Method used to configure L2TP over IPSec on the USG6000 series

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Due to protocol characteristics, the traditional L2TP has potential security risks. The L2TP over IPSec mechanism encapsulates packets based on the L2TP and then the IPSec. In this way, the L2TP over IPSec mechanism integrates advantages of two types of VPNs, implements user authentication and address allocation based on the L2TP, and makes up the disadvantages of the IPSec in terms of user authentication and authorization.

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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

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.

GRE over IPSec configuration on the USG6000
GRE over IPSec VPN configuration on the USG6000 Configuration procedure: 1. Complete basic interface configuration, for example, configuring the IP address and adding the physical port to the related zone. 2. Enable the inter-zone security policy. 2. Configure the IPSec tunnel. Set the source and destination addresses of the sensitive traffic carried by the IPSec tunnel to the source and destination addresses of the GRE tunnel. 2. Configure the GRE tunnel. Set the source and destination addresses of the GRE tunnel to the source and destination addresses of the sensitive traffic carried by the IPSec tunnel. Configuration example: Topology: Network A-----(10.1.1.1) NGFW_A-----INTERNET-----NGFW_B (10.1.2.1)------Network B Note: a. Network A (10.1.1.0/24) and network B (10.1.2.0/24) can mutually access each other. b. The public IP address of NGFW_A is 1.1.3.1, the public IP address of NGFW_B is 1.1.5.1, and the public route is accessible. c. The GRE over IPSec tunnel established between NGFW_A and NGFW_B can satisfy the IPSec security requirements and also transmit broadcast or multicast packets based on GRE. 1. Complete basic interface configuration, for example, configuring the IP address and adding the interface to the related zone. 2. Configure the IPSec. //Configure IPSec sensitive traffic.// [USG_A]acl 3000 [USG_A-acl-adv-3000]rule 5 permit ip source 1.1.3.1 0.0.0.0 destination 1.1.5.1 0.0.0.0 [USG_B]acl 3000 [USG_B-acl-adv-3000]rule 5 permit ip source 1.1.5.1 0.0.0.0 destination 1.1.3.1 0.0.0.0 //Configure the IKE proposal and IPSec proposal. Adopt the default parameters.// [USG_A-1]ike proposal 1 [USG_A-1-ike-proposal-1]quit [USG_A-1]ipsec proposal 1 [USG_A-1-ipsec-proposal-1]quit [USG_B-1]ike proposal 1 [USG_B-1-ike-proposal-1]quit [USG_B-1]ipsec proposal 1 [USG_B-1-ipsec-proposal-1]quit //Configure the IKE peer.// [USG_A-1]ike peer 1 [USG_A-1-ike-peer-1]pre-shared-key 123456 [USG_A-1-ike-peer-1]ike-proposal 1 [USG_A-1-ike-peer-1]remote-address 1.1.5.1 [USG_B-1]ike peer 1 [USG_B-1-ike-peer-1]pre-shared-key 123456 [USG_B-1-ike-peer-1]ike-proposal 1 [USG_B-1-ike-peer-1]remote-address 1.1.3.1 //Configure IPSec policies.// [USG_A-1]ipsec policy p1 1 isakmp [USG_A-1-ipsec-policy-isakmp-1-1] security acl 3000 [USG_A-1-ipsec-policy-isakmp-1-1]Ike peer 1 [USG_A-1-ipsec-policy-isakmp-1-1]proposal 1 [USG_A-1-ipsec-policy-isakmp-1-1]local-address 1.1.3.1 [USG_A-1-ipsec-policy-isakmp-1-1] interface GigabitEthernet1/0/1 [USG_A-1-GigabitEthernet1/0/1] ipsec policy p1 auto-neg [USG_B-1]ipsec policy p1 1 isakmp [USG_B-1-ipsec-policy-isakmp-1-1]security acl 3000 [USG_B-1-ipsec-policy-isakmp-1-1]Ike peer 1 [USG_B-1-ipsec-policy-isakmp-1-1]proposal 1 [USG_B-1-ipsec-policy-isakmp-1-1]local-address 1.1.5.1 [USG_B-1-ipsec-policy-isakmp-1-1] interface GigabitEthernet1/0/1 [USG_B-1-GigabitEthernet1/0/1] ipsec policy p1 auto-neg 3. Configure the GRE tunnel. [USG_A-1]interface Tunnel 0 [USG_A-1-Tunnel0] ip address 10.3.1.1 255.255.255.0 [USG_A-1-Tunnel0]tunnel-protocol gre [USG_A-1-Tunnel0] source 1.1.3.1 [USG_A-1-Tunnel0] destination 1.1.5.1 [USG_B-1]interface Tunnel 0 [USG_B-1-Tunnel0] ip address 10.3.1.2 255.255.255.0 [USG_B-1-Tunnel0]tunnel-protocol gre [USG_B-1-Tunnel0] source 1.1.5.1 [USG_B-1-Tunnel0] destination 1.1.3.1 4. Add the GRE tunnel to the security zone and configure a tunnel route. [USG_A-1]firewall zone untrust [USG_A-1-zone-untrust]add interface Tunnel 0 [USG_A-1]ip route-static ip route-static 10.1.2.0 255.255.255.0 Tunnel0 [USG_B-1]firewall zone untrust [USG_B-1-zone-untrust]add interface Tunnel 0 [USG_B-1]ip route-static ip route-static 10.1.1.0 255.255.255.0 Tunnel0

Whether the IPSec in L2TP over IPSec mode can use the main mode on the USG6000
The IPSec can use the main mode. The VPN client can use the main mode for interconnection on the USG NGFWC20SPC700.

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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