params — Shorewall parameters file
/etc/shorewall/params
Assign any shell variables that you need in this file.
It is suggested that variable names begin with an upper case letter to distinguish them from variables used internally within the Shorewall programs
Example params file:
NET_IF=eth0 NET_BCAST=130.252.100.255 NET_OPTIONS=routefilter,norfc1918
Example shorewall-interfaces(5) file.
ZONE INTERFACE BROADCAST OPTIONS net $NET_IF $NET_BCAST $NET_OPTIONS
This is the same as if the interfaces file had contained:
ZONE INTERFACE BROADCAST OPTIONS net eth0 130.252.100.255 routefilter,norfc1918
http://www.shorewall.net/configuration_file_basics.htm#Variables
shorewall(8), shorewall-accounting(5), shorewall-actions(5), shorewall-blacklist(5), shorewall-hosts(5), shorewall-interfaces(5), shorewall-ipsec(5), shorewall-maclist(5), shorewall-masq(5), shorewall-nat(5), shorewall-netmap(5), shorewall-policy(5), shorewall-providers(5), shorewall-proxyarp(5), shorewall-route_routes(5), shorewall-routestopped(5), shorewall-rules(5), shorewall.conf(5), shorewall-tcclasses(5), shorewall-tcdevices(5), shorewall-tcrules(5), shorewall-tos(5), shorewall-tunnels(5), shorewall-zones(5)