Comment 168 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

Well actually it IS an issue with the modem/router.

The previous version of ubuntu (windows and maybe OSX caches dns request or work differently) workaround this router bug. I seems that the workaround was causing other issues (see the 2 bugs mentioned earlier).

Did you try the solutions I proposed yesterday?

> Could you try adding 'options single-request' in /etc/resolv.conf ?

or

> an other option will be to install nscd (apt-get install nscd)

See http://udrepper.livejournal.com/20948.html (DNS NSS improvement paragraph)