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If I have a wired network with a DHCP-enabled router, do I need a wireless access point or a router to give wifi access to the office? Do all wifi routers have a mode for reverting to access points if the routing isn't necessary?

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Generally, yes. Most wireless routers will work as wireless access points just the same. You will probably want to disable the DHCP functionality, though, and use a regular LAN port for your upstream connection instead of the WAN port.

How many people are you talking about giving access to? Many consumer-grade wireless routers will start misbehaving after a dozen or two concurrent users.

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"Many consumer-grade wireless routers will start misbehaving after a dozen or two concurrent users" A lot of enterprise grade access points will do the same :) –  Joel Coel Mar 25 '11 at 19:27
    
@Joel So true :-) –  Hyppy Mar 25 '11 at 19:28

What you seems to need is AP. Some wireless routers can act as wireless bridge.

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