Chapter 25 L2TP VPN

IPSec Configuration Required for L2TP VPN

You must configure an IPSec VPN connection for L2TP VPN to use (see Chapter 20 on page

351 for details). The IPSec VPN connection must:

•Be enabled.

•Use transport mode.

•Not be a manual key VPN connection.

•Use Pre-Shared Key authentication.

•Use a VPN gateway with the Secure Gateway set to 0.0.0.0 if you need to allow L2TP VPN clients to connect from more than one IP address.

Using the Default L2TP VPN Connection

Default_L2TP_VPN_Connection is pre-configured to be convenient to use for L2TP VPN. If you use it, edit the following.

Configure the local and remote policies as follows.

•For the Local Policy, create an address object that uses host type and contains the My Address IP address that you configured in the Default_L2TP_VPN_GW. Use this address object in the local policy.

•For the Remote Policy, create an address object that uses host type and an IP address of 0.0.0.0. Use this address object in the remote policy.

You must also edit the Default_L2TP_VPN_GW gateway entry.

•Configure the My Address setting according to your requirements.

•Replace the default Pre-Shared Key.

Policy Route

You must configure a policy route to let remote users access resources on a network behind the ZyWALL.

•Set the policy route’s Source Address to the address object that you want to allow the remote users to access (LAN_SUBNET in the following figure).

•Set the Destination Address remote users (L2TP_POOL

to the IP address pool that the ZyWALL assigns to the in the following figure).

• Set the next hop to be the VPN tunnel that you are using for L2TP.

Figure 296 Policy Route for L2TP VPN

L2TP_POOL

LAN_SUBNET

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ZyWALL USG 100/200 Series User’s Guide