networking!!!!!

I installed linux 7.3, I am trying to configure my network, I did so under my win box, and I can see internet, but I am using the same parameters under linux and all the hosts are unreachable.... please please what am I doinmg wrogn, I poi I ping my self and ok, I try to ping any where else outside and no does not work,.... but I am using the SAME parameters that I have under windows and under win98 it works fine!!! please