D-Link DFL-2500 User Guide - Page 243
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224 Chapter 22. VPN Protocols & Tunnels 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 Keys → Add → Pre-Shared Key: Enter the following: Name: Enter a name for the pre-shared key, TestKey for instance. Passphrase/Shared Secret: Enter a secret passphrase. Passphrase/Confirm Secret: Enter the secret passphrase again. Then click OK 2. IPsec Tunnel Next step is to configure the IPsec tunnel. General Interfaces → IPsec Tunnels → Add → IPsec Tunnel: Enter the following: Name: IPsecTunnel Local Network: This is the local network that the remote users will connect to. So in the head office firewall 10.0.1.0/24 will be used and in the branch office firewall 10.0.2.0/24 will be used. Remote Network: This is the network that the remote users will connect from. So in the head office firewall 10.0.2.0/24 will be used and in the branch office firewall 10.0.1.0/24 will be used. Remote Endpoint: This is the public ip's of each firewall, where the tunnels will be terminated. This means that the head office firewall will use ip branch wan and the branch office firewall will use ip head wan. Encapsulation Mode: Tunnel Algorithms IKE Algorithms: Medium or High IPsec Algorithms: Medium or High Authentication Pre-Shared Key: Select the pre-shared key created earlier, TestKey in this case. Then click OK D-Link Firewalls User's Guide