Digi TransPort WR44 - Configure Generic Routing Encapsulation (GRE) Interfaces

Configuring network interfaces ConfigureGeneric Routing Encapsulation (GRE)interfaces
Digi TransPort® Routers User Guide
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ConfigureGeneric Routing Encapsulation (GRE)interfaces
Generic Routing Encapsulation (GRE) is a means of transporting IP packets from one device to another
through an unencrypted point-to-point IP tunnel. You can configure multiple tunnels to multiple
devices. Once configured, a GRE tunnel is created between two devices.