Gre Tunnel - Billion BiPAC 4500NZ(L) User Manual

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 Internet Protocol (IP)
network. And the common use can be GRE over IPSec.
up to 8 tunnels can be added.
Note:
Active: Select Yes to activate the GRE tunnel.
Rule Index: 8 GRE rules can be added, 0-7 digit to mark each rule.
WAN Interface: Select the exact WAN interface configured for the tunnel as the local IP.
Remote Gateway: The remote gateway IP.
Tunnel IP: Please set the source IP for the local tunnel .
Tunnel Netmask: Input the netmask for the local tunnel.
Peer IP: Set the IP address of the peer 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.
Keepalive Interval: Set the keepalive Interval, unit in seconds. Default is 5 seconds.
MTU: Maximum Transmission Unit
Default Route: Select if to set the GRE tunnel as the default route.
113