D-Link DFL-1600 User Manual page 260

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Example:
This example describes how to set up a L2TP client with IPsec, using
pre-shared keys. The L2TP server is located at 10.0.0.1 and all traffic
should be routed over the L2TP tunnel.
WebUI
:
1. Pre-Shared Key
First of all we need to create a pre-shared key to use for the IPsec
authentication.
Objects VPN Objects
Pre-Shared Key:
Enter the following:
Name: Enter a name for the pre-shared key, L2TPKey for instance.
Passphrase/Shared Secret: Enter the secret passphrase. (Has to be the
same as configured on the L2TP/IPsec server)
Passphrase/Confirm Secret: Enter the secret passphrase again.
Then click OK
Configuring L2TP/IPsec Client
D-Link Firewalls User's Guide
Chapter 22. VPN Protocols & Tunnels
Pre-Shared Keys Add