images/logo.gif http://www.iamcal.com/ http://www.iamcal.com/2012-07/ipv6-and-dns-round-robin/ <p>If your application uses getaddrinfo instead of gethostbyname (for IPv6), DNS round robin <a href="http://daniel.haxx.se/blog/2012/01/03/getaddrinfo-with-round-robin-dns-and-happy-eyeballs/">will not work</a>. Urgh. Recently found this as the cause of our Java app only connecting to half of the hosts in our AWS ELB.</p> 2012-07-10T20:31:00Z Cal Henderson (http://www.iamcal.com/) http://www.iamcal.com/2011-03/2618/ <p>dns prefetch can be a <a href="http://www.pinkbike.com/news/DNS-Prefetching-implications.html">big deal</a> for sites that give a subdomain per user</p> 2011-03-10T06:30:00Z Cal Henderson (http://www.iamcal.com/) http://www.iamcal.com/2010-09/2556/ <p>i can never find the dnslint tool that i really liked, but the opendns <a href="http://www.opendns.com/support/cache/">cache tool</a> is a bit useful</p> 2010-09-13T06:20:00Z Cal Henderson (http://www.iamcal.com/) http://www.iamcal.com/2008-06/1695/ <p>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 <a href="http://tcpmag.com/qanda/article.asp?EditorialsID=339">here</a></p> 2008-06-30T22:36:00Z Cal Henderson (http://www.iamcal.com/) http://www.iamcal.com/2005-11/1102/ <p>a couple of <a href="http://www.tenereillo.com/GSLBPageOfShame.htm">great</a> <a href="http://www.tenereillo.com/GSLBPageOfShameII.htm">articles</a> 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?</p> 2005-11-24T03:59:00Z Cal Henderson (http://www.iamcal.com/) http://www.iamcal.com/2005-04/873/ <p>of course, someone has already set up a <a href="http://www.makeyougohmm.com/20050327/1627/">public portal</a> and dns server to help you avoid the hard part of setting it up.</p> 2005-04-11T17:32:00Z Cal Henderson (http://www.iamcal.com/) http://www.iamcal.com/2004-07/248/ <p>good news via salt: verisign to <a href="http://www.theregister.co.uk/2004/07/13/verisign_dns_update/">stop being so shit</a> and update atlas once every 5 minutes instead of 12 hours.</p> 2004-07-13T23:08:00Z Cal Henderson (http://www.iamcal.com/)