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Old 12-08-2008, 01:44 AM
"Ken W."
 
Default syn-cookies useful?

Hello,


Is it useful to set net.ipv4.tcp_syncookies=1 to stop DDOS attacks on Linux? If set, what's the drawback on this option? Thanks.


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Old 12-08-2008, 03:36 AM
Sanjeev Mulay
 
Default syn-cookies useful?

<!--Apologies for the top post

Hi, using syn cookies is a useful defense against the traditional (i.e. High bandwidth) DOS attacks, but may not help against the newer, rate-limited vectors such as the one demonstrated by Sockstress.

No major performance or other drawbacks that I am aware of, but there could be some compatibility issues with (very?) old TCPIP stacks.

Regards,

Sent from my Windows Mobile® phone.

-----Original Message-----
From: Ken W. <techwww@yahoo.com.cn>
Sent: 08 December 2008 06:44
To: General Red Hat Linux discussion list <redhat-list@redhat.com>
Subject: syn-cookies useful?

Hello,


Is it useful to set net.ipv4.tcp_syncookies=1 to stop DDOS attacks on Linux? If set, what's the drawback on this option? Thanks.


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