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User Manual for NRSW version 4.5.0.100
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 defined 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 GRE Configuration
Peer address The IP address of the remote peer
Interface The device type for this tunnel
Local tunnel address The local IP address of the tunnel
Local tunnel netmask The local subnet mask of the tunnel
Remote network The remote network address of the tunnel
Remote netmask The remote subnet mask of the tunnel
Tunnel key Gre tunnel key allows the remote server to distinguish between GRE
packets from different communication partners
In general, the local tunnel address/netmask should not conflict 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.
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