Exemple 


##> Interfaces
# loopback interface
if_loop="lo0"

# internal interface
if_int="hme0"

# external interface (ADSL)
if_ext1="hme1"

# external interface (CABLE)
if_ext2="hme2"

# dmz interface
if_dmz="hme3"

# wireless interface
if_wifi="hme4"

# all the gateway interfaces
if_all="{" $if_loop $if_int $if_ext1 $if_ext2 $if_dmz $if_wifi "}"