Hi
How are you networking?
Are you using a hub? or connecting them to each other? if the latter, you need a crossover cable rather than a normal network cable
Check their IP addresses, they should be set to be using the same subnet
i.e. if the subnet mask is 255.255.255.0 then the first three octets of the IP address should be the same i.e. 192.168.0.X
X being any number from 1 to 254
Let me know as much info as possible and your level of knowledge, and I'll try to help more
EGLD