I have worked on /etc/network/interfaces and so will check to see if I messed up there.
> Hi There,
> I had to reinstall Debian from my cd-rom. In the earlier install (from the
> same cd-rom), I could connect to the Internet through my Windows XP laptop
> with no problem. They are connected by a Cat5 Crossover cable between their
> Ethernet cards. Now, after the reinstall, I cannot connect to the outside
> world from my Debian system. I pinged each system from the other and the
> Ethernet connection is good. I tried to use apt-get update and the error
> message said that apt could not resolve the name of the destination computer
> to get the updates. I connected to the destination computer with the laptop
> easily so it is there and running.
Have you configured your nameserver and/or gateway and/or proxy correctly?
I need no proxy myself so I don't know in which file to set it up.