Using a router as an Access Point

I am going to explain how I Used a WIFI router as an  Access Point on an existing network, I have done this before but didn't have the need for it again until recently. Its a fairly simple procedure but there are 2 major points you must follow in order to achieve success. my main router is a linksys WRT160N, I used a WRT120N as my AP, the first thing you need to do is reassign the IP of the router thats going to be the AP so it doesn't conflict with your router I stayed in the range of my router (If your routers 192.168.0.1 then change it From 192.168.0.1 to 192.168.0.145 any free IP number will work) be sure to write everything down you will need the new IP number to log back in the routers web interface, now you will want to find DHCP server and turn this OFF, now you can set up the wireless to suit your needs, be sure you do not plug your Ethernet cable into the WAN port as we have disabled DHCP and will be using it more as a switch, any of the LAN ports should work. Now if everything is configured correct you should be in business.