Which is the public interface to use for ipfw when lagg(4)?

[Unga]

Hi all 

My server runs FreeBSD 9.0 (i386).

/etc/rc.conf shows:
#
cloned_interfaces="lagg0 lagg1"
#
ifconfig_em0="up"
ifconfig_em2="up"
ifconfig_lagg0="laggproto lacp laggport em0 laggport em2"
ipv4_addrs_lagg0="someIP/26"
#
ifconfig_em1="up"
ifconfig_em3="up"
ifconfig_lagg1="laggproto lacp laggport em1 laggport em3"
ipv4_addrs_lagg1="publicIP1/29 publicIP2/32"


The server is publicly accessed using publicIP1 and publicIP2.


In the ipfw rules:
cmd="ipfw -q add"
pif="???"

# Allow out ping
$cmd 00100 allow icmp from any to any out via $pif keep-state


What is the interface should I use for the pif? Is it lagg1?

Best regards
Unga