where to put the ADSL cable

Hi everyone. 18 computer Samba network under SuSE 7.3. 3Com ADSL router. Works great on a single computer but when we put it in our hub we get nothing apart from the server being able to use the internet. We have placed a second ethernet card in the server. The server is 192.168.0.1 and eth1 in the same machine at 192.168.0.22. The gateway is 192.168.0.4. We can ping all the machines and Samba can see all the clients shares and vica versa. We have tried with and without squid and we are using the nameservers given by the 3Com guys. There are no firewalls to get in the way yet either. Any help anyone? Thanks, Steve.