Global Unnumbered Configuration

Because Tunnel Interfaces are not physical interfaces and have no inherent IP address, they must “borrow” the IP address of another interface. Therefore, the advanced routing configuration for a Tunnel Interface includes the following options for specifying the source and destination IP addresses for the tunnel:

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IP Address Borrowed From - The interface whose IP address is used as the source IP address for the Tunnel Interface.
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NOTE: The borrowed IP address must be a static IP address.
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Remote IP Address - The IP address of the remote peer to which the Tunnel Interface is connected. In the case of a SonicWall-to- SonicWall configuration with another Tunnel Interface, this should be the IP address of the borrowed interface of the Tunnel Interface on the remote peer.

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NOTE: The IP Address Borrowed From and Remote IP Address values apply to both RIP and OSPF for the Tunnel Interface. Changing one of these values in RIP will change the value in OSPF and vice versa.