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Allows you to restrict the number of parallel TCP connections to a server per client IP address (or address block). [!] --connlimit-above n match if the number of existing tcp connections is (not) above n --connlimit-mask bits group hosts using mask Examples: # allow 2 telnet connections per client host iptables -A INPUT -p tcp --syn --dport 23 -m connlimit --connlimit-above 2 -j REJECT # you can also match the other way around: iptables -A INPUT -p tcp --syn --dport 23 -m connlimit ! --connlimit-above 2 -j ACCEPT # limit the nr of parallel http requests to 16 per class C sized network (24 bit netmask) iptables -p tcp --syn --dport 80 -m connlimit --connlimit-above 16 --connlimit-mask 24 -j REJECT |
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