Sterile Knowledge Base

The A2S challenge makes anyone who queries your Steam game server prove they can receive a reply first, so spoofed queries cannot use your server as a reflector or flood it....

Every profile sets four rate limits for each source IP: packets per second, a packet burst, bits per second and a bit burst. Traffic above them is dropped before it reaches your server....

A service rule tells Sterile which port on your protected IP carries your game, so the filters made for that game are applied to its traffic....