go to the telus internet help desk (via phone) and ask for the IP address of the Telus web site that does MAC address registration. Go to that site with your web browser. Register the REAL MAC address of the LinkSys WAN port.
Remove the the MAC address clone on the LinkSys router. Things should work well after that.
If it still pukes, you probably have a bad operating system image on the LinkSys router.
I'd recommend you build the SmoothWall firewall on an old pc and ditch the LinkSys router.
t.t.
Enjoy life, Enjoy Cars!
Horsepower isn't enough if the car can't handle or brake!