D-Link DFL-260E User Manual for DFL-260E - Page 414
IPsec LAN to LAN with Pre-shared Keys, Remote Network
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9.2.1. IPsec LAN to LAN with Pre-shared Keys Chapter 9. VPN 9.2.1. IPsec LAN to LAN with Pre-shared Keys The objective is to create a secure means of joining two networks: a Local Network which is on the protected side of a local firewall; and a Remote Network which is on the other side of some remote device, located across an insecure network. The steps for setup are as follows: 1. Create a Pre-shared Key object. 2. Optionally create a new IKE Algorithms object and/or an IPsec Algorithms object if the default algorithm proposal lists do not provide a set of algorithms that are acceptable to the tunnel remote end point. This will depend on the capabilities of the device at the other end of the VPN tunnel. 3. In the Address Book create IP objects for: • The remote VPN gateway which is the IPv4 address of the network device at the other end of the tunnel (let's call this object remote_gw). This may or may not be another NetDefend Firewall. • The remote network which lies behind the remote VPN gateway (let's call this object remote_net). • The local network behind the NetDefend Firewall which will communicate across the tunnel. Here we will assume that this is the predefined address lannet and this network is attached to the NetDefendOS lan interface which has the IPv4 address lan_ip. 4. Create an IPsec Tunnel object (let's call this object ipsec_tunnel). Specify the following tunnel parameters: • Set Local Network to lannet. • Set Remote Network to remote_net. • Set Remote Endpoint to remote_gw. • Set Encapsulation mode to Tunnel. • Choose the IKE and IPsec algorithm proposal lists to be used. • For Authentication select the Pre-shared Key object defined in step (1) above. The IPsec Tunnel object can be treated exactly like any NetDefendOS Interface object in later steps. 5. Set up two IP rules in the IP rule set for the tunnel: • An Allow rule for outbound traffic that has the previously defined ipsec_tunnel object as the Destination Interface. The rule's Destination Network is the remote network 414