I'm curious, what do you mean when you say that the iptables solution "cannot 
be handled properly" on your busy servers?  Do the string checks create a lot 
of overhead and slow things down?

I have not experienced any attacks, but I agree that this is something that 
needs to be solved in the engine.  A cvar to limit the number of queries per 
second would be great.

    - Dave

----- Original Message -----
From: Marco Padovan <evolutioncr...@gmail.com>
Date: Wednesday, January 5, 2011 5:42 pm
Subject: [hlds_linux] tf2 denial of service - please do something!
To: Half-Life dedicated Linux server mailing list 
<hlds_linux@list.valvesoftware.com>

> I'm hosting many tf2 servers and lately we are getting a lot of 
> denial 
> of services...
> 
> basically we got our machservers spammed with query requests 
> till the 
> point they time out (the machine is running properly, it's just 
> the 
> gameserver slowly dieing)
> 
> an effective way to stop this kind of behaviour is:
> http://www.vanillatf2.org/2011/01/fighting-dos-attacks/
> 
> but that cannot be handled properly on boxes as busy as ours...
> 
> basically with just little effort anybody is able to take down a 
> single 
> gameserver spamming it with query requests :(
> 
> What can we do to stop that?
> Is there a decent plugin/official fix to get rid of this problem 
> instead 
> of doing packet inspection via iptables on boxes handling 10000+ 
> packets/second?
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