一、实验需求
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于R5之间使用ppp的chap认证，R5为主认证方；
? ? ? R3于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
二、配置思路
广播域
根据广播域划分网段
配置IP
路由? 指向ISP的缺省路由
按需求配置
三、配置命令
1，配置IP?
[r1-GigabitEthernet0/0/0]ip address 192.168.1.1 24
[r1-Serial4/0/0]ip address 15.0.0.1 24
[r2-GigabitEthernet0/0/0]ip address 192.168.2.1 24
[r2-Serial4/0/0]ip address 25.0.0.1 24
[r3-GigabitEthernet0/0/0]ip address 192.168.3.1 24
[r3-Serial4/0/0]ip address 35.0.0.1 24
[r4-GigabitEthernet0/0/0]ip address 45.0.0.1 24
[r4-GigabitEthernet0/0/1]ip address 192.168.4.1 24
[ISP-Serial3/0/0]ip address 15.0.0.2 24
[ISP-Serial3/0/1]ip address 25.0.0.2 24
[ISP-Serial4/0/0]ip address 35.0.0.2 24
[ISP-GigabitEthernet0/0/0]ip address 45.0.0.2 24
[ISP-LoopBack0]ip address 5.5.5.5 24
2，配置缺省，指向ISP
[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
3，R1和 R5间使用ppp的pap认证，R5为主认证方； （一次性对话，注意开启shutdown测试）
[ISP-aaa]local-user ri password cipher 123
[ISP-aaa]local-user r1 service-type ppp
[ISP-Serial3/0/0]ppp authentication-mode pap
4， R2于R5之间使用ppp的chap认证，R5为主认证方；?
[ISP-aaa]local-user r2 password cipher 456
[ISP-aaa]local-user r2 service-type ppp
[ISP-Serial3/0/1]ppp authentication-mode chap
[r2-Serial4/0/0]ppp chap user r2
[r2-Serial4/0/0]ppp chap password cipher 456
5，R3于R5之间使用HDLC封装
[r3]interface s4/0/0
[r3-Serial4/0/0]link-protocol hdlc[ISP]interface s4/0/0
[ISP-Serial4/0/0]link-protocol hdlc
6、R1/R2/R3构建一个MGRE环境，R1为中心站点
中心：
[r1]interface 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
分支：?
[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 entry 192.168.5.1 15.0.0.1 register?
[r3]interface tunnel 0/0/0
[r3-Tunnel0/0/0]ip address 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 entry 192.168.5.1 15.0.0.1 register
7、R1,R4间为点到点的GRE?
[r1]interface tunnel 0/0/1
[r1-Tunnel0/0/1]ip address 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 45.0.0.2[r4]interface tunnel 0/0/1
[r4-Tunnel0/0/1]ip address 192.168.6.2 24
[r4-Tunnel0/0/1]tunnel-protocol gre
[r4-Tunnel0/0/1]source 45.0.0.2
[r4-Tunnel0/0/1]destination 15.0.0.1
8，整个私有网络基于RIP全网可达
[r1]rip 1
[r1-rip-1]version 2
[r1-rip-1]network 192.168.1.0
[r1-rip-1]network 192.168.5.0
[r1-rip-1]network 192.168.6.0
[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
[r4]rip 1
[r4-rip-1]version 2
[r4-rip-1]network 192.168.6.0
[r4-rip-1]network 192.168.4.0
[r1-Tunnel0/0/0]nhrp entry multicast dynamic
[r1-Tunnel0/0/0]undo rip split-horizon?
9、所有PC设置私有IP为源IP，可以访问R5环回
????????给PC配置IP 子网掩码 网关
R1-R4都需要配置以下指令
[r1]acl 2000
[r1-acl-basic-2000]rule permit source 192.168.1.0 0.0.0.255
[r1-acl-basic-2000]q
[r1]interface serial 4/0/0
[r1-Serial4/0/0]nat outbound 2000
四、测试结果
