本文主要是介绍HCIP---MGRE和GRE实验，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
一、配置ip
R1:
[R1]int g0/0/0
[R1-GigabitEthernet0/0/0]ip add 192.168.1.254 24
[R1-GigabitEthernet0/0/0]int s4/0/0
[R1-Serial4/0/0]ip add 15.1.1.1 24
[R1]ip route-static 0.0.0.0 0 15.1.1.5
R2:
[R2]int g0/0/0
[R2-GigabitEthernet0/0/0]ip add 192.168.2.254 24
[R2-GigabitEthernet0/0/0]int s4/0/0
[R2-Serial4/0/0]ip add 25.1.1.2 24
[R1]ip route-static 0.0.0.0 0 25.1.1.5
R3:
[R3]int s4/0/0
[R3-Serial4/0/0]ip add 35.1.1.3 24
[R3-Serial4/0/0]int g0/0/0
[R3-GigabitEthernet0/0/0]ip add 192.168.3.254 24
[R1]ip route-static 0.0.0.0 0 35.1.1.5
R4:
[R4]int g0/0/0
[R4-GigabitEthernet0/0/0]ip add 45.1.1.4 24
[R4-GigabitEthernet0/0/0]int g0/0/1
[R4-GigabitEthernet0/0/1]ip add 192.168.4.1 24
[R1]ip route-static 0.0.0.0 0 45.1.1.5
ISP（R5）:
[ISP]int s4/0/1
[ISP-Serial4/0/1]ip add 15.1.1.5 24
[ISP-Serial4/0/1]int s3/0/1
[ISP-Serial3/0/1]ip add 25.1.1.5 24
[ISP-Serial3/0/1]int s4/0/0
[ISP-Serial4/0/0]ip add 35.1.1.5 24
[ISP-Serial4/0/0]int g0/0/0
[ISP-GigabitEthernet0/0/0]ip add 45.1.1.5 24
[ISP-LoopBack0]ip add 5.5.5.5 24
二、R1和R5间使用PPP的PAP认证，R5为主认证方;
R1：
[R1]int s4/0/0
[R1-Serial4/0/0]ppp pap local-user wangdaye password cipher wdy12345
R5：
[ISP]aaa
[ISP-aaa]local-user wangdaye password cipher wdy12345
Info: Add a new user.
[ISP-aaa]local-user wangdaye service-type ppp
[ISP-aaa]q
[ISP]int s 4/0/1
[ISP-Serial4/0/1]ppp authentication-mode pap
[ISP-Serial4/0/1]q
R2与R5之间使用ppp的CHAP认证，R5为主认证方;
R2：
[R2]int s 4/0/0
[R2-Serial4/0/0]ppp chap user zhangdaye
[R2-Serial4/0/0]ppp chap password cipher zdy12345
R5：
[ISP]aaa
[ISP-aaa]local-user zhangdaye password cipher zdy12345
Info: Add a new user.
[ISP-aaa]local-user zhangdaye service-type ppp
[ISP-aaa]int s3/0/1
[ISP-Serial3/0/1]ppp authentication-mode chap
[ISP-Serial3/0/1]q
R3与R5之间使用HDLC封装;
R3:
[R3]int s4/0/0
[R3-Serial4/0/0]link-protocol hdlc
R5:
[ISP]int s4/0/0
[ISP-Serial4/0/0]link-protocol hdlc
三、①R1、R2、R3构建一个MGRE环境，R1为中心站点
R1:
[R1]int Tunnel 0/0/0
[R1-Tunnel0/0/0]ip add 10.1.2.1 24
[R1-Tunnel0/0/0]tunnel-protocol gre p2mp
[R1-Tunnel0/0/0]source 15.1.1.1
[R1-Tunnel0/0/0]nhrp network-id 100
R2:
[R2]int t 0/0/0
[R2-Tunnel0/0/0]ip add 10.1.2.2 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 10.1.2.1 15.1.1.1 register
R3:
[R3]int t 0/0/0
[R3-Tunnel0/0/0]ip add 10.1.2.3 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 10.1.2.1 15.1.1.1 register
②R1、R4间为点到点的GRE;
R1:
[R1]int t 0/0/1
[R1-Tunnel0/0/1]ip add 10.1.1.1 24
[R1-Tunnel0/0/1]tunnel-protocol gre
[R1-Tunnel0/0/1]source 15.1.1.1
[R1-Tunnel0/0/1]destination 45.1.1.4
R4:
[R4]int t0/0/1
[R4-Tunnel0/0/1]ip add 10.1.1.4 24
[R4-Tunnel0/0/1]tunnel-protocol gre
[R4-Tunnel0/0/1]source 45.1.1.4
[R4-Tunnel0/0/1]destination 15.1.1.1
四、整个私有网络基于RIP全网可达;
R1:
[R1]rip 1
[R1-rip-1]v 2
[R1-rip-1]undo summary
[R1-rip-1]netw 10.0.0.0
[R1-rip-1]netw 192.168.1.0
[R1]int t0/0/0
[R1-Tunnel0/0/0]nhrp entry multicast dynamic
R2:
[R2]rip 1
[R2-rip-1]v 2
[R2-rip-1]undo summary
[R2-rip-1]net 10.0.0.0
[R2-rip-1]net 192.168.2.0
[R2]int t0/0/0
[R2-Tunnel0/0/0]undo rip split-horizon
R3:
[R3]rip 1
[R3-rip-1]v 2
[R3-rip-1]undo summary
[R3-rip-1]netw 10.0.0.0
[R3-rip-1]netw 192.168.3.0
[R3]int t0/0/0
[R3-Tunnel0/0/0]undo rip split-horizon
R4:
[R4]rip 1
[R4-rip-1]v 2
[R4-rip-1]undo summary
[R4-rip-1]netw 10.0.0.0
[R4-rip-1]netw 192.168.4.0
五、、所有pc设置私有IP为源IP，可以访问R5环回,达到全网通。
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 s4/0/0
[R1-Serial4/0/0]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 s4/0/0
[R2-Serial4/0/0]nat outbound 2000
R3:
[R3]acl 2000
[R3-acl-basic-2000]rule permit source 192.168.3.0 0.0.0.255
[R3-acl-basic-2000]int s4/0/0
[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]int g0/0/0
[R4-GigabitEthernet0/0/0]nat outbound 2000
pc1ping通R5的环回接口
pc3ping通R5的环回接口
pc2ping通R5的环回接口
pc4ping通R5的环回接口
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