$ sudo iptables --L --n Chain INPUT (policy ACCEPT) target prot opt source destination f2b-default tcp -- 0.0.0.0/0 0.0.0.0/0 multiport dports 22 Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination Chain f2b-default (1 references) target prot opt source destination RETURN all -- 0.0.0.0/0 0.0.0.0/0