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| iptables port connection limit rule I want two create two iptables rules: 1) A connection to port 22 can only be made once every 60 seconds per IP. 2) There can only be 1 new connection to port 22 every minute with a burst of 10, regardless of IP. The first two lines enforce rule 1). iptables -A INPUT -p tcp --dport 22 -i eth1 -m state --state NEW -m recent --set iptables -A INPUT -p tcp --dport 22 -i eth1 -m state --state NEW -m recent --update --seconds 60 --hitcount 2 -j DROP The next one enforces rule 2). iptables -A INPUT -p tcp --dport 22 -i eth1 -m limit --limit 1/minute --limit-burst 10 -j ACCEPT I would rather have the --limit rule first, but I haven't found a way for it to say, "continue to the next rule if true, drop if false". Then if someone does a DDOS attack with a big botnet the packets will get dropped before going through two rules. Ideally: iptables -A INPUT -p tcp --dport 22 -i eth1 -m limit --limit 1/minute --limit-burst 10 -j "continue to the next rule if true, drop if false" iptables -A INPUT -p tcp --dport 22 -i eth1 -m state --state NEW -m recent --set iptables -A INPUT -p tcp --dport 22 -i eth1 -m state --state NEW -m recent --update --seconds 60 --hitcount 2 -j DROP iptables -A INPUT -p tcp --dport 22 -i eth1 -m state --state NEW -j ACCEPT |
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