iptables-apply will try to apply a new rulesfile (as output by iptables-save, read by iptables-restore) or run a command to configure iptables and then prompt the user whether the changes are okay. If the new iptables rules cut the existing connection, the user will not be able to answer affirmatively. In this case, the script rolls back to the previous working iptables rules after the timeout expires.
Successfully applied rules can also be written to savefile and later used to roll back to this state. This can be used to implement a store last good configuration mechanism when experimenting with an iptables setup script: iptables-apply -w /etc/network/iptables.up.rules -c /etc/network/iptables.up.run
When called as ip6tables-apply, the script will use ip6tables-save/-restore and IPv6 default values instead. Default value for rulesfile is '/etc/network/iptables.up.rules'.
iptables-restore(8), iptables-save(8), iptables(8).
Original iptables-apply - Copyright 2006 Martin F. Krafft <email@example.com>. Version 1.1 - Copyright 2010 GW <firstname.lastname@example.org or http://gw.tnode.com/>.
This manual page was written by Martin F. Krafft <email@example.com> and extended by GW <firstname.lastname@example.org or http://gw.tnode.com/>.
Permission is granted to copy, distribute and/or modify this document under the terms of the Artistic License 2.0.