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TCP Syn Flood

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by muhsinak Nov 17, 2002 last reply Feb 16, 2003

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How can I block TCP Syn Flood attacks on my linux server. I am running RH 7.3 and apache. Is there any settings for this on /proc/sys/net.

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iptables:

iptables -A INPUT -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROP

man iptables will give you more help.

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or
you can enable syncookies
it's in /proc/sys/net/ipv4/tcp_syncookies
set it to 1

kernel must be compiled with syncookies.

l0stbyte

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