D-Link DFL-1600 User Manual page 246

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The following configuration will have to be done on the head office firewall.
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, SecretKey for instance.
Passphrase/Shared Secret: Enter a secret passphrase.
Passphrase/Confirm Secret: Enter the secret passphrase again.
Then click OK
Pre-Shared Keys
D-Link Firewalls User's Guide
Chapter 22. VPN Protocols & Tunnels
Add