The Initial Problem: I've got a customer who has an existing LAN. He wants to add a public access point in his office. He's a doctor so he can't just let the wireless users have free reign on the LAN, they must only have internet access.

Solution A: Insert a new wireless router between the cable modem and the exisiting router. Then set up the exisisting router as a DMZ host on the new router so any traffic will get passed to it.

The Problem with Solution A: This puts the wireless router in the wrong position physically.

Solution A Revision 2: If a wired router is inserted instead, a wireless access point could be added to it. This has additional costs I would like to avoid.

Solution B: Obtain a second IP address from the cable company and put a switch between the cable modem and the routher. Assign the second IP address to the wireless router. This may be a less costly solution in the long run, but I don't remember how much the cable company charges for additional IP addresses for businesses.

I'd appreciate any additional suggestions.