Gre - NetModule NB3000-Line-Hd User Manual

5.6.4. GRE

The Generic Routing Encapsulation (GRE) is a tunneling protocol that can encapsulate a wide
variety of network layer protocols inside virtual point-to-point links over IP. GRE is de ned in
RFC 1701, 1702 and 2784. It does not provide encryption nor authorization but can be used
on an address-basis on top of other VPN techniques (such as IPsec) for tunneling purposes.
The following parameters are required for setting up a tunnel:
Parameter
Peer address
Interface
Local tunnel address
Local tunnel netmask
Remote network
Remote netmask
In general, the local tunnel address/netmask should not con ict with any other interface
addresses. The remote network/netmask will result in an additional route entry in order to
control which packets should be encapsulated and transferred over the tunnel.
NB3000-Line-Hd User Manual 4.2
GRE Con guration
The IP address of the remote peer
The device type for this tunnel
The local IP address of the tunnel
The local subnet mask of the tunnel
The remote network address of the tunnel
The remote subnet mask of the tunnel
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