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L2TP的LAC拨号模式实验

news 来源：原创 2025/5/18 15:06:21

一，实验拓扑

二，实验配置

L2TP配置

1、建立PPPoE连接，设定拨号接口VT接口

Client

[PPPoE Client]interface Dialer 1
[PPPoE Client-Dialer1]dialer user user1 ----- 设定拨号用户名
[PPPoE Client-Dialer1]dialer-group 1 ---- 创建拨号组
[PPPoE Client-Dialer1]dialer bundle 1 ------ 设定拨号程序捆绑包
[PPPoE Client-Dialer1]ip address ppp-negotiate ------ 设定IP地址获取方式为PPP邻居分配，PPP邻居通过IPCP协议进行分配，即PPP的NCP协商过程所用协议
[PPPoE Client-Dialer1]ppp chap user user1
[PPPoE Client-Dialer1]ppp chap password cipher Password123

[PPPoE Client]dialer-rule 1 ip permit ------ 配置拨号访问控制列表，允许所有IPv4报文通过拨号口，数字1必须与拨号组编号相同。

[PPPoE Client]int g 1/0/0
[PPPoE Client-GigabitEthernet1/0/0]pppoe-client dial-bundle-number 1 ---在物理接口上启动PPPoE Client程序，绑定拨号程序包，编号为1

Server

[NAS]interface Virtual-Template 1
[NAS-Virtual-Template1]ppp authentication-mode chap ----- 修改认证模式
[NAS-Virtual-Template1]ip address 2.2.2.2 24 ---- （配置的IP地址仅是为了激活该接口）

[NAS]firewall zone dmz
[NAS-zone-dmz]add interface Virtual-Template 1

[NAS]interface GigabitEthernet 1/0/0
[NAS-GigabitEthernet1/0/0]pppoe-server bind virtual-template 1 ----- 将VT接口绑定在物理接口

[NAS]aaa
[NAS-aaa]domain default
[NAS-aaa-domain-default]service-type l2tp ----- 设定认证域的服务类型为L2TP

设定用户名和密码信息：
[NAS]user-manage user user1 domain default
[NAS-localuser-user1]password Password123

2、建立L2TP隧道

NAS(LAC)配置

[NAS]l2tp enable ----- 启动L2TP协议
[NAS]l2tp-group 1 ----- 设置L2TP组名
[NAS-l2tp-1]tunnel authentication ----- 开启隧道认证
[NAS-l2tp-1]tunnel password cipher Hello123 ---- 配置隧道密码信息
[NAS-l2tp-1]tunnel name lac ----- 设置隧道名称
[NAS-l2tp-1]start l2tp ip 20.1.1.2 fullusername user1 ---- 设定LAC模式和LNS地址，以及设置认证用户的方式为“完全用户认证”，并指定用户名

LNS配置

[LNS]ip pool l2tp --- 创建地址池
[LNS-ip-pool-l2tp]section 0 172.16.1.2 172.16.1.100

[LNS]aaa
[LNS-aaa]service-scheme l2tp
[LNS-aaa-service-l2tp]ip-pool l2tp
[LNS-aaa]domain default
[LNS-aaa-domain-default]service-type l2tp

[LNS]user-manage user user1 domain default
[LNS-localuser-user1]password Password123

[LNS]interface Virtual-Template 1
[LNS-Virtual-Template1]ppp authentication-mode chap
[LNS-Virtual-Template1]ip address 172.16.0.1 24
[LNS-Virtual-Template1]remote service-scheme l2tp

[LNS]firewall zone dmz
[LNS-zone-dmz]add interface Virtual-Template 1

[LNS]l2tp enable
[LNS]l2tp-group 1
[LNS-l2tp-1]allow l2tp virtual-template 1 remote lac domain default
[LNS-l2tp-1]tunnel authentication
[LNS-l2tp-1]tunnel password cipher Hello123

3、路由补充

[PPPoE Client]ip route-static 0.0.0.0 0 Dialer 1 ---- 出接口方式

# 将Dialer 1接口划分到dmz区域，方便发包：
[PPPoE Client]firewall zone dmz
[PPPoE Client-zone-dmz]add interface Dialer 1

安全策略配置

NAS

[NAS]security-policy
[NAS-policy-security]default action deny ----- 先恢复默认策略为拒绝
[NAS-policy-security]rule name local_to_untrust
source-zone local
destination-zone untrust
source-address 20.1.1.1 mask 255.255.255.255
destination-address 20.1.1.2 mask 255.255.255.255
service l2tp
service protocol udp source-port 0 to 65535 destination-port 1701
action permit

LNS

[LNS]security-policy
[LNS-policy-security]default action deny
[LNS-policy-security]dis this
security-policy
rule name untrust_to_local
source-zone untrust
destination-zone local
source-address 20.1.1.1 mask 255.255.255.255
destination-address 20.1.1.2 mask 255.255.255.255
service l2tp
service protocol udp destination-port 1701
action permit
rule name dmz_to_trust
source-zone dmz
destination-zone trust
source-address 172.16.1.0 mask 255.255.255.0
destination-address 192.168.1.0 mask 255.255.255.0
action permit