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Linux iptables Pocket Reference by Gregor N. Purdy

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iptables Command Reference

Most of the options for the iptables command can be grouped into subcommands and rule match criteria. Table 1-15 describes the other options.

Table 1-15. iptables miscellaneous options

Option

Description

-c packets bytes

When combined with the -A, -I, or -R subcommand, sets the packet counter to packets and the byte counter to bytes for the new or modified rule.

--exact

Synonym for -x.

-h

Displays information on iptables usage. If it appears after -m match or -j target, then any additional help related to the extension match or target (respectively) is also displayed.

--help

Synonym for -h.

-j target [options]

Determines what to do with packets matching this rule. The target can be the name of a user-defined chain, one of the built-in targets, or an iptables extension (in which case there may be additional options).

--jump

Synonym for -j.

--line-numbers

When combined with the -L subcommand, displays numbers for the rules in each chain, so you can refer to the rules by index when inserting rules into (via -I) or deleting rules from (via -D) a chain.

-m match [options]

Invoke extended match, possibly with additional options.

--match

Synonym for -m.

-M cmd

Used to load an iptables module (with new targets or match extensions) when appending, inserting, or replacing rules.

--modprobe=cmd

Synonym for -M.

-n

Displays numeric addresses and ports instead of looking up and displaying domain names for the IP addresses and displaying service names for the port numbers. This can be especially ...

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