Join Date: Dec 2009
Location: San Francisco Bay Area
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first, what is suggested will not work. The Diasy Chain idea, as explain will cause double NATing, and thus not work the way your intend.
It's possible to do, but you need different equipment. To have two different networks, you'll need more powerful software/firmware. Maybe DDWRT or Tomato may work; you'd have to research if your modem was compatible and if there firmware/software supported it. You could go with something like Untangle, Smoothwall, PfSense and so on, but you'll need a space PC and additiion NICs to do it. I personally do this in my LAN, but for different because of my own online paranoia.
I'm not exactly sure what exactly your trying to achieve. You're trying to do things: more range, but separate networks for N and G. Depending the on the router, you can create separate SSID networks for N versus G, such as the DLink 655. If you have these two routes already, you could just bridge one router into the other. This will allow to have two separate SSIDs, but you're still on the network like 18.104.22.168. Your just going to assign on router an IP outside the one that actually doing the routing; you're turning the machine into a wireless access point.
For more range, you can look into getting larger antennas if your router allows you to replace them. This can range from about twenty dollars to hundreds of dollars. You can literally set it up to be able to broadcast your neighborhood you're willing to spend the money. The option, put in some repeaters. They're essentially just wireless access points. I haven't looked into getting one myself, but they're may be some that can support more than one SSID/network.
End of the day, you may not have to do all that. Depending on what your house is made out of and location, you may be able to get good signal throughout the whole house. I live in small home, just 1300 square feet. My wireless points at the front of the house. I get signal about halfway through our large backyard. The signal has to travel through several walls and a kitchen. I probably get more range if I had them high on the wall instead mounted under a desk.