PPP协议配置
来源：原创 作者：hwlinux 2007-10-31 点击：171
这是一个PPP配置-cisco协议的一个实例，在我的博客上首次发表原创教程，进入话题吧，
先看拓扑图：

目标：AB能正常通讯，BC不能正常通讯

主要命令 ：config)#username Router-A password homehui
Router-A是对方的名字(hostname),homehui是密码,互相验证的双方密码要相同.
一、配置路由
Router-A：

Router>
Router>en
Router#conf t
Router(config)#hostname Router-A
Router-A(config)#int s0/0
Router-A(config-if)#ip add 10.10.1.2 255.255.255.0
Router-A(config-if)#encap ppp
Router-A(config-if)#ppp authentication chap
Router-A(config-if)#no shut
Router-A(config-if)#exit
Router-A(config)#username Router-B password homehui
Router-A(config)#end
Router-A#

Router-B：

Press RETURN to get started!
Router>
Router>en
Router#conf t
Router(config)#hostname Router-B
Router-B(config)#int s0/0
Router-B(config-if)#ip add 10.10.1.1 255.255.255.0
Router-B(config-if)#encapsulation ppp
Router-B(config-if)#ppp authentication chap
Router-B(config-if)#no shut
Router-B(config-if)#
Router-B(config)#username Router-A password homehui
Router-B(config)#int s0/1
Router-B(config-if)#ip add 172.16.1.1 255.255.0.0
Router-B(config-if)#encapsulation ppp
Router-B(config-if)#ppp authentication chap
Router-B(config-if)#no shut
Router-B(config-if)#exit
Router-B(config)#username Router-C password netemu
Router-B(config)#end

Router-C：

Router>en
Router#conf t
Router(config)#hostname Router-C
Router-C(config)#int s0/1
Router-C(config-if)#ip add 172.16.1.2 255.255.0.0
Router-C(config-if)#encapsulation ppp
Router-C(config-if)#ppp authentication chap
Router-C(config-if)#no shut
Router-C(config-if)#exit
Router-C(config)#username Router-D password netemu //用户名故意配置Ｒouter-D.
Router-C(config)#end

二、测试路由

Router-A:

Router-A#ping 10.10.1.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.10.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 72/88/120 ms

Router-B:

Router-B#ping 10.10.1.2 （通）

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.10.1.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/77/120 ms

Router-C#ping 172.16.1.2 （不通）

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.1.2 timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)

Router-C：

Router-C#ping 172.16.1.1（不通）

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.1.1timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
Router-C#

三、纠错

Router-C：

Router-C#
Router-C#conf t
Router-C(config)#no username Router-D password netemu //清除前面配置的用户名密码
Router-C(config)#username Router-B password netemu //正确配置为Router-B

Router-C#ping 172.16.1.1 （通了）

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 48/62/72 ms
PPP配置协议就到这里结束了