Method used to configure the L2TP over IPSec dial-up access for iPhone and Mac users on the USG2000 and USG5000

The method used to configure the L2TP over IPSec dial-up access for iPhone and Mac users on the USG2000 and USG5000 is as follows:

1. The configuration on the iPhone is as follows:
Choose Settings > General > Network > VPN. Select Add VPN Configuration. On the Add Configuration screen, select L2TP from Type.
Set the L2TP options as follows:
Description: L2TP VPN description. In this example, it can be set to any value.
Server: L2TP VPN server address. In this example, it is set to 188.135.3.146, that is, the IP address of the firewall.
Account: L2TP user name. It is set to the user name configured for the AAA on the firewall.
RSA SecurID: It determines whether to perform verification using the RSA ID. In this example, it is disabled.
Password: Password of the L2TP user. It is consistent with the user name.
Secret: Exchange key of the L2TP VPN, that is, the pre-shared key in the IKE. In this example, it is set to nawras.
Send All Traffic: It is enabled, so that all traffic is transmitted over the VPN.
IPSec configuration:
Generally, after you configure the L2TP options, the IPSec options are automatically filled in by the system. If not, fill in the options as follows:
Description: VPN description. In this example, it can be set to any value.
Server: IP address of the firewall interface. In this example, it is set to 188.135.3.146.
Account: L2TP user name. It is set to the user name configured for the AAA on the firewall.
Password: Password of the L2TP user. It is consistent with the user name.
User Certificate: The certificate is not required. This option is unavailable.
Group Name: The group name is not required. It can be left blank.
Secret: Pre-shared key in the IKE. In this example, it is set to nawras.

2. Configuration on the Mac OS:
a. VPN configuration on the Mac PC:
The IKE negotiation is set to the main mode.
The encryption algorithm for the IKE negotiation is set to 3DES.
The authentication algorithm is set to SHA-1.
The authentication method is set to PRE-SHARED-KEY (PSK).

The IPSec negotiation is set to transport mode.
The IPSec encryption algorithm is set to 3DES.
The IPSec authentication algorithm is set to MD5.
b. Configuration procedure:
Click Network. Click "+" in the lower left corner, and create a new service. Set VPN Type to L2TP over IPSec and Service Name to any value, for example, VPN (L2TP).
Set Service Address to the interface IP address of the firewall, and Account Name to the L2TP user name that must have been configured for the AAA. Then, click Authentication Setting.
Set password to the password of the L2TP user, and Shared Secret to the pre-shared key in the IKE peer, for example, nawras.
After the parameters are set, click OK. Then, click Apply in the lower right corner to validate the settings.
If the VPN connection is required, click Connect. The system automatically initiates the L2TP over IPSec negotiation. After the connection is established, the current state is displayed as Connected. A new IP address is allocated, that is, allocated by the L2TP.

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