NAME

       sanewall-action - set up custom filter actions

SYNOPSIS

       action chain name action

DESCRIPTION

       The action helper command creates an iptables chain which can be used to control the
       action of other firewall rules once the firewall is running.

       For example, you can setup the custom action ACT1, which by default is ACCEPT, but can be
       dynamically changed to DROP, REJECT or RETURN (and back) without restarting the firewall.

       The name can be any chain name accepted by iptables. You should try to keep it within 5
       and 10 characters.

           Note
           The names created with this command are case-sensitive.

       The action can be any of those supported by Sanewall (see actions for rules:
       sanewall-actions(5)). Only ACCEPT, REJECT, DROP, RETURN have any meaning in this instance.

EXAMPLES

       To create a custom chain and have some rules use it:

           action chain ACT1 accept

           interface any world
               server smtp ACT1
               client smtp ACT1

       Once the firewall is running you can dynamically modify the behaviour of the chain from
       the Linux command-line, as detailed below:

       To insert a DROP action at the start of the chain to override the default action (ACCEPT):

           iptables -t filter -I ACT1 -j DROP

       To delete the DROP action from the start of the chain to return to the default action:

           iptables -t filter -D ACT1 -j DROP

           Note
           If you delete all of the rules in the chain, the default will be to RETURN, in which
           case the behaviour will be as if any rules with the action were not present in the
           configuration file.

       You can also create multiple chains simultaneously. To create 3 ACCEPT and 3 DROP chains
       you can do the following:

           action chain "ACT1 ACT2 ACT3" accept
           action chain "ACT4 ACT5 ACT6" drop

SEE ALSO

           Sanewall program: sanewall(1)
           Sanewall configuration: sanewall.conf(5)
           actions for rules: sanewall-actions(5)
           administration tool for IPv4 firewalls: iptables(8)

AUTHOR

       Sanewall Team

COPYRIGHT

       Copyright © 2012, 2013 Phil Whineray <phil@sanewall.org>