a rule that says “accept everything” and a rule that says “accept everything on the loopback interface” can only be distinguished with -v). Otherwise some important criteria are omitted in the output, such as the interface in filter rules (e.g. To see the complete state of the firewall, you need to call iptables on each of the tables successively.Īdditionally, to get an accurate representation of the rules, you need to pass the option -v. On a given call, iptables only displays or modifies one of these tables, specified by the argument to the option -t (defaulting to filter). ![]() ![]() Iptables controls five different tables: filter, nat, mangle, raw and security.
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