RE: managing a SYN flood

["Joshua M. Jones" <jjones () isgwichita com>]

Log the ip address and call his ISP. Most will suspend or send him a
warning message. That's just my $0.02.

Josh

-----Original Message-----
From: Bruyere, Michel [mailto:mbruyere () ezemcanada com] 
Sent: Thursday, March 04, 2004 8:05 AM
To: 'security-basics () securityfocus com'
Subject: managing a SYN flood

Hi, 
        I know someone that is running a public Game server. He's
actually
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=w
in20
00

http://support.microsoft.com/default.aspx?scid=kb;en-us;315669&Product=w
in20
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 inputs 



M.Bruyere
Network/systems administrator
CompTIA A+, Network+



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to facilitate one-on-one interaction with one of our expert instructors.
Attend a course taught by an expert instructor with years of in-the-field
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of an Ethical Hacker to better assess the security of your organization.
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