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Interoperation Configuration Guide

AR Router

This document provides cases for connecting AR enterprise routers to devices of other vendors.
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Example for Establishing an IPSec Tunnel Through Negotiation Initiated by the Branch Gateway with a Dynamic IP Address to the Headquarters Cisco Router (Using Dynamic Crypto Map Entry)

Example for Establishing an IPSec Tunnel Through Negotiation Initiated by the Branch Gateway with a Dynamic IP Address to the Headquarters Cisco Router (Using Dynamic Crypto Map Entry)

Specifications

This example applies to all versions and routers.

Networking Requirements

As shown in Figure 3-1, RouterA is the enterprise branch gateway, the public network interface dynamically obtains an IP address, and RouterB is the enterprise headquarters gateway (Cisco router). The branch and headquarters communicate through the public network.

The enterprise wants to protect data flows between the branch subnet and the headquarters subnet. Because the branch gateway dynamically obtains an IP address, the headquarters gateway can use the dynamic crypto map entry to establish an IPSec tunnel with the branch gateway.

Figure 3-1  Networking for establishing an IPSec tunnel through negotiation initiated by the branch gateway with a dynamic IP address to the headquarters Cisco router

Procedure

  1. Configure RouterA.

    #
     sysname RouterA  //Configure the device name.
    #
     ipsec authentication sha2 compatible enable
    #
    acl number 3000  //Specify data flows (traffic from the branch subnet to the headquarters subnet) to be protected.
     rule 5 permit ip source 10.1.1.0 0.0.0.255 destination 10.1.2.0 0.0.0.255
    #
    ipsec proposal prop1  //Configure an IPSec proposal.
     esp authentication-algorithm sha2-256
     esp encryption-algorithm aes-128
    #
    ike proposal 1  //Configure an IKE proposal.
     encryption-algorithm aes-cbc-128   //In V200R008 and later versions, the aes-cbc-128 parameter is changed to aes-128.
     dh group14
     authentication-algorithm sha2-256
    #
    ike peer peer1 v1  //The commands used to configure IKE peers and the IKE protocol differ depending on the software version. In earlier versions of V200R008, the command is ike peer peer-name [ v1 | v2 ]. In V200R008 and later versions, the command is ike peer peer-name and version { 1 | 2 }. By default, IKEv1 and IKEv2 are enabled simultaneously. An initiator uses IKEv2 to initiate a negotiation request, while a responder uses IKEv1 or IKEv2 to respond. To initiate a negotiation request using IKEv1, run the undo version 2 command.
     pre-shared-key cipher %#%#@W4p8i~Mm5sn;9Xc&U#(cJC;.CE|qCD#jAH&/#nR%#%#  //Configure the pre-shared key as huawei@1234.
     ike-proposal 1
     remote-address 60.1.2.1    //Use the IP address to identify the IKE peer.
    #
    ipsec policy policy1 10 isakmp  //Configure an IPSec policy.
     security acl 3000 
     ike-peer peer1
     proposal prop1
    #
    interface GigabitEthernet0/0/1
     ipsec policy policy1     //Apply the IPSec policy to the interface.
     ip address dhcp-alloc   //Enable the DHCP client function to allow the branch gateway to dynamically obtain an IP address. In addition, you also need to configure the DHCP 
                                server function on the device directly connected or having a reachable route to RouterA. For detailed configurations, see the product documentation
                                of the device used.
    #
    interface GigabitEthernet0/0/2
     ip address 10.1.1.1 255.255.255.0
    #
    return

  2. Configure RouterB.

    !
    hostname RouterB  //Configure the device name.
    !
    crypto isakmp policy 1
     encryption aes 128
     hash sha256
     authentication pre-share
     group 14
    crypto isakmp key huawei@1234 address 0.0.0.0 0.0.0.0  //Configure the pre-shared key as huawei@1234, use the IP address to identify an IKE peer, and configure the device to allow access from any branch.
    !
    crypto ipsec transform-set p1 esp-sha256-hmac esp-aes 128  //Configure a security algorithm used by IPSec.
    !
    !
    crypto dynamic-map p1 1  //Create a dynamic crypto map entry.
     set transform-set p1
     match address 102
    ! 
    !
    crypto map p1 1 ipsec-isakmp dynamic p1  //Configure an IPSec policy.
    !
    !
    interface GigabitEthernet0/0
     ip address 60.1.2.1 255.255.255.0
     duplex auto
     speed auto
     crypto map p1     //Apply the IPSec policy to the interface.
    !
    interface GigabitEthernet0/1
     ip address 10.1.2.1 255.255.255.0
     duplex auto
     speed auto
    !
    !
    ip route 0.0.0.0 0.0.0.0 60.1.2.2  //Configure a static route to ensure reachability at both ends.
    !
    access-list 102 permit ip 10.1.2.0 0.0.0.255 10.1.1.0 0.0.0.255 //Specify data flows (traffic from the headquarters subnet to the branch subnet) to be protected.
    !
    end

  3. Verify the configuration.

    # After the configuration is complete, run the ping command on PC A. PC B can be pinged.

    # Run the display ike sa and display ipsec sa commands on RouterA, and run the show crypto isakmp sa and show crypto ipsec sa commands on RouterB. You can see that the IPSec tunnel is created successfully.

    # Run the display ipsec statistics command on RouterA to check data packet statistics.

Configuration Notes

In this example, the commands on the Cisco router are recommended ones. The product version is Cisco IOS Software, C3900e Software (C3900e-UNIVERSALK9-M), Version 15.2(4)M1, RELEASE SOFTWARE (fc1). For details, visit http://www.cisco.com/cisco/web/support.

MD5, SHA-1, DES, and 3DES have potential security risks. Exercise caution when you use them.

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Updated: 2019-05-17

Document ID: EDOC1100034005

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