I bought a WRT120N with the intention of connecting wired computers/devices to something which was wirelessly connected to my existing network. My existing wireless router had ethernet ports on it, but it was on the other side of the house.
I spent hours trying to work it out myself, searching the Cisco site and Googling for an answer. I'm no wireless guru but I was starting to feel really dumb. Finally, I got onto the live chat on the Cisco site. I should have done this at the start. From the previous posts, I'm guessing the phone support isn't that great, but this online chat was fantastic - drilled right down to the problem very quickly. Here's a cutdown of the conversation...
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[2012-04-27 06:36:55] Cisco (15493) has joined this session.
[2012-04-27 06:37:03] Cisco (15493): Hello Brett! Welcome to Linksys Live Chat. How may I help you?
[2012-04-27 06:37:32] Me: I recently bought a wrt120n and am having trouble configuring it
[2012-04-27 06:38:11] Me: I have a wireless network already set up in my house and want to use the wrt120n as a wireless access point to plug some non-wireless devices into
[2012-04-27 06:38:50] Me: so i don't want to touch the existing network, I just want to add a hub on the other side of the house that I can plug ethernet cables into
[2012-04-27 06:42:06] Cisco (15493): You mentioned that you already have an existing wireless network in your network. Do you mean, that you want the Linksys router (WRT120N) to be wirelessly connected to the existing router?
[2012-04-27 06:42:24] Me: correct
[2012-04-27 06:43:56] Cisco (15493): Basically, the router is designed to provide wireless connection in a network. Thus, it has the ability to broadcast a wireless network for the wireless computers/devices to connect to. However, the router isn't capable of detecting or connecting to an existing wireless network. Therefore, you can only connect the Linksys router wired to the existing router in your network.
[2012-04-27 06:44:48] Me: so I bought the wrong product? What do I need to look for in the description to do what I want?
[2012-04-27 06:45:57] Cisco (15493): Do you need a device to be wirelessly connected to your router, and then connect wired computers/devices to that device?
[2012-04-27 06:46:15] Me: yes, got it exactly
[2012-04-27 06:48:50] Cisco (15493): In that case, you need a wireless bridge. We have two wireless-N bridges. One is WET610N wireless bridge which has only one Ethernet port, and the other one is our new wireless bridge which is the WES610N and it has 4 Ethernet ports.
[2012-04-27 06:50:04] Me: ok
[2012-04-27 06:50:46] Cisco (15493): Do you have any other questions or concerns that I can assist you with? Please feel free to bring them up while I'm still with you.
[2012-04-27 06:51:27] Me: what do the wag- and wap- series products do? (just in case the wes610n isnt in store when i return this one)
[2012-04-27 06:53:18] Cisco (15493): The WAG device is a wireless gateway. It acts as a modem and a router at the same time while the WAP is a wireless access point which provide wireless connection to the computers/devices, in case the network doesn't have wireless connection yet like the router is wired and has no wireless capability.
[2012-04-27 07:02:02] Cisco (15493): The WAG can provide wireless connection in a network, but just like the router, it has no ability to detect or connect to an existing wireless network.
[2012-04-27 07:02:17] Cisco (15493): You may check on this link to learn more about our WAG120N:
http://homesupport.cisco.com/en-apac/support/gateways/W...
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So, in essence, only the WES- products will to the wireless network extension.
HTH