L2TP VPN典型组网配置案例2（独立LAC模式）

第一阶段调试（基础网络配置）：

LAC：

<H3C>sys

System View: return to User View with Ctrl+Z.

[H3C]sysname LAC

[LAC]local-user weijianing class network

New local user added.

[LAC-luser-network-weijianing]password simple weijianing

[LAC-luser-network-weijianing]service-type ppp

[LAC-luser-network-weijianing]quit

[LAC]domain name system

[LAC-isp-system]authentication ppp local

[LAC-isp-system]quit

[LAC]ip pool weijianing 192.168.10.2 192.168.10.254

[LAC]int Virtual-Template 1

[LAC-Virtual-Template1]ip address 192.168.10.1 255.255.255.0

[LAC-Virtual-Template1]ppp authentication-mode pap domain system

[LAC-Virtual-Template1]remote address pool weijianing

[LAC-Virtual-Template1]quit

[LAC]int gi 0/0

[LAC-GigabitEthernet0/0]pppoe-server bind virtual-template 1

[LAC-GigabitEthernet0/0]quit

[LAC]acl basic 2000

[LAC-acl-ipv4-basic-2000]rule 0 permit source any

[LAC-acl-ipv4-basic-2000]quit

[LAC]int gi 0/1

[LAC-GigabitEthernet0/1]des <connect to ISP>

[LAC-GigabitEthernet0/1]ip address 202.1.100.2 30

[LAC-GigabitEthernet0/1]nat outbound 2000

[LAC-GigabitEthernet0/1]quit

[LAC]ip route-static 0.0.0.0 0.0.0.0 202.1.100.1

ISP：

<H3C>sys

System View: return to User View with Ctrl+Z.

[H3C]sysname ISP

[ISP]int gi 0/0

[ISP-GigabitEthernet0/0]des <connect to LAC>

[ISP-GigabitEthernet0/0]ip address 202.1.100.1 30

[ISP-GigabitEthernet0/0]quit

[ISP]int gi 0/1

[ISP-GigabitEthernet0/1]des <connect to LNS>

[ISP-GigabitEthernet0/1]ip address 202.2.100.1 30

[ISP-GigabitEthernet0/1]quit

[ISP]

LNS：

<H3C>sys

System View: return to User View with Ctrl+Z.

[H3C]sysname LNS

[LNS]vlan 100

[LNS-vlan100]quit

[LNS]int vlan 100

[LNS-Vlan-interface100]ip address 172.16.100.1 24

[LNS-Vlan-interface100]quit

[LNS]int gi 0/0

[LNS-GigabitEthernet0/0]port link-mode bridge

[LNS-GigabitEthernet0/0]port link-type access

[LNS-GigabitEthernet0/0]port access vlan 100

[LNS-GigabitEthernet0/0]quit

[LNS]acl basic 2000

[LNS-acl-ipv4-basic-2000]rule 0 permit source any

[LNS-acl-ipv4-basic-2000]quit

[LNS]int gi 0/1

[LNS-GigabitEthernet0/1]des <connect to ISP>

[LNS-GigabitEthernet0/1]ip address 202.2.100.2 30

[LNS-GigabitEthernet0/1]nat outbound 2000

[LNS-GigabitEthernet0/1]quit

[LNS]ip route-static 0.0.0.0 0.0.0.0 202.2.100.1

[LNS]

第一阶段测试：

内网1的终端进行PPPOE宽带拨号：

内网2的终端填写IP地址：

内网1的终端能PING通内网2出口设备的外网地址，但是PING不同内网2的内网地址：

内网2的终端能PING内网1的外网地址，PING不同内网1的内网地址：

第二阶段调试（L2TP配置）：

LAC关键配置点：

[LAC]local-user james class network

New local user added.

[LAC-luser-network-james]password simple james

[LAC-luser-network-james]service-type ppp

[LAC-luser-network-james]quit

[LAC]l2tp-group 1 mode lac

[LAC-l2tp1]tunnel name LAC

[LAC-l2tp1]user fullusername james

[LAC-l2tp1]tunnel authentication

[LAC-l2tp1]tunnel password simple james

[LAC-l2tp1]source-ip 202.1.100.2

[LAC-l2tp1]lns-ip 202.2.100.2

[LAC-l2tp1]quit

LAC端发起L2TP链接的关键配置：

[LAC]int Virtual-ppp 1

[LAC-Virtual-PPP1]ip address ppp-negotiate

[LAC-Virtual-PPP1]ppp chap user james

[LAC-Virtual-PPP1]ppp chap password simple james

[LAC-Virtual-PPP1]l2tp-auto-client l2tp-group 1

[LAC-Virtual-PPP1]quit

[LAC]ip route-static 172.16.100.0 255.255.255.0 Virtual-PPP 1  //配置静态路由指向到LNS内部的网段，通过L2TP VPN转发

LNS关键配置点：

[LNS]local-user james class network

New local user added.

[LNS-luser-network-james]password simple james

[LNS-luser-network-james]service-type ppp

[LNS-luser-network-james]quit

[LNS]domain name system

[LNS-isp-system]authentication ppp local

[LNS-isp-system]quit

[LNS]ip pool james 172.16.10.2 172.16.10.250

[LNS]ip pool james gateway 172.16.10.1

[LNS]l2tp enable

[LNS]int Virtual-Template 1

[LNS-Virtual-Template1]ip address 172.16.10.1 255.255.255.0

[LNS-Virtual-Template1]ppp authentication-mode chap domain system

[LNS-Virtual-Template1]remote address pool james

[LNS-Virtual-Template1]quit

[LNS]l2tp-group 1 mode lns

[LNS-l2tp1]tunnel name LNS

[LNS-l2tp1]allow l2tp virtual-template 1 remote LAC

[LNS-l2tp1]tunnel authentication

[LNS-l2tp1]tunnel password simple james

[LNS-l2tp1]quit

第二阶段测试：

分别在LAC和LNS查看L2TP的隧道信息和会话信息：

内网1的终端能PING通内网2的终端

因为LAC拨号过来以后使用的是LNS分配的IP地址，所以内网2 PING的是在LNS分配后的IP地址,由于只有一个隧道，因此分配的IP地址为172.16.10.2

至此，L2TP VPN典型组网配置案例2（独立LAC模式）已完成！