170 | Aprisa LTE User Manual
Tunnel Key
An optional setting, to enables an ID key for a GRE tunnel interface. The tunnel key specifies a number from
0 to 4,294,967,295 that identifies the tunnel key. Note: The tunnel key must be set to the same value on
all hubs and spokes that are in the same DMVPN network.
Source Public Address
This configures the external IP address that is used for GRE packets. If left blank, the source address is
automatically determined based on best route to destination public address. For IP/Ethernet over GRE this
should be an IPv4 address, and for IP/Ethernet over GREv6 this should be an IPv6 address.
Destination public address
The address of the remote device that will terminate the tunnel.
TTL
The TTL to set on outgoing GRE packets. The default is 0, which means the TTL of encapsulated packets is
inherited.
MTU
The MTU to set on the virtual interface. When GRE is setup over the cellular interface, this MTU value shall
be equal or lower than the operator ‘Cellular MTU’ shown in Cellular > Summary. This rule is true for any
other interface.
Network
When Ethernet over GRE/GREv6 is used, this bridge interface that the tunnel will be joined to.
Source Interface
Optional, the source interface where all GRE tunnel packets must go through.
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