I was reading Steve Gibson's site today and came across an interesting
article on how he implemented SYN Flood protection for his site. 

http://grc.com/r&d/nomoredos.htm 

On the third page of the article he mentions that Dan Bernstein and Eric
Schenk implemented a similar fix for Linux back in 1996. 

http://cr.yp.to/syncookies.html  

That fix is in the kernel right now. It is disabled by default. Maybe it
should be enabled for LRP/LEAF.

echo 1 > /proc/sys/net/ipv4/tcp_syncookies
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