You need to connect your DSL modem to a 5port hub at least. 4ports for the computers and 1 for the DSL modem. That's it, just hook up the ethernet wire. Then just configure the ip/gateway/dns setting on all the computers as specified by your dsl provider. You may not have to do this if they run a DHCP server, in that case, you probably just have to plugin and surf. I doubt they are running DHCP.