Cannot Surf Internet, but I can Ping

[Kevin Purcell]

Just installed Ubuntu and am having the following problem.

I opened Firefox and could not surf.  I entered my router's address and it
is connected to the Internet.  So I tried pinging it and it sees the router
and my network storage device.  So the network works.  I then tried pining
(in terminal) the address of my ISP listed in the status page of my Linksys
Router (it is a WRT54G).  It pinged okay without any packet loss.  A little
slower than in Windows, but at least it works. Don't know any other Internet
numeral addresses, so don't know if I can ping anything other than my ISP.
I tired pinging yahoo.com and google.com and microsoft.com and all failed.

Any idea how to fix this?

Thanks

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Version: 7.1.375 / Virus Database: 267.14.22/239 - Release Date: 1/24/2006