Linux Administration Cookbook

iptables

Typically, you want to check the running configuration of a firewall on a box. To do this, you might use iptables -L:

$ sudo iptables -LChain INPUT (policy ACCEPT)target prot opt source destination ACCEPT all -- anywhere anywhere ctstate RELATED,ESTABLISHEDACCEPT all -- anywhere anywhere INPUT_direct all -- anywhere anywhere INPUT_ZONES_SOURCE all -- anywhere anywhere INPUT_ZONES all -- anywhere anywhere DROP all -- anywhere anywhere ctstate INVALIDREJECT all -- anywhere anywhere reject-with icmp-host-prohibitedChain FORWARD (policy ACCEPT)target prot opt source destination ACCEPT all -- anywhere anywhere ctstate RELATED,ESTABLISHEDACCEPT all -- anywhere anywhere FORWARD_direct all -- anywhere anywhere FORWARD_IN_ZONES_SOURCE all ...