New Cable Modem, could not host a game.

I have a WRT54GS v4
I just receved a new cable modem last week ( jan 19 2007 ) from my Internet provider and now i could not host game* but i could join a game... ( via IP or game server ) The internet and IP phone work well. ( Modem brand & model is: ARRIS TM502G )
My IP adress on my router is XX.XX.XXX ** for last 4 - 5 month. ( before and after Modem installation )
I decided to bypass my router and connect my PC directly to the modem and is work ( i could host ! YES !... ) I check the IP adress of the Modem and it was different of the router adress... ? ( was ZZ.ZZ.ZZZ ** )
I dicided to re-plug the router back to the modem and re-connected my PC back to the router. Suprise... the IP adress is still the original one ( XX.XX.XXX **)
I think my hosting probleme is coming from the router because it's work when connected directly to the cable Modem.
Could you please help me to set up my router so i will be able to play again and host a game... Was working fine just before the new Modem with my router ( port and configuration was ok and have not change )
THX guys
gilles
[email protected]
* I play Midtown Madness 2 from Microsoft ( 1999 game )
**IP adress for explanation of my problem ( not real adress )

can't think of anything else other than the MTU...try changing the MTU settings on the router to 1396...also , run TCP OPTIMISER on the computer...this will adjust the mtu settings of the NIC card on the computer....

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