Wireless G and Wireless N Simultaneously
 

How do I run 2 different routers (both DD-WRT), one in Wireless G and the other in Wireless N mode under the same network?

I understand that I can run the N-router in mixed mode, but running a router strictly in N-mode is faster. I also have an old G-router kicking around, so I thought I'd set them up together.

The two routers will be next to each other connected with a ethernet cable.

Just use different ssids and channels. But unless you're moving massive files over wireless there's not much benefit.