All you should need to do is set the PC's default gateway to the IP address you assigned to your second NIC.
in this way the PC sends its data to the Mac, which then relays it up through your DSL connection.
The two NICs on the Macs should have different IP addresses and subnet masks. For example, if you're using 192.168.1.x on your existing DSL network, use 10.1.x.x on your second nic.
in this way the PC sends its data to the Mac, which then relays it up through your DSL connection.
The two NICs on the Macs should have different IP addresses and subnet masks. For example, if you're using 192.168.1.x on your existing DSL network, use 10.1.x.x on your second nic.