/usr/share/fwbuilder-5.1.0.3599/configlets/bsd/pfsync_interface is in fwbuilder-common 5.1.0-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | ## -*- mode: shell-script; -*-
##
## Lines that start with "##" will be removed before this code is
## added to the generated script. Regular shell comments can be added
## using single "#", these will appear in the script.
##
##
## PFSYNC
## ifconfig pfsync-interface [maxupd n] [[-]syncdev iface]
## [[-]syncpeer peer_address]
##
## for pfsync and CARP see http://www.kernel-panic.it/openbsd/carp/
## "Redundant firewalls with OpenBSD, CARP and pfsync"
$IFCONFIG pfsync0 syncdev {{$syncdev}} {{if have_syncpeer}} syncpeer {{$syncpeer}}{{endif}}
$IFCONFIG pfsync0 up
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