Peer Tunnel IP:The remote tunnel ip address
Local Tunnel IP:The local tunnel ip address
Local Netmask:Netmask of local network
Keepalive:Enable or disable GRE Keepalive function
Retry times:GRE keepalive detect fail retries
Interval:The time interval of GRE keepalive packet sent
Fail Action The action would be exec after keeping alive failed
Click on "View GRE tunnels" keys can view the information of GRE
Port Forwarding
Port Forwarding allows you to set up public services on your network, such as
web servers, ftp servers, e-mail servers, or other specialized Internet applications.
Specialized Internet applications are any applications that use Internet access to
perform functions such as videoconferencing or online gaming. When users send
this type of request to your network via the Internet, the router will forward those
requests to the appropriate PC.