IP Masquerading and Quake 1

[frank . grant]

Hi all,
     I have a linux box connected to the Internet by a modem and two windows95
boxes networked to the linux box. I have the Quake masquerading module turned
on. One person can play Quake over the internet fine, but as soon as the second
person logs on to the same Quake server then one of them gets disconnected. Can
two people play Quake or because the linux box has one internet ip number it
confuses the quake server?

Thanks
Frank