Install this http://forums.alliedmods.net/showthread.php?t=114787

On Sun, May 2, 2010 at 3:10 AM, Marek Sieradzki
<[email protected]>wrote:

> Servers of my HL2 (Orange Box) mod receive these UDP packets:
> FFFFFFFF71303030303030303030303030303000 (20 bytes long) with spoofed
> source IP. Linux servers can easily firewall these but it's harder on
> Windows. I also don't know if attacker can use a different packet data
> to achieve the same result.
> Result of the attack is server disappearing from Steam browser, ticks
> run per second go down to ~1 and CPU use skyrockets. As far as I know
> attacked server doesn't receive a lot of these packets. Something
> around 100 per second.
>
> I'm sending it to hlds_linux because I'm not registered on hlds list. :)
>
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