It all begins after the first update of a fresh ubuntu 9.10 install. Everytime I opened a browser and go any website, it takes 5-10 seconds for it to resolve the DNS. This applies to both Chrome and Firefox. I did tons of research on the internet. Lots of people concluded it is caused by the new DNS mechanism in Firefox 3.5. In this version, Firefox tend to use ipv6 to resolve DNS at first. Then after 3 failures, it will start to use ipv4. So people suggested to config firefox so that ipv6 is disabled. Also, some others suggested this is not enough, an update on the Grub to completely block ipv6 is necessary. I tried both, but neither of them solves the issue.
By "time dig www.google.ca", it still takes nearly 5 sec to "looking for host".
Then I read this:
http://www.unixmen.com/linux-tutorials/567-internet-connexion-is-very-slow-on-karmic-koala-solution-
By manually specifying DNS address (I got it from my router's config, do not use your router as the DNS server), the issue is solved.
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