Whether the IPSec in L2TP over IPSec mode can use the main mode on the USG6000

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The IPSec can use the main mode. The VPN client can use the main mode for interconnection on the USG NGFWC20SPC700.

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Configuration of L2TP over IPSec on the USG6000
Configuration of L2TP over IPSec on the USG6000 Configuration procedure: 1. Complete basic interface configuration, security policy configuration, and route configuration. 2. Configure and apply the IPSec. Note that the source and destination addresses of the data flow protected by the IPSec are the source and destination addresses of the sensitive traffic transmitted over the external interfaces of two gateways. 3. Configure the L2TP and L2TP tunnel source. For details, click Huawei Security Forum USG6000 L2TP over IPSec Configuration Cases. Procedure 1. Configure the IP address of each interface, and add the interfaces to the security zone. The specific configuration procedure is not described here. 2. Enable the inter-zone security policy. e map_temp [NGFW_A] interface GigabitEthernet 1/0/1 [NGFW_A-GigabitEthernet 1/0/1] ipsec policy map1 [NGFW_B] ipsec policy map1 10 isakmp [NGFW_B-ipsec-policy-isakmp-map1-10] security acl 3000 [NGFW_B-ipsec-policy-isakmp-map1-10] proposal tran1 [NGFW_B-ipsec-policy-isakmp-map1-10] ike-peer b [NGFW_B] interface GigabitEthernet 1/0/1 [NGFW_B-GigabitEthernet1/0/1] ipsec policy map1 5. Configure the L2TP. A. (LNS end) Configure the L2TP. [NGFW_A] user-manage user l2tpuser //Configure the L2TP user. [NGFW_A-localuser-l2tpuser] password Password1 [NGFW_A-localuser-l2tpuser] quit [NGFW_A] l2tp enable //Enable the L2TP. [NGFW_A] aaa [NGFW_A-aaa] ip pool 0 192.168.0.2 192.168.0.99 //Configure the IP address pool. [NGFW_A] interface Virtual-Template 1 //Configure the virtual template interface. [NGFW_A-Virtual-Template1] ppp authentication-mode pap [NGFW_A-Virtual-Template1] ip address 1.1.1.2 255.255.255.0 [NGFW_A-Virtual-Template1] remote address pool 0 //Set the virtual interface to reference the address pool used to allocate addresses to the peer end. [NGFW_A] l2tp-group 1 //Create the L2TP group. [NGFW_A-l2tp1] allow l2tp virtual-template 1 [NGFW_A-l2tp1] tunnel password cipher Pass1234 B. Configure the L2TP. # Configure the L2TP user. [NGFW_B] user-manage user l2tpuser [NGFW_B-localuser-l2tpuser] password Password1 [NGFW_B-localuser-l2tpuser] quit Configure the L2TP. [NGFW_B] l2tp enable [NGFW_B] interface Virtual-Template 1 [NGFW_B-Virtual-Template1] ppp authentication-mode pap [NGFW_B-Virtual-Template1] quit [NGFW_B] interface GigabitEthernet 1/0/3 [NGFW_B-GigabitEthernet1/0/3] pppoe-server bind virtual-template 1 [NGFW_B-GigabitEthernet1/0/3] quit [NGFW_B] l2tp-group 1 [NGFW_B-l2tp1] tunnel password cipher Pass1234 [NGFW_B-l2tp1] start l2tp ip 1.1.3.1 fullusername l2tpuser [NGFW_B-l2tp1] quit

Whether the USG can control a device's access to L2TP over IPSec
Across-Layer-3 MAC identification cannot be implemented on the public network. Usually, only users whose access is permitted are told the user name and password. This cannot be controlled on the device.

Method used to configure L2TP over IPSec on the AR
L2TP over IPSec can be used to ensure secure communication between the branch and headquarters. This function is applicable to all versions and models of AR series routers. L2TP over IPSec can be used to ensure secure communication between the LAC and LNS. For details, see Configuration Guide-VPN.

Method used to configure the L2TP over IPSec user address segment on the USG2000 and USG5000
The method used to configure the L2TP over IPSec user address segment on the USG2000 and USG5000 is as follows: Configure the L2TP over IPSec user address segment using the CLI: # Define an address pool and allocate an IP address to the dial-up user. [LNS] aaa [LNS-aaa] ip pool 1 10.1.1.1 10.1.1.100 # 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 # 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 Configure the L2TP over IPSec user address segment using the web UI: Configure the L2TP parameters. 1. Choose Network > L2TP > L2TP. 2. In Configure L2TP, select Enable and click Apply. 3. In L2TP Group List, click New. 4. Set Group Type to LNS. 5. Configure the L2TP parameters. The server address shall be in the same network segment as the address in the address pool. In this way, you do not need to configure a route. Peer Tunnel Name must be consistent with Local Tunnel Name configured on the LAC. Group Type: LNS Peer Tunnel Name: LAC Tunnel Password Authentication: Enable Password Type: Ciphertext Tunnel password: Hello123 Confirm Tunnel password: Hello123 User Group: default Set the user address allocation parameters as follows: Server Address/Subnet Mask: 10.2.1.1/255.255.255.0 User Address Pool: 10.2.1.2-10.2.1.100 6. Click OK.

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