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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
Explanation
1.
Enable GRE Tunnel
Check the box to enable the GRE Tunnel function.
2.
TTL
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.
3.
PMTUD
Check the box to enable the Path Maximum Transmission Unit Discovery (PMTUD)
status on this tunnel.
4.
Remote tunnel network
address
Specify remote LAN Subnet address.
5.
Remote CIDR
Specify remote LAN Subnet CIDR value.
6.
Remote IP address
Specify remote WAN IP address.
7.
MTU
Specify the maximum transmission unit (MTU) of a communications protocol of a
layer in bytes.