[LPDad]

I have that exact same router and it took a little bit of grief to get things all set up but finally everything worked.
Here are some things to help.

1. You MUST run the Windows XP network Setup wizard on ALL of your machines! Run the setup wizard on the XP machine, after which the wizard will give you some options. Choose to make a floppy and then use that floppy to load the setup wizard on the other machines. (And make SURE you choose the CORRECT option--In this case the option is "this puter connects to the internet via a lan" on ALL the computers.
2. I found that certain programs interfere with proper LAN function. For example--If If you have TwakXP installed and have certain options enabled, then you will have problems with your lan sharing files and/or communicating. Best way to solve troubleshoot these problems is to load each computer with the bare minimum running programs--to see if the lan works, If it does then restart programs one at a time until you get to a point where something does not work properly.

3. At the bottom of the SETUP tab screen on your Router's control panel MAKE sure that the " Keep Alive: " option is checked and SET the Redial Period to 30 Sec.
(don't use the connect on demand option unless the keep alive option does not work properly)

4. Connect your ROUTER Directly to the modem!!!

WALL
|
MODEM
|
ROUTER<------Computer 1
^ ^
| |----------------------Computer 2
|----------Computer 3

..and plug EACH computer into one of the ports on the Router.

5. On the DHCP tab of the Router control panel you want:
DHCP Server: x Enable
Starting IP Address: 192.168.1. 100
Number of DHCP Users: 4 (you can use 3 if you want)
Client Lease Time: 0

6. Setup tab:

Host Name: (leave blank)
Domain Name: (leave blank)
Firmware Version: 1.43, Sept 04 2002 <-- you want latest ver.
LAN IP Address:
...................................198 168 1 1 (Device IP Address)
....................................255.255.255.0 (Subnet Mask)

WAN Connection Type: make sure you have the correct option for your ISP --My DSL uses ppoe --yours may differ.

7. Under the ADVANCED tab choose Dynamic Routing tab:
Working Mode: Gateway

SAVE EVERYTHING

THAT should be it for the setup (put in your ISP username and password of course)

Plug all computer into the router.

Plug your router into your modem

Run the XP network wizard on EACH computer

Turn off your router (pull out the little power cord), turn off your modem

Wait 10 seconds or so.

Turn on your CABLE/DSL MODEM --Wait until your modem is up and running (and BLINKING merrily along) --30-60 seconds or so

Turn ON your ROUTER (plug the little power cord back in)

Wait until your ROUTER is up and running (and BLINKING merrily along also ) --30-60 seconds or so

REBOOT all of your 'puters.

Now if your computers are set up properly for sharing (beyond the scope of this post) then you should be up and running. Now you should be able to leave the router and modem on ALL THE TIME.
...and you connection should always be on. No matter which computer you turn on it should be able to access the internet.

Hope this helps.
Damn...my fingers are tired of typing....