WRT54G - cannot log in to router?

Question

We have just moved to a new house and had to change our ISP. We have gone with AT&T/Yahoo DSL Internet as it's our only option out here unfortunately.
When I'm hardwired into the DSL modem, I can get to the net, however, if I try and access it through the router I cannot.
Previously at our old house I had set-up the wireless network with a different SSID and 128bit WEP key.  All computers were able to connect fine.
I plugged it into the new modem and went to search for a wireless network and found it listed and was able to connect just fine on 2 different laptops.  However, we were unable to access the Internet.  So I went into the router via the local IP to check everything out, all looked correct.  So then I decided maybe I would just reset the router and start from scratch.
I unplugged it, held in the reset button while plugging power back in.  It took me to a firmware update page...which I wasn't expecting but I guess that's the firmware update reboot method...my bad.  So I connected via my Sprint EVDO card and downloaded the latest firmware...1.02.2.  Installed and got a success message.
Then I downloaded the owners manual and followed the directions to reset the router (hold down the reset button for 5 seconds...more like 8) and reset it. 
Now when I try and access the router (192.168.1.1) I get the same log-in pop-up window, but nothing I put in works!
I've tried the standard blank user name and 'admin' as the password, I've tried username: admin, password: admin, I've tried my old password and user name...nothing.
After I hit cancel about 5 times it takes me to what looks like the page for the router settings but it's not all there...I can see that the SSID has been reset to the factory name but I cannot navigate, etc.
What have I messed up!?
Any help would be GREATLY appreciated.

Answer 1

I'm a bit confused when you said  "The router uses 192.168.1.254 as its IP address".  Do you mean that your Motorola modem is using this address?
Just to clarify:  Just because your Motorola has only one ethernet port, this does not mean that it is not a router.  Motorola makes several routers that have only one ethernet port, including the 2100 series.  For example, using only an additional hub or switch, you can connect 32 network devices to the 2100 modem-router.  I was unable to locate a manual for your 2210-02, but I would not be surprised if it can do the same.  If you have a URL for the manual for your 2210-02 modem, please post it.
I am suspicious that your Motorola and your Linksys are both trying to use the same 192.168.1.x  address space.
Now that you can access your WRT54G, you will need to change its address to 192.168.2.1     To do this, do the following:
Go back to my 10 step post and do steps 1, 2, and 6 thru 10, except in step 10, instead of exiting your browser, do the following:
Set the "Local IP address" to 192.168.2.1  then click the "Save Settings" button, then wait (3-60 seconds) for the screen to refresh.  Note:  You might be disconnected from the router at this point - don't worry if this happens.
Next power down the router.
Reconnect the ethernet port of the Motorola to the Internet port on the WRT54G.
Power up your system, and test it.
Note that your Linksys will now be using the 192.168.2.x  address space.  To access the Linksys setup pages, point your browser to 192.168.2.1
Hope this helps.
Message Edited by toomanydonuts on 10-10-2007 10:32 PM