The TD-W9970 modem router supports VPN pass-through, but it does not have built-in VPN server functionality. However, you can still create a VPN tunnel by using the router to connect to a remote VPN server.
Here are the steps to build a VPN tunnel with TD-W9970:
Choose a VPN server: First, you need to choose a VPN server to connect to. This can be a server that you have set up yourself, or a third-party VPN service.
Configure the router: Log in to the TD-W9970 web interface and navigate to "Advanced Setup" > "WAN Service". Click "Add" to create a new WAN connection. In the "WAN Connection Type" field, select "PPTP" or "L2TP" depending on the type of VPN server you are connecting to. Enter the VPN server address and login credentials in the appropriate fields. Click "Save" to save the settings.
Test the VPN connection: Once you have configured the router, test the VPN connection to make sure it is working correctly. You should be able to connect to the VPN server and access resources on the remote network.
With these steps, you should be able to build a VPN tunnel using the TD-W9970 modem router. Keep in mind that the specific steps may vary depending on the VPN server you are connecting to and any additional settings required.
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