US Robotics Wireless MaxG router Main Ip forwarding

Ok

I have a US Robotics wireless Maxg router (USR5461)

My problem is this i have a small network 2 personal systems, both running XP and one RHEL server (New Add)

i need a suggestion for the easiest solution to direct my ip 75.xxx.xxx.xxx to the lan IP 192.168.2.4

every time i attemp to get to the server it trys to log into my router.

any and all help would be greatly appreciated