Long delay in website loading

[usamahashimi]

Hi
I am having a problem with internet browsing. Whenever I type the address of any webiste like
Google
or
http://www.isohunt.com
or any other, the firefox gives message at "Status Bar" that "Looking up google.com" or "Looking up yahoo.com" etc for every website for about 20-25 seconds and than launches the website successfully. Why this is happening and how can I correct it?
I also tried this in Opera and Google Chrome and same problem occurs in them.
Moreover, if I ping any domain inside terminal, it instantly starts pinging (with ttl 51) and recieving data from that domain resulting that the problem is with browsers.
Thanks

[oz]

Try disabling IPV6 if you haven't done so already.

Hope it helps.