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https://docs.sophos.com/nsg/sophos-firewall/20.0/Help/en-us/webhelp/onlinehelp/index.html?contextId=CLI-system-ips-link_failover

link_failover

You can configure a VPN as a backup link. Traffic is sent through the the VPN connection whenever the primary link fails.

Command

system link_failover

Syntax

system link_failover
add [primarylink] [portname] [backuplink] [vpn] [gre] [tunnel] [tunnelname] [monitor PING host] [monitor TCP host] [ipaddress] [portnumber]

Options

add [primarylink] [portname] [backuplink] [vpn] [gre] [tunnel] [tunnelname] [monitor PING host] [monitor TCP host] [ipaddress] [portnumber]

Configure failover to use a VPN or GRE tunnel. When you use TCP host monitoring, you'll need to specify the TCP port to monitor. If you use ping monitoring the monitoring port isn't required.