perhaps you need to have a DHCP server? I'm not familiar with motorola routers or if they include this feature, but it makes sense that if only 1 device can be on at a time, then you're using IP passthru instead of NAT.

 

when I configured the PS2 for online play I did use the IP of the computer that is online at the same time. Maybe I can purchase a second IP through my ISP. Thanks for the help.

 

yes the extra IP can work, but costs $$$.

when she's not playing the game, access the router configuration
(typical url is something like 192.168.x.y and you'll need to play with
x=0,1,2
y=0,1,2)

verify DHCP is enable for IP & DNS addresses

save/apply the settings

update your network settings on the NIC to also use IP & DNS addresses

Both systems should be able to run at the same time :-0