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Convert PPTP VPN to L2TP VPN

There is no PPTP Server on the NGFW so use of the built-in windows VPN Client is not an option. NGFW does however offer L2TP, which is similar to PPTP and allows you to continue to use the same VPN client built into Windows. The following steps assume that you are already configured to use PPTP VPN on your Windows-based computer.

 

Configuring L2TP on NGFW

To use L2TP you need IPSec VPN on the NGFW. Once that is installed follow these steps to get it running:

  1. Go to IPSec VPN > Settings > L2TP Options, check Enable L2TP Server


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  2. If you wish, you can change the Address Pool, but it must be a unique subnet that is not already defined on the NGFW.

  3. Specify an IPSec secret. This will need to be added to the VPN client on the user computers as a second level of authentication.

  4. If you want to be able to connect on more than one external IP address, or if you want to use an address that is not the Primary WAN, you can change it in the Server Listen Addresses field.


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  5. Click Apply and then Ok.

  6. Go to Config > Local Directory.

  7. Add all of the users you want to be able to use L2TP. The username and password you specify here will be what they use to connect to the VPN.


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Configuring L2TP on Windows Computer

The last step is changing the configuration in the VPN Client itself. For most versions of Windows you can use these instructions:

  1. Open the VPN connection.

  2. Click the Properties button.

  3. Go to the Security tab.

  4. Change Type of VPN to "Layer 2 Tunneling Protocol with IPSec (L2TP/IPSec)".


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  5. Click the Advanced Settings button.

  6. Select Use preshared key for authentication and type in the secret you put in on step 3 above.


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  7. Click OK twice.

  8. Type your username and password and click Connect.
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