防火墙VPN

客户需要通过IPSEC OVER L2TP实现对LAC和LNS之间的数据进行加密

MSRV7设备作为LAC和MSRV5的LNS设备建立L2TP。IPSEC保护的数据流为LAC的192.168.2.0/24和LNS 192.168.1.0/24。LAC和LNS都是手动配置L2TP隧道地址，LAC为10.0.0.2，LNS为10.0.0.1。LAC的公网IP为40.0.0.254，LNS的公网IP为30.0.0.254。

MSRV7(LAC)

1       配置L2TP

#

 l2tp enable            //开启L2TP

#

l2tp-group 1 mode lac

 lns-ip 30.0.0.254       //配置LNS的IP地址

 undo tunnel authentication   //关闭隧道认证

#

interface Virtual-PPP1

 ppp chap password cipher $c$3$jC1BLtrp78KwIF6CLV5VpjySyQ24tw== 

 ppp chap user ppp

 ip address 10.0.0.2 255.255.255.0   //配置隧道口地址为10.0.0.2

 l2tp-auto-client l2tp-group 1         //触发LAC自动建立隧道

#

 ip route-static 192.168.1.0 24 Virtual-PPP1   //配置去往对端的路由

2       配置IPSEC

#

ike keychain 1

 pre-shared-key address 0.0.0.0 0.0.0.0 key cipher $c$3$E4P89BOZeRoKjfxLAXY78zxyOEb40A==     //配置预共享密钥

#

ike profile 1       //配置IKE profile

 keychain 1       //调用keychain

 exchange-mode aggressive    //配置野蛮模式

 local-identity fqdn zongbu      //配置本端的fqdn为总部

 match remote identity fqdn fenzhi   //配置对端的fqdn为分支

#

ipsec transform-set 1     //配置IPSEC 安全提议

 esp encryption-algorithm 3des-cbc

 esp authentication-algorithm md5

#

acl advanced 3000

 rule 0 permit ip source 192.168.2.0 0.0.0.255 destination 192.168.1.0 0.0.0.255   //创建ACL匹配IPSEC的数据流

#

ipsec policy a 10 isakmp    //创建IPSEC策略

 transform-set 1

 security acl 3000

 remote-address 10.0.0.1   //指定对端地址，为l2tp隧道地址

 ike-profile 1

#

interface Virtual-PPP1

 ipsec apply policy a     //virtual-ppp接口调用IPSEC策略

MSRV5（LNS）

1       配置L2TP

#

 l2tp enable     //开启L2TP

#

interface Virtual-Template1    //创建VT接口

 ppp authentication-mode chap

 ip address 10.0.0.1 255.255.255.0    //配置隧道地址为10.0.0.1

#

l2tp-group 1     //创建L2TP组1

 undo tunnel authentication      //关闭隧道认证

 allow l2tp virtual-template 1

#

local-user ppp   //创建LAC的认证的PPP账户

 password cipher $c$3$LATxqwpC5lJ3WPt8nCmiJVpV/eOpjw==

 service-type ppp

#

ip route-static 192.168.2.0 255.255.255.0 10.0.0.2    //配置去往LAC内网的路由

2   配置IPSEC

#

ike peer 1        //配置IKE对等体

 exchange-mode aggressive   //配置模式为野蛮模式

 pre-shared-key cipher $c$3$DWPZCGSWERWpN/fbqXSS+l83qQ9/gg==

 id-type name    //指定ID类型为name类型

 remote-name zongbu    //指定对端名称为zongbu

 remote-address 10.0.0.2   //指定对端地址为L2TP隧道地址10.0.0.2

 local-name fenzhi    //配置本端名称fenzhi

#

ipsec transform-set 1      //创建IPSEC安全提议

 esp authentication-algorithm md5

 esp encryption-algorithm 3des

#

acl number 3000

 rule 0 permit ip source 192.168.1.0 0.0.0.255 destination 192.168.2.0 0.0.0.255      //创建ACL匹配IPSEC数据流

#           

ipsec policy a 10 isakmp       //配置IPSEC安全策略

 security acl 3000

 ike-peer 1

 transform-set 1

#

interface Virtual-Template1

 ipsec policy a      //在VT接口引用策略

流量触发后可以建立成功。

<H3C>dis ipsec sa

-------------------------------

Interface: Virtual-PPP1

-------------------------------

  -----------------------------

  IPsec policy: a

  Sequence number: 10

  Mode: ISAKMP

  -----------------------------

    Tunnel id: 0

    Encapsulation mode: tunnel

    Perfect Forward Secrecy:

    Inside VPN:

    Extended Sequence Numbers enable: N

    Traffic Flow Confidentiality enable: N

    Path MTU: 1444

    Tunnel:

        local  address: 10.0.0.2

        remote address: 10.0.0.1

    Flow:

        sour addr: 192.168.2.0/255.255.255.0  port: 0  protocol: ip

        dest addr: 192.168.1.0/255.255.255.0  port: 0  protocol: ip

    [Inbound ESP SAs]

      SPI: 2790206877 (0xa64f2d9d)

      Connection ID: 21474836481

      Transform set: ESP-ENCRYPT-3DES-CBC ESP-AUTH-MD5

      SA duration (kilobytes/sec): 1843200/3600

      SA remaining duration (kilobytes/sec): 1843199/3428

      Max received sequence-number: 4

      Anti-replay check enable: Y

      Anti-replay window size: 64

      UDP encapsulation used for NAT traversal: N

      Status: Active

    [Outbound ESP SAs]

      SPI: 4121513637 (0xf5a94ea5)

      Connection ID: 12884901888

      Transform set: ESP-ENCRYPT-3DES-CBC ESP-AUTH-MD5

      SA duration (kilobytes/sec): 1843200/3600

      SA remaining duration (kilobytes/sec): 1843199/3428

      Max sent sequence-number: 4

      UDP encapsulation used for NAT traversal: N

      Status: Active

<H3C>display l2tp session

LocalSID    RemoteSID    LocalTID    State

58094       12555        31353       Established

1.两边的IPSEC指定的对端地址都是L2TP的隧道地址。

2.配置同样适用于PPPOE拨号和IP地址不固定的LAC