Now, I should mention I've set this up and it does work but it bugs me that I don't understand completely why.
I have a router/modem (all in one) that controls most of the computers here and then a cable from the LAN on the modem/router going to a different router on a different subnet (plugging into the WAN port on this separate router).
The first network (router/modem) is on 192.168.1.1
the second network (router alone) is on 192.168.0.1
Both have DHCP on, and the second router automatically sees the first as a DNS server and everything works.
Is this the proper setup, or can it create conflict/problems down the line? My goal is to keep both networks from communicating with each other while allowing both an internet connection. Thanks!