What are we talking about? Wireless network i assume?
You could set up both of them identically. So the same network name, and the same protocol (A,B,G,N) but different channels. Your wireless network card should roam between the two then.
Don't want to hijack the thread but I'm having a similar problem. I purchased a new router to extend the coverage in my house and I still have the old one collecting dust. The back of the house still has dead spots. I tried plugging in the old router in the back of the house and all it did was make my phone service stop working.
Is it possible to make my old router into a wireless extender of my network without a cable hooking it to the main router?
Uhmm ok. This should be good. You need to figure out the ip address of both the routers. It depends on how you've set them up. Could you post an ipconfig excerpt of your network card when you're connected to either of the networks?
They usually have a web interface through which you can configure stuff. So you need to know the ip address of both. And they're unique. So they can't both be 192.168.2.2.

