E-Lins H750 Series User Manual page 68

 Enable: enable GRE tunnel feature
 TTL: Time-to-live
 MTU: Maximum transmission unit.
 Peer IP address: Remote WAN IP address.
 Remote Network IP: remote LAN subnet address that can be accessed via GRE
tunnel, such as 192.168.10.0
 Remote Netmask: remote LAN subnet mask. Such as 255.255.255.0.
 Local Tunnel IP: Virtual IP address. It cannot be in same subnet as LAN network.
 Local Tunnel Mask: Virtual IP mask.
 Local Interface: bond a specific interface for GRE tunnel.
 Keepalive: None, receive only, send and receive. If value is None, GRE tunnel will
remain up, if value is receive only , if no GRE keepalive message received for peer
device, it will set tunnel to up. If value is send and receive, it will send keepalive
message to remote peer, and also receive keepalive message from peer.
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H750 User Manual
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