Here we will show you how to configure a GRE over IPSec LAN to LAN VPN tunnel between two Vigor2760 routers as shown in the diagram below:
Configure Site A 2760 router.
Configure Site B 2760 router.
Step 3: Check VPN status
Check the VPN status on Site A router.
Check the VPN status on Site B router.
Ping GRE tunnel to check the connectivity.