With latest SonicOS , the routing protocol can use a numbered tunnel interface to establish a routing session. Numbered tunnels require an interface in the VPN zone using an IP address from a private subnet. This numbered tunnel interface can be used for the routing protocol session. After a numbered tunnel interface is added to the interface list, a static route policy can use it as the interface in a configuration for a static route based VPN. Routing protocols (OSPF, RIP, and BGP) can use it for dynamic route based VPN.
Maximum VPN Tunnel Interfaces Supported Per SonicWall Firewall Appliance varies with each model.
Note: The number listed as below includes both unnumbered and numbered VPN tunnel interfaces.