Note: Sorry if I am not giving enough information, I don’t know much about networking.
My server has been offline for around 3 days so far, the information I have from my host (NFOServers) is that the packet they are spamming is a “connection packet” so blocking it would block legit traffic also so that isn’t much of a solution.
It’s been 3 days and I really would like to find a solution, the game server is Garry’s Mod.
Packet example from wireshark capture: http://puu.sh/9h41v/144c5fc457.png
Any help you can provide is much appreciated.