Hello. I'm a network illiterate trying to create a home network with a design like the one in the image. And when I say Home I mean also cheap. Cisco might be the perfect solution for network connectivity and world peace, but I can't afford it. As I can't post images, please copy&paste ... h**p://i37.tinypic.com/33cuiys.jpg A, B : RouterB is connected to DSL. Both have wifi enabled and are connected to each other by Ethernet. #1, #2 : Two PCs, #1 connects via wifi and #2 uses Ethernet. #1 can only use DHCP. #3, #4 : Two PCs, #4 connects via wifi and #3 uses Ethernet. My main problem is that the Green group must work always. Group B can go offline at any given time, but #1 must reliably send data to #2 ALWAYS. I can do that just running this Green group isolated from the Red one ... but that means without internet. The problem comes when I try to make the Green group have internet access : If I have to disable DHCP in routerA to let RouterB manage that and be able to get internet connection ... and the routerB goes suddenly offline ... then #1 and #2 can't connect, and I can't let that happen. So ... the way I see it, both groups have to work as independent networks except that Green group must acquire internet connection via RouterB somehow. It would be nice if #1, #2, #3 and #4 could share data, but I'm willing to sacrifice that in order to get a reliable #1 to #2 connection. Well, thats all. That's my question : how do I make it work ?