help me about adsl

[wayne]

i have setup two linux servers,one is used debian 2.2 r2,the other is redhat 
7.1,but both of two servers display a same problem,when i use rp-pppoe,it 
display connected,but i can not get reply from any internet ip address,also i 
have no dns,but when i use adsl-setup,i type the dns server.the server is 
compaq Ml350,i use 3com 3c905b for pppoe connection.please help me resolve this 
problem.thanks a lot.