Depending on the configuration you use for NAT, you must add an ARP (Address Resolution Protocol) entry for static NAT mappings on all Screens in routing mode, active and passive, so that NAT can continue to work after a failover. You must replicate all non-SunScreen configurations, including static ARP entries, on all HA Screens. Because you must do this every time an HA Screen fails over or every time you reboot a Screen, you may want to automate this in one of your start-up scripts. For more information on configuring NAT, see "Network Address Translation" in SunScreen 3.2 Administrator's Overview. For more information on ARP, see the man page for arp(1M).