Half-Life Dedicated server behind a firewall

[FMJGomerPyle]

Ok, I have a linux machine connected to the internet acting as a firewall for my LAN. I want to run a Half-life dedicated server on a computer behind the linux machine. I have the linux box set up to foward all tcp and udp ports from 27000 to 27999 to the ip of the computer on the LAN. The server works fine if you know exactly where to look for it. However, it doesn't properly register itself with the WON master server. So if you update your list in half-life, it'll never come up until you manually enter the ip address of it. Does anyone know how i can get this working right?

 

[MajesticMoose]

bump

 

[Davegod75]

what is the protocol halflife uses?