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D-Link DSL-X1852E User Manual
Section 4 - Configuration
GRE
Generic Routing Encapsulation (GRE) is a tunneling mechanism that creates
virtual links for the two endpoints of the tunnel.
Configure the following to set up a GRE tunnel for VPN connections:
IPSec Settings
Remote Address:
Enter the WAN IP address of the remote gateway.
Peer Local
Address:
Enter the IP address of the local tunnel network interface.
Peer Remote
Address:
Enter the IP address of the remote tunnel network interface.
Private Tunnel
Address:
Enter the private IP address of the remote tunnel.
Private Tunnel
Netmask:
Enter the subnet mask of the private IP address of the remote tunnel.
Click
Save
when you are done.