about syncookies firewall?

Hello, all.

I have read some documents about the "syncookies firewall." and the URL is like below.  

http://web.archive.org/web/20020202205255/www.bronzesoft.org/projects/scfw/

I have read that documents and I think that the theory of the syncookies firewall is alike tcp-intercept mode of the cisco router, right?

anyone who used this syncookies firewall at your linux box? is there any cpu or memory leak?
and, is it possible at linux kernel 2.4?

I saw some commercial firewall use this function.

and I would like to know real time dynamic backlog queue size of the system when synflooding attack.
Surely, it doesn't mean the fixed value of the tcp_max_syn_backlog. I couldn't find any solution or command about this.

any idea?

Do you need help?

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Thanks in advance.

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