实验目标：

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. 整个私有网络基于RIP全网可达
5. 所有PC设置私有IP为源IP，可以访问R5环回。
 

实验思路：

配置DHCP获取地址
R1和R5之间hdlc封装
PPP封装，pap认证R5 上做主认证方
双向认证 水平分割 rip宣告
tunnel协议进行隧道封装，构建MGRE环境
在r1,r2,r3,r4上配置nat
 

实验配置：

R1

[r1]int s4/0/0
[r1-Serial4/0/0]ip ad	
[r1-Serial4/0/0]ip address 15.0.0.1 24
[r1-Serial4/0/0]int g0/0/0
[r1-GigabitEthernet0/0/0]ip address 192.168.1.1 24

R2

[r2]int g0/0/0
[r2-GigabitEthernet0/0/0]ip add 192.168.2.1 24
[r2-GigabitEthernet0/0/0]int s4/0/0
[r2-Serial4/0/0]ip add 25.0.0.1 24

 R3

[r3]int g0/0/0
[r3-GigabitEthernet0/0/0]ip add 192.168.3.1 24
[r3-GigabitEthernet0/0/0]int s4/0/0
[r3-Serial4/0/0]ip add 35.0.0.1 24

 R4

[r4]int g0/0/0
[r4-GigabitEthernet0/0/0]ip add 45.0.0.1 24
[r4-GigabitEthernet0/0/0]int g0/0/1
[r4-GigabitEthernet0/0/1]ip add 192.168.4.1 24

R5

[r5]int s4/0/0
[r5-Serial4/0/0]ip add 15.0.0.2 24
[r5-Serial4/0/0]int s4/0/1
[r5-Serial4/0/1]ip add 25.0.0.2 24
[r5-Serial4/0/1]int s3/0/0
[r5-Serial3/0/0]ip add 35.0.0.2 24
[r5-Serial3/0/0]int g0/0/0
[r5-GigabitEthernet0/0/0]ip add 45.0.0.2 24
[r5-GigabitEthernet0/0/0]int l0
[r5-LoopBack0]ip add 5.5.5.5 24

创建缺省路由

[R1]ip route-static 0.0.0.0 0 15.0.0.2
[R2]ip route-static 0.0.0.0 0 25.0.0.2 
[R3]ip route-static 0.0.0.0 0 35.0.0.2
[R4]ip route-static 0.0.0.0 0 45.0.0.2

 R5认证

[r5]aaa
[r5-aaa]local-user ppx password cipher 123456
[r5-aaa]local-user ppx service-type ppp
[r5]int s 4/0/0
[r5-Serial4/0/0]ppp authentication-mode pap

r1被认证

[r1]int s 4/0/0
[r1-Serial4/0/0]ppp pap local-user ppx password cipher 123456

R2与R5之间使用PPP的chap认证，R5为主认证方；

[R5]int s 4/0/1
[R5-Serial4/0/1]ppp authentication-mode chap 

[R2]int s 4/0/0
[R2-Serial4/0/0]ppp chap user ppx
[R2-Serial4/0/0]ppp chap password cipher 123456

R3与R5之间使用HDLC封装

[R5]int s 3/0/0
[R5-Serial3/0/0]link-protocol hdlc 

[R3]int Serial 4/0/0
[R3-Serial4/0/0]link-protocol hdlc 

R1

[R1]int Tunnel 0/0/0
[R1-Tunnel0/0/0]ip address 192.168.5.1 24
[R1-Tunnel0/0/0]tunnel-protocol gre p2mp 
[R1-Tunnel0/0/0]source 15.0.0.1
[R1-Tunnel0/0/0]nhrp network-id 100

r2

[R2]interface Tunnel 0/0/0
[R2-Tunnel0/0/0]ip address 192.168.5.2 24
[R2-Tunnel0/0/0]tunnel-protocol gre p2mp 
[R2-Tunnel0/0/0]source Serial 4/0/0
[R2-Tunnel0/0/0]nhrp network-id 100
[R2-Tunnel0/0/0]nhrp entry 192.168.5.1 15.0.0.1 register 

r3

[R3]int Tunnel 0/0/0
[R3-Tunnel0/0/0]ip add 192.168.5.3 24
[R3-Tunnel0/0/0]tunnel-protocol gre p2mp 
[R3-Tunnel0/0/0]source Serial 4/0/0
[R3-Tunnel0/0/0]nhrp network-id 100
[R3-Tunnel0/0/0]nhrp entry 192.168.5.1 15.0.0.1 register 

 配置路由信息

[r1]rip 1
[r1-rip-1]version 2
[r1-rip-1]network 192.168.1.0
[r1-rip-1]network 192.168.5.0

[r2]rip 1
[r2-rip-1]version 2
[r2-rip-1]network 192.168.2.0
[r2-rip-1]network 192.168.5.0

[r3]rip 1
[r3-rip-1]version 2
[r3-rip-1]network 192.168.3.0
[r3-rip-1]network 192.168.5.0

开启伪广播,关闭RIP的水平分割

[r1]interface Tunnel 0/0/0
[r1-Tunnel0/0/0]nhrp entry multicast dynamic 
[r1-Tunnel0/0/0]undo rip split-horizon 

GRE配置：

[r1]interface Tunnel 0/0/1
[r1-Tunnel0/0/1]ip add 192.168.6.1 24
[r1-Tunnel0/0/1]tunnel-protocol gre 
[r1-Tunnel0/0/1]source 15.0.0.1
[r1-Tunnel0/0/1]destination 45.0.0.1
[r1]rip 1
[r1-rip-1]network 192.168.6.0

[r4]interface Tunnel 0/0/1
[r4-Tunnel0/0/1]ip add 192.168.6.2 24
[r4-Tunnel0/0/1]tunnel-protocol gre 
[r4-Tunnel0/0/1]source 45.0.0.1 
[r4-Tunnel0/0/1]destination 15.0.0.1
[r4]rip 1
[r4-rip-1]version 2
[r4-rip-1]network 192.168.6.0
[r4-rip-1]network 192.168.4.0

所有PC设置私有IP为源IP，可以访问R5环回。

[R1]acl 2000
[R1-acl-basic-2000]rule permit source 192.168.1.0 0.0.0.255
[R1]interface Serial 4/0/0
[R1-Serial4/0/0]nat outbound 2000

[R2]acl 2000
[R2-acl-basic-2000]rule permit source 192.168.2.0 0.0.0.255
[R2]interface Serial 4/0/0
[R2-Serial4/0/0]nat outbound 2000

[R3]acl 2000
[R3-acl-basic-2000]rule permit source 192.168.3.0 0.0.0.255
[R3]interface Serial 4/0/0
[R3-Serial4/0/0]nat outbound 2000

[R4]acl 2000
[R4-acl-basic-2000]rule permit source 192.168.4.0 0.0.0.255
[R4]interface GigabitEthernet 0/0/1
[R4-GigabitEthernet0/0/1]nat outbound 2000