You even don'nt need two network cards. You can connect your ADSL-modem to a ethernet switch or hub and your PC (one or more) also to this LAN. You connect the modem to one of these PC by starting pppoe on it. If the PC is configured as router other PC on the LAN can use this PC as gateway (and firewall) to the WAN. Regards, Jörg-Volker.