Use wireless router with existing network and switch?

I have an existing network using a T1 into a switch; all the computers and the server are connected to the switch. Some distance away, via ethernet cable to the switch, I would like to connect a wireless router, one computer wired to that router, and other computers connect via wireless. Our server provides DHCP. Is this possible? How best to do it? Which Linksys router would be best for the purpose? Thanks for the help!

The "correct" device to use would be a wireless access point like the Linksys WAPs and not a WRT router. WRT routers are supposed to connect to the internet on its own.
You can set up a WRT router as simple access point. see here for the setup.
The best router is the one which best suits your needs. All wireless routers and access point provide wireless access. It depends on what you want (802.11n, 11b, 11g, range, speed, etc.). The newer routers are better from the specifications but usually also have more firmware bugs. But that's pretty much all one can say based on your generic requirements.

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