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GRE Tunnel
Generic Routing Encapsulation (GRE) is a tunneling protocol that can encapsulate a wide variety of
network layer protocol packets inside virtual point-to-point links over an IP network.
Note: up to 16 tunnels can be added.
Rule Index: The Index to mark the session.
Connection Name: User-defined name for the connection.
Active: Select Yes to activate the GRE tunnel.
Interface: Select the exact WAN interface configured for the tunnel as the local IP.
Remote Gateway: The remote GRE gateway IP.
Tunnel Local IP: Please set the source IP for the local tunnel. It is a virtual interface for the tunnel.
Tunnel Network Netmask: Please set the netmask for the local tunnel.
Tunnel Remote IP Address: Set the peer IP address of the tunnel. It is a virtual interface for the
tunnel.
Remote Network IP Address: Please set the subnet IP for remote network.
Remote Network Netmask: Please set the Netmask for remote network.
Enable Keepalive: Normally, the tunnel interface is always up. Enable keepalive to determine when
the tunnel interface is to be closed. The local router sends keepalive packets to the peer router, if
keepalive response is not received from peer router within the allowed time (‘retry time’ multiply
‘interval’, based on default settings, the time interval can be 30 seconds), the local router will shut up
its tunnel interface.
Keepalive Retry Times: Set the keepalive retry times, default is 3.
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