iptables(8) (cont.)

• -I, --insert

• Insert one or more rules in the selected chain as

• the given rule number. So, if the rule number is

• 1, the rule or rules are inserted at the head of

• the chain. This is also the default if no rule

• number is specified.

• -L, --list

• List all rules in the selected chain. If no chain

• is selected, all chains are listed. It is legal to

• specify the -Z (zero) option as well, in which case

• the chain(s) will be atomically listed and zeroed.

• The exact output is affected by the other arguments

• given.

• -F, --flush

• Flush the selected chain. This is equivalent to

• deleting all the rules one by one.

• -Z, --zero

• Zero the packet and byte counters in all chains.

• It is legal to specify the -L, --list (list) option

• as well, to see the counters immediately before

• they are cleared. (See above.)

• -N, --new-chain

• Create a new user-defined chain by the given name.

• There must be no target of that name already.

• -X, --delete-chain

• Delete the specified user-defined chain. There

• must be no references to the chain. If there are,

• you must delete or replace the referring rules

• before the chain can be deleted. If no argument is

• given, it will attempt to delete every non-builtin

• chain in the table.

Notes: