1.R5为ISP，只能进行IP地址配置；其所有的IP地址均为共有IP地址
2.R1和R5之间使用PPP的PAP认证，R5为主认证方
R2和R5之间使用PPP的chap认证，R5为主认证方
R3和R5之间使用HDLC封装
3.R1/R2/R3构建一个MGRE环境，R1为Hub；
R1/R4之间构建一个GRE环境
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
一 、配置IP地址
R1：
[R1]int g 0/0/0
[R1-GigabitEthernet0/0/0]ip address 192.168.1.254 24
[R1]int s 1/0/0
[R1-Serial1/0/0]ip address 15.0.0.1 24
R2：
[R2]int g 0/0/0
[R2-GigabitEthernet0/0/0]ip address 192.168.2.254 24
[R2]int s 2/0/0
[R2-Serial2/0/0]ip address 25.0.0.2 24
R3：
[R3]int g 0/0/0
[R3-GigabitEthernet0/0/0]ip address 192.168.3.254 24
[R3]int s 3/0/0
[R3-Serial3/0/0]ip address 35.0.0.3 24
R4：
[R4]int g 0/0/1
[R4-GigabitEthernet0/0/1]ip address 192.168.4.254 24
[R4]int g 0/0/0
[R4-GigabitEthernet0/0/0]ip address 45.0.0.4 24
R5：
[R5]int s 1/0/0
[R5-Serial1/0/0]ip address 15.0.0.5 24
[R5]int s 2/0/0
[R5-Serial2/0/0]ip address 25.0.0.5 24
[R5]int s 3/0/0
[R5-Serial3/0/0]ip address 35.0.0.5 24
[R5]int g 0/0/0
[R5-GigabitEthernet0/0/0]ip address 45.0.0.5 24
[R5]int LoopBack 0
[R5-LoopBack0]ip address 5.5.5.5 32二、 配置PAP，CHAP，HDLC封装
（1）R1和R5间使用PPP的PAP认证，R5为主认证方
认证方 R5：
[R5]aaa
[R5-aaa]local-user hcip password cipher 123456
[R5-aaa]local-user hcip service-type ppp
[R5-Serial1/0/0]ppp authentication-mode pap
被认证方 R1：
[R1]int s 1/0/0
[R1-Serial1/0/0]ppp pap local-user hcip password cipher 123456（2）R2与R5之间使用PPP的CHAP认证，R5为主认证方
认证方R5：
[R5-aaa]
[R5-aaa]local-user huawei password cipher 654321
[R5-aaa]local-user huawei service-type ppp
[R5-Serial2/0/0]ppp authentication-mode chap
被认证方R2：
[R2-Serial2/0/0]ppp chap user huawei
[R2-Serial2/0/0]ppp chap password cipher 654321（3）R3与R5之间使用HDLC封装
R3：
[R3]int s 3/0/0
[R3-Serial3/0/0]link-protocol hdlc
R5：
[R5]int s 3/0/0
[R5-Serial3/0/0]link-protocol hdlc 三、 配置MGRE，GRE
[R1]ip route-static 0.0.0.0 0 15.0.0.5
[R2]ip route-static 0.0.0.0 0 25.0.0.5
[R3]ip route-static 0.0.0.0 0 35.0.0.5
[R4]ip route-static 0.0.0.0 0 45.0.0.5（1）R1/R2/R3构建一个MGRE环境，R1为Hub
Hub 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
Spoke R2:
[R2]int Tunnel 0/0/0
[R2-Tunnel0/0/0]ip add 192.168.5.2 24
[R2-Tunnel0/0/0]tunnel-protocol gre p2mp
[R2-Tunnel0/0/0]source Serial 2/0/0
[R2-Tunnel0/0/0]nhrp entry 192.168.5.1 15.0.0.1 register
Spoke R3:
[R3]int 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 3/0/0
[R3-Tunnel0/0/0]nhrp entry 192.168.5.1 15.0.0.1 register （2）R1/R4之间构建一个GRE环境
R1:
[R1]int 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 45.0.0.4
R4:
[R4]int Tunnel 0/0/1
[R4-Tunnel0/0/1]ip address 192.168.6.4 24
[R4-Tunnel0/0/1]tunnel-protocol gre
[R4-Tunnel0/0/1]source 45.0.0.4
[R4-Tunnel0/0/1]destination 15.0.0.1四、 配置RIP协议
R1:
rip 1
version 2
network 192.168.1.0
network 192.168.5.0
network 192.168.6.0
[R1-Tunnel0/0/0]nhrp entry multicast dynamic
[R1-Tunnel0/0/0]undo rip split-horizon
[R1-Tunnel0/0/1]undo rip split-horizon
R2:
rip 1
version 2
network 192.168.2.0
network 192.168.5.0
[R2-Tunnel0/0/1]undo rip split-horizon
R3:
rip 1
version 2
network 192.168.3.0
network 192.168.5.0
[R3-Tunnel0/0/1]undo rip split-horizon
R4:
rip 1
version 2
network 192.168.4.0
network 192.168.6.0
[R4-Tunnel0/0/1]undo rip split-horizon
五、 配置NAT
R1:
[R1]acl number 2000
[R1-acl-basic-2000]rule permit source 192.168.1.0 0.0.0.255
[R1]int Serial 1/0/0
[R1-Serial1/0/0]nat outbound 2000
R2:
[R2]acl 2000
[R2-acl-basic-2000]rule permit source 192.168.2.0 0.0.0.255
[R2]int Serial 2/0/0
[R2-Serial2/0/0]nat outbound 2000
R3:
[R3]acl 2000
[R3-acl-basic-2000]rule permit source 192.168.3.0 0.0.0.255
[R3]int Serial 3/0/0
[R3-Serial3/0/0]nat outbound 2000
R4:
[R4]acl 2000
[R4-acl-basic-2000]rule permit source 192.168.4.0 0.0.0.255
[R4]int g 0/0/0
[R4-GigabitEthernet0/0/0]nat outbound 2000
