SunScreen 3.1 Administration Guide

Using NAT with HA in Routing Mode

Depending on the configuration for NAT that you are using, 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 will work after a fail-over. 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, it is easier if you automate this in one of your start-up scripts. For more information on configuring NAT, see the SunScreen Reference Manual, and for more information on ARP, see the man page for arp.