What exactly is VAC we hear you say? Well, it's an anti-cheat implementation introduced by valvesoftware to aid server admins in clamping down on those people in the community who have no respect for the game, nor for the people who actually play the game without the need of cheats.

VAC is a server-based implementation which means that it is installed on the half-life dedicated server, and will check clients are cheat free compliant -- if found not to be, it will issue a incremental ban from all VAC 'secure' servers. The ban that will be issued to the cheater will depend on the severity of the cheat, and or the number of offenses. We won't be listing exactly what VAC checks for, but we will detail how to activate the module on your server. Installing VAC on your server

Installing VAC on your server is a 2 minute process, and can be achieved in a number of ways.


1. add -secure to your hlds target line which will initiate the module download automatically from speakeasy.net when you start the hlds session.

OR

2. navigate to your cstrike/liblist.gam file, and open it with an editor such as notepad. You'll see a line in there which will say "secure 0", change the 0 to a 1 to activate it, save the file, and start your server up. The server will then download the latest version of the modules to your server. About VAC Updates

Valve periodically updates the VAC modules, which in turn, your server will download and update them automatically. You can keep uptodate with when new modules are released via Counter-Servers main page, or by subscribing to the VALVe mailing lists.