实验拓扑图：

[r1]interface g0/0/0
[r1-GigabitEthernet0/0/0]ip add 12.1.1.1 24
[r1]interface LoopBack 0
[r1-LoopBack0]ip add 1.1.1.1 32

 二、全网可达，rip(v1和v2)图中r2-7使用v2，r8、r9使用v1

[r2]rip 1
[r2-rip-1]version 1
[r2-rip-1]network  2.0.0.0
[r2-rip-1]network  192.168.1.0

[r2]rip 1
[r2-rip-1]version 2
[r2-rip-1]undo summary
[r2-rip-1]network

在r6上做V1和V2的兼容，此时r2-9可达

[R6]interface g0/0/0

[R6-GigabitEthernet0/0/0]rip version 1

 连通外网 （缺省，NAT）此时全网可达，可连通外网

[r2]ip route-static 0.0.0.0 0 12.1.1.1
[r2]rip 1 
[r2-rip-1]default-route originate         //下放缺省路由

[r2]acl 2000   
[r2-acl-basic-2000]rule permit source any
[r2]int g0/0/1  
[r2-GigabitEthernet0/0/1]nat outbound 2000           //多对一NAT

 人为干涉选路，先抓取流量再增加cost值

[r3]acl 2000
[r3-acl-basic-2000]rule permit source 7.7.7.7 0.0.0.0
[r3-acl-basic-2000]rule permit source 7.7.7.77 0.0.0.0
[r3-acl-basic-2000]qu
[r3]interface g0/0/1
[r3-GigabitEthernet0/0/1]rip metricin 2000 6

开启远程登陆并转换远程登录

[r2]user-interface vty 0 4
[r2-ui-vty0-4]authentication-mode password 
Please configure the login password (maximum length 16):123

[r9]user-interface vty 0 4
[r9-ui-vty0-4]authentication-mode password 
Please configure the login password (maximum length 16):123 

[r2]interface g0/0/0
[r2-GigabitEthernet0/0/0]nat server protocol tcp global 12.1.1.3 23 inside 172.1
6.128.2 23