GRE Tunnel between Teltonika RUT950 and DrayTek

Generic Routing Encapsulation is a simple IP packet encapsulation protocol. A GRE tunnel is used to send IP packets from one network to another, without being parsed by any routers in between. This article demonstrates how to set up a GRE tunnel between Teltonika RUT950 router and a Vigor Router.

Settings of Teltonika RUT950 Router

1. Go to GRE Tunnel page and create the profile as follows:

Enter the WAN IP of Vigor Router at Remote Endpoint IP address
Enter Vigor Router's LAN network IP and mask in Remote network and Remote network netmask
Enter a Local Tunnel IP (this is the GRE IP) and the Local tunnel netmask as "32"
Use 1400 for MTU

a screenshot of GRE Tunnel Setup on RUT950

2. Check Disable NAT in GRE Tunnel Configuration

a screenshot of disable NAT in GRE Tunnel Configuration of RUT950

Settings of Vigor Router

Before setting up the tunnel, please make sure PPTP service is enabled in VPN and Remote Access >> Remote Access Control.

1. Go to VPN and Remote Access >> LAN to LAN page, click an available index number and create a profile as follows.

In Common Settings, give a Profile Name, Enable this profile, and select GRE Tunnel.
In GRE Settings, enter Peer GRE IP as the GRE IP configured on Teltonika RUT950 router.
In TCP/IP Network Settings, enter Remote Gateway IP as the WAN IP of Teltonika RUT950 router.
And enter Remote Network IP/Mask as the LAN Network of the Teltonika RUT950 router.
Click OK to save the profile.

2. The GRE tunnel will be up as soon as we finish the configurations. We may go to VPN and Remote Access >> Connection Management to check the status.