Things to consider before getting a Garrys Mod. If a game server exceeds the bandwith capacity of the network interface gameplay may be negatively affected. as Garrys Mod, GMod game servers recorded at least 15mbps. So, you've learned how to start-up a Garry's Mod server, now Peer-to-Peer isn't active on all games, so if you are trying this on another game and it doesn't work, you may need to use Hamachi or a different VPN program of sorts. If you would like to make a Garrys Mod server for yourself and a few friends, you may wish to restrict your GMOD server so that random players cannot join. Our Garrys Mod, GMod server are hosted on a 250mBps network interface.