Comment 8 for bug 312104

I'd like to confirm this on my end as well. Upgrade from Intrepid 64bit->Jaunty exhibits this behavior.

Console tools like ping or links work. Some do not however: notably aptitude and apt-get. My workaround for the apt-get/aptitude issue was to add the ips to us.archive.ubuntu.com and security.ubuntu.com to my /etc/hosts.

Firefox will not work unless network.dns.disableIPv6 is set to TRUE even though I have ipv6 connectivity so it seems its a dns specific issue.

A workaround I have been doing is to add my name servers to /etc/resolv.conf which fixes the issue for all applications but this is sub-optimal as whenever the system releases it's ip I need to readd these servers.

Formerly, having my router supply the dns servers has worked fine (including for ipv6 access) so it seems something peculiar is happening.