I am not one of the gurus here but to me this configuration seems somewhat complicated to begin with
The Asus has a built in firewall and you can hard wire 4 PC's onto it so I would suggest to connect the modem directly to the Asus in home gateway mode.
AFAIK the most simple setup would be that the modem is in bridge mode (it just forwards ISP assigned IP and traffic to WAN port of Asus) and that the Asus does the DHCP thingy and other network stuff.
In case this set up works you could change configuration as you prefer but at least you would know it can work
Edit: For your current config I think the Asus should be set in Access Point mode (System setup - Operation mode)
Last edited by kwenie; 25-06-2005 at 08:55.
Stuff I mess around with: Asus WL500gx (1.9.2.7-7g + new bootl. - on USB: HD + HP DeskJet 843C) - Notebook (Medion - Intel Centrino Pentium M-735 1.7GHz, 1280MB, 100GB - Intel PRO/Wireless 2200BG + WPA-PSK, XP-home) - Desktop (Medion PIII-1GHz, XP-prof, Lan) - ADSL2+ (Livebox in bridge mode)