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TF2 server packet flooding - Page 2

post #11 of 12
Hi,

I was facing the same problems on my servers. Please find more details here:

http://www.vanillatf2.org/2011/01/fighting-dos-attacks/

The problem you might have and we now have is that it's not enough to just block ffffffff54-ffffffff57. There are much more possible packages. The TF2 gameserver even responds to random number packages like ffffff1234567. The only thing you can do is block everything with "FFFFFF" at the beginning. But then. noone can join anymore so you have to limit it. I'm currently allowing 60 packages / second which is the default value of "sv_max_queries_sec_global". We have tested it with the exploit (flooding these kind of packages with hping and udp-spoofing) and it worked fine so far.

We even informed Valve about it and got a response within 5 minutes. They are aware about the problem and are working on it.
post #12 of 12
Thread Starter 
Thanks for the response. It either hasn't happened since I posted, or the iptables rules have fixed it. I haven't experienced it, nor has the guy maintaining the servers said anything about it happening. I will pass it along though.
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Deimos
(13 items)
 
Pluto
(18 items)
 
 
CPUMotherboardGraphicsRAM
AMD 1090T Biostar TA890FXE Nvidia GTX 470 Corsair Vengence 
Hard DriveHard DriveHard DriveHard Drive
Samsung 830 MZ-7PC128D/AM Western Digital Black Western Digital Green Western Digital Blue 
CoolingOSOSMonitor
Dtek v2 Water Windows 7 Pro Fedora 16 LG4250 42" LCD TV 
KeyboardPowerCaseMouse
Microsoft Ergo Silverstone ST-1000P Cooler Master Cosmos 1000 Logitech G500 
Mouse PadAudio
X-Trac Ripper Asus D1 
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Overclock.net › Forums › Software, Programming and Coding › Operating Systems › Linux, Unix › TF2 server packet flooding