What is the default probing address used for failover on SonicWall?

The default probing address for failover on SonicWall is responder.global.sonicwall.com. This address is used by SonicWall devices to monitor the availability of the internet connection when configured in a high availability setup. When one unit in a failover pair detects a problem with its primary connection, it probes this address to determine whether an actual failure has occurred or if the issue lies elsewhere.

By using this dedicated response address, the SonicWall firewall can effectively manage failover scenarios to ensure continuity of network services. This probing method helps in making informed decisions on whether to switch to a backup device or configuration, enhancing network reliability and uptime. Other options may represent different services or addresses, but only the specified address serves this specific monitoring function in the context of failover.