iptables -A INPUT -p tcp --syn --dport 22 -m connlimit --connlimit-above 4 --connlimit-mask 32 -j REJECT --reject-with tcp-reset
Chain INPUT (policy ACCEPT) target prot opt source destination REJECT tcp -- anywhere anywhere tcp dpt:20000 flags:FIN,SYN,RST,ACK/SYN #conn src/32 > 2 reject-with tcp-reset REJECT tcp -- anywhere anywhere tcp dpt:ssh flags:FIN,SYN,RST,ACK/SYN #conn src/32 > 2 reject-with tcp-reset Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination
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