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==GRE Tunnel==
'''GRE''' (Generic Routing Encapsulation RFC2784) is a solution for tunneling RFC1812 private address-space traffic over an intermediate TCP/IP network such as the Internet. GRE tunneling does not use encryption it simply encapsulates data and sends it over the WAN.
[[Image:Services vpn gre tunnel scheme.PNG]]
In the example network diagram two distant networks LAN1 and LAN2 are connected.
To create GRE tunnel the user must know the following parameters:
1. Source and destination IP addresses
2. Tunnel’s local IP address
3. Distant network’s IP address and Subnet mask
To create a new GRE instance, go to the GRE Tunnel tab, type in a name for your new instance in the text field below the GRE Tunnel tab and press the '''Add New''' button next to it.