Specific information on Port Forwarding for a Garry's Mod dedicated server.

[kevinmd88]

Ladies and mentlegen,

Obviously, the port forwarding required to run a Garry's Mod dedicated server behind a home network is an easy, quick, and painless Google search.

However, I'm also a professional IT, network, and systems administrator whose mantra is "do not open things that you don't need," so when I see disparate information ranging everything from "27015 and 27005" to "27000-27050 TCP and UDP" I begin to cringe with discomfort over opening things up.

Hence, I've come here to see if anyone can provide specificity to the ports used by this server software.

The only thing I'm sure of is that your server itself needs the port you specify to be open. By default I believe that's 27015 (and can be set manually), but even this I'm not sure whether it needs to be TCP, UDP, or both. I believe there are also some ports that Steam makes use of for the master server browser, but information on those is just as unclear.

My goal here is to determine the specific ports and protocols used by the program. *For example*, I'd rather not open up both TCP and UDP on 27015 if Gmod only makes use of UDP.

As mentioned, the information I've scooped up from Google on this matter is unclear, inprecise, and promotes network vulnerability.

Can anyone fill in the knowledge? Or, has Garry himself provided any information to this end in the past? (If so, I couldn't find it - my bad!)

Thank you one and all

-Kevin

[Glitchvid]

Only 27015 UDP. You won't be able to RCON from outside the firewall though.

[kevinmd88]

[QUOTE=glitchvid;50101500]Only 27015 UDP. You won't be able to RCON from outside the firewall though.[/QUOTE]

Awesome, thank you for the valuable info regarding the 27015 port! Looks like the connection goes through with 27015 UDP forwarded. :)

Does the server host need a port forwarded to be listed in the master server browser in the game client too?

[Glitchvid]

[QUOTE=kevinmd88;50101775]Awesome, thank you for the valuable info regarding the 27015 port! Looks like the connection goes through with 27015 UDP forwarded. :)

Does the server host need a port forwarded to be listed in the master server browser in the game client too?[/QUOTE]

Sorry for the late response. No, everything except RCON should work through 27015.