PPP(Point to Point Protocol)数据链路层协议。两种认证方式：一种是PAP，一种是CHAP。相对来说PAP的认证方式安全性没有CHAP高。PAP在传输password是明文的，而CHAP在传输过程中不传输密码，PAP认证是通过两次握手实现的，而CHAP则是通过3次握手实现的。 一、实验配置拓扑图 图一 二、PPP的基本配置命令 Router(config-if)#encapsulation PPP Router(config-if)#PPP multilink Router(config-if)#PPP authentication chap 三、配置PPP 图二路由器Boson上配置PPP的命令 图三 Newyork上配置PPP的命令 图四启用RIP路由协议，两个路由器要配置RIP Boson路由器的配置： Boston#sh running-config Building configuration... Current configuration : 652 bytes ! version 12.4 no service password-encryption ! hostname Boston ! ! ! ! ! username Newyork password 0 senya ! ip ssh version 1 no ip domain-lookup ! ! interface FastEthernet0/0 no ip address duplex auto speed auto shutdown ! interface FastEthernet0/1 ip address 192.168.1.1 255.255.255.0 duplex auto speed auto ! interface Serial0/3/0 description Link to Router Newyork ip address 192.168.2.1 255.255.255.0 encapsulation ppp ppp authentication chap clock rate 56000 ! interface Vlan1 no ip address shutdown ! router rip version 2 network 192.168.1.0 network 192.168.2.0 ! ip classless ! ! ! ! ! line con 0 line vty 0 4 login ! ! end Newyork路由器的配置： Newyork#sh running-config Building configuration... Current configuration : 606 bytes ! version 12.4 no service password-encryption ! hostname Newyork ! ! ! ! ! username Boston password 0 senya ! ip ssh version 1 ! ! interface FastEthernet0/0 no ip address duplex auto speed auto shutdown ! interface FastEthernet0/1 ip address 192.168.3.1 255.255.255.0 duplex auto speed auto ! interface Serial0/3/0 description link to Boston ip address 192.168.2.2 255.255.255.0 encapsulation ppp ppp authentication chap ! interface Vlan1 no ip address shutdown ! router rip version 2 network 192.168.2.0 network 192.168.3.0 ! ip classless ! ! ! ! ! line con 0 line vty 0 4 login ! ! end 图五配置计算机的IP地址及网关
