In order to properly handle GPRS Tunneling Protocol (GTP) synchronization under high stress loads, FortiOS 5.2 will use the interfaces set in set session-sync-dev (part of config system ha) to allow GTP tunnels to be synchronized directly over physical ports when both the HA primary and secondary are up.

A new diagnose command, diagnose firewall gtp hash-stat, has also been added to display GTP hash stat separately.