apache 2.2 - use iptables to limit the number of concurrent http requests per ip

Currently my iptable is as follows to limit the number of concurrent connections per ip to 10 from any http client. However, I tried a simulated http test and I'm not getting dropped at all. what's wrong?


*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [21:15123]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT

-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A INPUT -p tcp -m tcp --dport 80 --tcp-flags FIN,SYN,RST,ACK SYN -m connlimit --connlimit-above 10 --connlimit-mask 32 -j REJECT --reject-with tcp-reset
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT

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