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> We're looking to implement IPVS load balancers in front of our web
> servers, and we'd like to have the IPVS directors generate SYN cookies
> in case of a flood, instead of passing them down to the realservers.
Hi Alex,
Sorry, but as far as i understand SYN cookies, only the real server can
do that
as the TCP transaction is between client and real server (IPVS does only
DNAT)
But you can also "limit" the VIP to try to prevent SYN flood attacks
(just exemple):
iptables -I INPUT -i eth0 -p tcp --syn -j syn-flood
iptables -N syn-flood
iptables -A syn-flood -p tcp --tcp-flags ALL ALL -m limit --limit
5/minute -j LOG --log-level alert --log-prefix "syn-flood:"
iptables -A syn-flood -p tcp --tcp-flags ALL ALL -j REJECT --reject-with
tcp-reset
iptables -A syn-flood -p tcp -m limit --limit 500/second --limit-burst 5
-j RETURN
iptables -A syn-flood -p tcp -m limit --limit 5/minute -j LOG
--log-level alert --log-prefix "syn-flood-LIMIT(>500/s):"
iptables -A syn-flood -p tcp -j DROP
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