proxyarp

sharewall is very good

#
# Shorewall version 4 - Proxyarp File
#
# For information about entries in this file, type "man shorewall-proxyarp"
#
# See http://shorewall.net/ProxyARP.htm for additional information.
#
###############################################################################
#ADDRESS	INTERFACE	EXTERNAL	HAVEROUTE	PERSISTENT
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE