Virtual Private Networks (VPN) Generic Routing Encapsulation (GRE)
Digi TransPort WR Routers User Guide
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Generic Routing Encapsulation (GRE)
Generic Routing Encapsulation (GRE) is an IP packet encapsulation protocol. You can use GRE to
encapsulate a wide variety of network layer protocols inside virtual point-to-point links over an IP
network.
Configuring a GREtunnel
Configuring a GREtunnel involves the following items:
Required configuration items
n GRE tunnel configuration:
l Enable the GRE tunnel.
The GRE tunnels are disabled by default.
l The IP address or domain name of the remote device/peer.
l The GRE network IP address and mask.
n IP routes and filters:
IP routes and filters are not set up automatically, because the specific local and remote
networks need to be configured.
l A route for each remote network to be accessed via the GRE tunnel.
l An IP forwarding filter for each local LAN network.
Additional configuration items
n A description for the GRE tunnel.
n A GRE key.
Example GRE tunnel
In the following example, a GREtunnel is created between a local device with the GREIP address of
10.10.0.2 and a remote device with a WAN IP address of 47.23.78.32 and a GREaddress of 10.10.0.1:
Web
Configure a new GRE tunnel
1. On the menu, click Network > Services > GRE.
The GRE page appears.
2. Click New GRE tunnel.
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