Digi AnywhereUSB Plus, User Manual, Page: 638 / 815

Virtual Private Networks (VPN) Generic Routing Encapsulation (GRE)
AnywhereUSB® Plus User Guide 638
Generic Routing Encapsulation (GRE)
Generic Routing Encapsulation (GRE) is an IP packet encapsulation protocol that allow for networks
and routes to be advertized from one network device to another. 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 GRE tunnel
Configuring a GRE tunnel involves the following items:
Required configuration items
n
A GRE loopback endpoint interface.
n
GRE tunnel configuration:
l
Enable the GRE tunnel.
The GRE tunnels are enabled by default.
l
The local endpoint interface.
l
The IP address of the remote device/peer.
Additional configuration items
n
A GRE key.
n
Enable the device to respond to keepalive packets.
Task One: Create a GRE loopback endpoint interface
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WebUI
1. Log into the AnywhereUSB Plus WebUI as a user with full Admin access rights.
2. On the menu, click System . Under Configuration , click Device Configuration .
The Configuration window is displayed.
3. Click Network > Interfaces .
4. For Add Interface , type a name for the GRE loopback endpoint interface and click g .
5. Enable the interface.
New interfaces are enabled by default. To disable, or to enable if it has been disabled, click
Enable .
6. For Interface type , select Ethernet .
7. For Zone , select Internal .
8. For Device , select Ethernet: Loopback .