[cod] Query limiting...

[Luca Farflame Fabbro]

Same here
	same destination IP same port (5121)
	500 pps on 2 instances of cod 2, cod 4 servers not affected.
incoming traffic just less than 768 Kbit/s. Probably they have good upload "pipes" from where they start the attack.

On Oct 25, 2011, at 3:06 PM, Marco Padovan wrote:

> Looks like the trend is increasing :|
> 
> currently one of our network filters is reporting:
> rx:     7.14 Mbit/s 11064 p/s          tx:     3.62 Mbit/s  2764 p/s
> 
> disabling the filters and passing everything to the cod2 servers the resulting tx bandwidth is a constant 25mbit/sec stream :/
> 
> current IP being spoofed targeting cod2 servers (all versions "exploited"... both 1.0 and 1.3):
> 208.93.152.122 (port 5121)
> 
> to check out if your server is currently being exploited:
> tcpdump -nn host 208.93.152.122
> 
> 
> 
> Il 25/10/2011 12:43, Luca Farflame Fabbro ha scritto:
>> 
>> Hi Ryan
>> 	in one of your previous messages you mentioned that this patch can be "ported" also to the other COD servers. Is there any plan to do this?
>> Now it seems that even if the server are less in number they target the COD2 servers to do the DDOS attacks. Don't have any COD server running so I don't know if also those are used as reflectors.
>> 
>> Just one simple question  regarding the patch fort the COD4 server.
>> If you leave the server up'n running for a certain period of time (no restart for 3 weeks let's say) it seems that when the  
>> sv_queryIgnoreMegs
>> limit is reached (our servers don't have a lot of players) the server starts to reply to the query with the spoofed IP's. A restart of the server solves the problem.
>> I know that it will be better to restart the server before that time but would it be a possible solution to flush the stored bad IP's and restart the check on the new incoming packets when the predefined memory is full or just before this happens (% or minimum sv-ignore free memory)? Usually the attackers use the server as a reflector only for a certain amount of time (form 1 hour or less to a maximum of 2 - 3 days) then a lot of time will pass before having the same IP used as destination of the DDOS attack. 
>> 
>> Regards
>> 	Luca
>> 
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