Gre Tunnel - Teltonika RUT750 LTE User Manual

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.
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 local IP address
3. Distant network IP address and Subnet mask
Field name
1. Enable GRE Tunnel
2. TTL
3. PMTUD
4. Remote tunnel network
address
5. Remote CIDR
6. Remote IP address
7. MTU
Explanation
Check the box to enable the GRE Tunnel function.
Specify the fixed time-to-live (TTL) value on tunneled packets [0-255]. The 0 is a
special value meaning that packets inherit the TTL value.
Check the box to enable the Path Maximum Transmission Unit Discovery (PMTUD)
status on this tunnel.
Specify remote LAN Subnet address.
Specify remote LAN Subnet CIDR value.
Specify remote WAN IP address.
Specify the maximum transmission unit (MTU) of a communications protocol of a
layer in bytes.
49