Security Basics mailing list archives
Re: managing a SYN flood
From: nick <nick () mobilia it>
Date: Fri, 05 Mar 2004 10:06:44 +0100
Bruyere, Michel wrote:
Hi, I know someone that is running a public Game server. He's actuallyManaging a syn flood really can't be done at the server level, even if you're denying all the traffic coming from the IP address (or addresses), it's still going to be clogging your pipe.facing a DDOS SYN flood by a player that has been banned from the server because of rules violation. I would like to know if you guys can point me to a good paper on how to mitigate the effect of the attack in order to be able to keep the system up. I don't have physical access to the server and I tried to help him out the best as I could but it would be easier to send him a good paper on the subject. BTW the server is in co-location on a 100mbits link and is running 2k server. I helped him to harden the server a little bit since it was WIDE open to the net. I also gave him the following article to help Windows a bit http://support.microsoft.com/default.aspx?scid=kb;en-us;142641&Product=win20 00 http://support.microsoft.com/default.aspx?scid=kb;en-us;315669&Product=win20 00 It helped somewhat but the server is still unable to deal with the flood. If you want more info ill be glad to give it out.Thx for your inputsM.Bruyere Network/systems administrator CompTIA A+, Network+
Someone else mentioned this as well, it has to be dealt with upstream, to stop the traffic before it arrives at your connection. Getting his (and quite possibly the flooder's) ISP involved is probably the best course of action, most ISPs don't look fondly upon that sort of behavior. At the very least, his ISP can probably stem the flow....
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Current thread:
- managing a SYN flood Bruyere, Michel (Mar 04)
- Re: managing a SYN flood JGrimshaw (Mar 04)
- Re: managing a SYN flood nick (Mar 08)
- RE: managing a SYN flood David Gillett (Mar 08)
- <Possible follow-ups>
- Re: managing a SYN flood H Carvey (Mar 04)
- RE: managing a SYN flood Joshua M. Jones (Mar 08)
- RE: managing a SYN flood Aditya, ALD [Aditya Lalit Deshmukh] (Mar 10)