GRE VPN和MGRE VPN综合练习

• 实验拓扑

• 实验要求

1、R5为ISP，只能进行IP地址配置，其所有地址均配为公有IP地址;

2、R1和R5间使用PPP的PAP认证，R5为主认证方;

   R2与R5之间使用ppp的CHAP认证，R5为主认证方;

   R3与R5之间使用HDLC封装;

3、R1、R2、R3构建一个MGRE环境，R1为中心站点，R1、R4间为点到点的GRE;

4、整个私有网络基本RIP全网可达，

5、所有Pc设置私有IP为源IP，可以访问R5环回,达到全网通。

三、实验思路

1、对四台PC和五台路由器进行IP地址的配置

2、R1和R5间使用PPP的PAP认证，R5为主认证方 R5上配置aaa服务创建用户及密码R1在接口上选择身份验证模式PAP

3、R2与R5之间使用ppp的CHAP认证，R5为主认证方 R5上配置aaa R2在接口上选择身份验证模式CHAP

4、分别在R3R5上做HDLC封装

5、将公网内的网络实现全网通

6、R1、R2、R3构建一个MGRE环境，R1为中心站点，

7、R1、R4间为点到点的GRE

8、使用rip动态路由协议使所有私网地址和隧道地址进行路由学习

9、在R1\R2\R3\R4上做NAT地址转换技术（一对多）

四、实验步骤

1、IP地址配置

R1

[r1]int g0/0/0

[r1-GigabitEthernet0/0/0]ip add 192.168.1.254/24

[r1-GigabitEthernet0/0/0]int s3/0/0

[r1-Serial3/0/0]ip add 15.1.1.1 24

R2

[r2]int g 0/0/0

[r2-GigabitEthernet0/0/0]

[r2-GigabitEthernet0/0/0]ip add 192.168.2.254 24

[r2-GigabitEthernet0/0/0]int s 3/0/1

[r2-Serial3/0/1]ip add 25.1.1.1 24

R3

[r3]int g 0/0/0

[r3-GigabitEthernet0/0/0]ip add 192.168.3.254 24

[r3-GigabitEthernet0/0/0]int s 4/0/0

[r3-Serial4/0/0]ip add 35.1.1.1 24

R4

[r4]int g 0/0/0

[r4-GigabitEthernet0/0/0]ip add 192.168.4.254 24

[r4-GigabitEthernet0/0/0]int g 0/0/1

[r4-GigabitEthernet0/0/1]ip add 45.1.1.1 24

R5

[ISP]int Serial  3/0/0

[ISP-Serial3/0/0]ip add 15.1.1.2 24

[ISP-Serial3/0/0]int s 3/0/1

[ISP-Serial3/0/1]ip add 25.1.1.2 24

[ISP-Serial3/0/1]int s 4/0/0

[ISP-Serial4/0/0]ip add 35.1.1.2 24

[ISP-Serial4/0/0]int g 0/0/1

[ISP-GigabitEthernet0/0/1]ip add 45.1.1.2 24

[ISP-GigabitEthernet0/0/1]int l 0

[ISP-LoopBack0]ip add 5.5.5.5 24

2、R1和R5间使用PPP的PAP认证，R5为主认证方

首先需要在R5上通过aaa服务建立用户和密码，进入对应接口选择身份验证模式

[ISP]aaa  

[ISP-aaa]local-user liu password cipher 111

[ISP-aaa]local-user liu service-type ppp

[ISP]int Serial 3/0/0

[ISP-Serial3/0/0]ppp authentication-mode pap 

然后我们先不在R1上做认证，重启链路看看效果

可以看到因为R1上没做pap认证导致接口的链路层协议down

所以在R1上也要做pap认证

[r1-Serial3/0/0]ppp pap local-user liu password cipher 111

然后我们再来测试一下

这里我们可以很明显的观察到物理层和数据链路层双up

3、R2与R5之间使用ppp的CHAP认证，R5为主认证方

首先需要在R5上通过aaa服务建立用户和密码，进入对应接口选择身份验证模式

[ISP]aaa  

[ISP-aaa]local-user liu password cipher 111

[ISP-aaa]local-user liu service-type ppp

[ISP]int s 3/0/1

[ISP-Serial3/0/1]ppp authentication-mode chap

然后再R2上做chap认证

[r2]int s 3/0/1

[r2-Serial3/0/1]ppp chap user liu

[r2-Serial3/0/1]ppp chap password cipher 111

4、R3与R5之间使用HDLC封装

[ISP]int s 4/0/0

[ISP-Serial4/0/0]link-protocol hdlc

Warning: The encapsulation protocol of the link will be changed. Continue? [Y/N]

:y

[r3]int s 4/0/0

[r3-Serial4/0/0]link-protocol hdlc

Warning: The encapsulation protocol of the link will be changed. Continue? [Y/N]

:y

5、将公网内的网络实现全网通

在R1\R2\R3\R4做一条指向公网的缺省路由

[r1]ip route-static 0.0.0.0 0 15.1.1.2

[r2]ip route-static 0.0.0.0 0 25.1.1.2

[r3]ip route-static 0.0.0.0 0 35.1.1.2

[r4]ip route-static 0.0.0.0 0 45.1.1.2

6、R1、R2、R3构建一个MGRE环境，R1为中心站点，

1）首先要分别在R1\R2\R3上做隧道接口

R1

[r1]int Tunnel 0/0/0

[r1-Tunnel0/0/0]ip add 10.1.1.1 24

[r1-Tunnel0/0/0]tunnel-protocol

[r1-Tunnel0/0/0]tunnel-protocol gre p2mp

[r1-Tunnel0/0/0]source 15.1.1.1

Jul 25 2024 21:32:15-08:00 r1 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP

on the interface Tunnel0/0/0 has entered the UP state.

[r1-Tunnel0/0/0]nhrp network-id 100

R2、

[r2]int Tunnel 0/0/0

[r2-Tunnel0/0/0]ip add 10.1.1.2 24

[r2-Tunnel0/0/0]tunnel-protocol gre p2mp

[r2-Tunnel0/0/0]source Serial 3/0/1

Jul 25 2024 21:34:48-08:00 r2 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP

on the interface Tunnel0/0/0 has entered the UP state.

[r2-Tunnel0/0/0]nhrp network-id 100

[r2-Tunnel0/0/0]nhrp entry 10.1.1.1 15.1.1.1 register

R3、

[r3]int Tunnel 0/0/0

[r3-Tunnel0/0/0]ip add 10.1.1.3 24

[r3-Tunnel0/0/0]tunnel-protocol gre p2mp

[r3-Tunnel0/0/0]source Serial 4/0/0

Jul 25 2024 21:39:50-08:00 r3 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP

on the interface Tunnel0/0/0 has entered the UP state.

[r3-Tunnel0/0/0]nhrp network-id 100

[r3-Tunnel0/0/0]nhrp entry 10.1.1.1 15.1.1.1 register

2）用rip动态路由协议将私网网段搞通

[r2]rip 1

[r2-rip-1]v 2

[r2-rip-1]undo summary

[r2-rip-1]network 192.168.2.0

[r2-rip-1]network 10.0.0.0

其他同上

3）在R1上开启伪广播

[r1]int Tunnel 0/0/0

[r1-Tunnel0/0/0]nhrp entry multicast dynamic

4）关闭rip的水平分割

[r1-Tunnel0/0/0]undo rip split-horizon

7、R1、R4间为点到点的GRE

1）配置gre所需的隧道接口

[r1]int Tunnel 0/0/1

[r1-Tunnel0/0/1]ip add 10.1.2.1 24   

[r1-Tunnel0/0/1]tunnel-protocol gre       

[r1-Tunnel0/0/1]source 15.1.1.1

[r1-Tunnel0/0/1]destination 45.1.1.1

Jul 25 2024 23:27:01-08:00 r1 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP

on the interface Tunnel0/0/1 has entered the UP state.

R4

[r4]int Tunnel 0/0/1

[r4-Tunnel0/0/1]ip add 10.1.2.2 24   

[r4-Tunnel0/0/1]tunnel-protocol gre

[r4-Tunnel0/0/1]source 45.1.1.1

[r4-Tunnel0/0/1]destination 15.1.1.1

Jul 25 2024 23:28:05-08:00 r4 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP

on the interface Tunnel0/0/1 has entered the UP state.

8、所有Pc设置私有IP为源IP，可以访问R5环回,达到全网通。

1）使用NAT技术，将私网转换成公网（一对多）

2）首先需要抓取私网流量

R1

[r1]acl 2000

[r1-acl-basic-2000]rule permit source 192.168.1.0 0.0.0.255

[r1-acl-basic-2000]q

[r1]int s 3/0/0

[r1-Serial3/0/0]nat outbound 2000

R2

[r2]acl 2000   

[r2-acl-basic-2000]rule permit source 192.168.2.0 0.0.0.255

[r2-acl-basic-2000]q

[r2]int s 3/0/1

[r2-Serial3/0/1]nat outbound 2000

R3

[r3]acl 2000

[r3-acl-basic-2000]rule permit source 192.168.3.0 0.0.0.255

[r3-acl-basic-2000]q

[r3]int s 4/0/0

[r3-Serial4/0/0]nat outbound 2000

R4

[r4]acl 2000

[r4-acl-basic-2000]rule permit source 192.168.4.0 0.0.0.255

[r4-acl-basic-2000]q

[r4]int g 0/0/1

[r4-GigabitEthernet0/0/1]nat outbound 2000

测试：