Method used to configure security policies in L2TP dial-up access scenario on the USG6000

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L2TP packets are transmitted over the Untrust and Local zones.
Decapsulated packets are transmitted over the DMZ (security zone where the VT interface resides) and Trust zones.

Other related questions:
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.

Method used to configure the security policy after the NAT policy is configured
After source NAT or destination NAT is configured, you can configure the security policy as follows: After source NAT is configured, configure the source IP address for packet filtering as the IP address before the NAT. After NAT Server, intrazone destination NAT, or SLB is configured, configure the destination IP address for packet filtering as the IP address after the NAT.

Configuration of the Client-Initialized VPN on the USG2000 and USG5000
The method used to configure the Client-Initialized VPN on the USG2000 and USG5000 is as follows: The LAC client can directly initiates a tunnel establishment request to the LNS bypassing the LAC. The LNS allocates an address to the LAC client. The HQ network can connect to the Internet through the LNS. An employee on a business trip can directly initiate a tunnel establishment request to the LNS by means of L2TP dialup. The L2TP client software must be installed on the PC of the employee. Configure the Client-Initialized VPN using the CLI: 1. Configure the LNS. a. Create and configure the virtual interface template. [LNS] interface virtual-template 1 [LNS-Virtual-Template1] ip address 192.168.0.1 255.255.255.0 [LNS-Virtual-Template1] ppp authentication-mode chap [LNS-Virtual-Template1] quit b. Enable the L2TP. [LNS] l2tp enable c. Create and configure the L2TP group. [LNS] l2tp-group 1 d. Configure local tunnel name on the LNS end and the received peer tunnel name. [LNS-l2tp1] tunnel name LNS [LNS-l2tp1] allow l2tp virtual-template 1 [LNS-l2tp1] tunnel authentication [LNS-l2tp1] tunnel password cipher Password123 Note: If you use the L2TP client software provided by the Windows system to dial up, you must disable the L2TP tunnel verification function. e. Define an address pool and allocate an IP address to the dial-up user. [LNS] aaa [LNS-aaa] ip pool 1 192.168.0.2 192.168.0.100 f. Set the user name and password (consistent with those configured on the PC of the employee on a business trip). [LNS-aaa] local-user vpdnuser password cipher Hello123 [LNS-aaa] quit Note: Because the addresses in the IP address pool are not in the same network segment as the intranet addresses, you need to configure the route to network segment 192.168.0.0 on the HQ device, and set the next hop address to 192.168.1.1. g. Allocate an address in the IP address pool to the peer interface. [LNS] interface virtual-template 1 [LNS-Virtual-Template1] remote address pool 1 [LNS-Virtual-Template1] quit

Method used to configure the default L2TP on the USG6000
You can configure the default L2TP on the USG6000 as follows: Enable the L2TP. Note: When the L2TP is disabled, you can still make the related configuration. However, the configuration does not take effect. Choose Network > L2TP > L2TP. In Configure L2TP, select Enable and click Apply. If the system displays information indicating a successful operation, the L2TP is normally enabled. Click New in L2TP Group List or select the default group. Note: By default, an L2TP group in LNS type exists. The default group can be modified instead of being deleted. Groups created by clicking New are not default groups. After selecting the default LNS group, if you do not specify Peer Tunnel Name, the group serves as the default LNS group. During tunnel negotiation, the LNS searches for Peer Tunnel Name of each non-default group based on the configured sequence, and matches Peer Tunnel Name with Local Tunnel Name on the LAC end. If Peer Tunnel Name of a certain L2TP group matches Local Tunnel Name on the LAC end, the L2TP group is used for negotiation and tunnel establishment. If Peer Tunnel Name of no L2TP group matches Local Tunnel Name, the default group is used for negotiation. If Peer Tunnel Name is specified for the default group, the default group becomes a non-default group. Then, the LNS has no default group. If Peer Tunnel Name of no L2TP group matches Local Tunnel Name, the LNS discards the negotiation packet and the tunnel fails to be established.

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