Can't find server with internet connection.

I have dsl and trying to connect two computers via ethernet. I have both 9.2's connected via ethernet but when I go to the OSX system and set up I get a can't find server message. I know I have connectivity with the modum because I can operate in Classic. I have followed all the ISP instructions using the DHCP ethernet settings in the network mode but no internet connection via the dsl. I pinged this and get a response through an IP address but when I add an address like yahoo.com it comes back with can't find server. Not a clue what is wrong here?