Rafael -
RCON is just completely/inherently insecure, which I am sure by now somebody 
else has pointed-out in detail.
If somebody hasn't said so already, just disable RCON, and use server-side mod 
instead:

---> AMX-Mod-X for old GoldSrc engine games (HL1, TFC, CStrike 1.6, etc.)

---> SourceMod for Source/Orangebox engine games (HL2, TF2, CS:S, etc.).

In addition to providing a lot of functionality without having to send commands 
to the console, they both also have their own RCON-equivelant way of 
accomplishing that to.  And, authentication is generally based on the 
behind-the-scenes SteamID of the player - which (in theory) is already 
"secured" (Steam tickets - kind of like kerberos by the sounds of it).

> Message: 3
> Date: Fri, 28 Sep 2012 00:58:46 -0300 (Hora oficial do Brasil)
> From: "Rafael" <[email protected]>
> To: <[email protected]>
> Subject: [hlds] Bruteforcing RCON
> Message-ID: <50652076.000005.05900@PC1-PC>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> Someone is bruteforcing on my server with spoofed IPs and i have no idea on
> how to stop it! Today my listip.cfg was about 1,1k of banned ips...
> 
> 20min logging: http://puu.sh/19j7X and there is even more! (about 20k+ of
> lines)
> 
> I have to disable rcon (rcon_password) to avoid banning shared ips used on
> spoof...
> 
> Any solutio for that? There is a way to make rcon_password only to specified 
> IPs? Thanks anyway!

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