Fortinet FortiGate 4000 Benutzerhandbuch

Some implementations of L2TP support elements of IPSec. These elements must be 
disabled when L2TP is used with a FortiGate unit.

This section describes:

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Use the following procedures to configure the FortiGate unit as an L2TP gateway:

Add a user for each L2TP client.

Go to User > Local.

Add and configure L2TP users.
See 

Go to User > User Group.

Add and configure L2TP user groups.
See 

Go to VPN > L2TP > L2TP Range.

Select Enable L2TP.

Enter the Starting IP and the Ending IP for the L2TP address range.

Select the User Group that you added in 

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Select Apply to enable L2TP through the FortiGate unit.