ICMP is not required for the operation of the server, and blocking it completely will not have any negative effects on Garry's Mod, however, it will help reduce the attack vectors of a DDoS attack.
Assuming this server will be dedicated to Garry’s Mod, it’s safe to block absolutely all incoming ports (including ICMP) besides the ones required for Garry's Mod. This tutorial will teach you how to make a Garry's Mod game server.įirstly, we need to make sure the firewall is secure to reduce the chances of a security issue.
The instructions are designed for Ubuntu 14.04 32 bit, but should work on all versions of Ubuntu.
