Comment 89 for bug 417757

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Laurent Bigonville (bigon) wrote : Re: [karmic regression] all network apps / browsers suffer from multi-second delays by default due to IPv6 DNS lookups

This has nothing todo with network-manager or linux kernel. And not even libc as dig doesn't use libc functions to resolve names.

I think that this can be worked around with tweaking /etc/gai.conf or by blacklisting the ipv6 kernel module