实验二十三PPP协议中的CHAP和PAP验证Word格式文档下载.docx

1、（6）链路配置以及链路质量测试（7）回叫（Callback）（8）网络能力的协商选项，如：网络层地址协商和数据压缩协商等 PPP定义了一整套的协议，包括链路控制协议（LCP）、网络层控制协议（NCP）和验证协议（PAP和CHAP）等。其中，链路控制协议LCP（Link Control Protocol）：用来协商链路的一些参数，负责创建并维护链路。网络层控制协议NCP（Network Control Protocol）：用来协商网络层协议的参数。3、PPP建立一个点到点连接的四个阶段（1）链路的建立和配置协商（2）链路质量确定（3）网络层协议配置协商（4）链路拆除4、 PPP的验证方式PAP验

2、证PAP（Password Authentication Protocol，口令鉴定协议）是一种两次握手验证协议，它在网络上采用明文方式传输用户名和口令。PAP验证的过程如下：被验证方主动发起验证请求，将本端的用户名和口令发送到验证方；验证方接到被验证方的验证请求后，检查此用户名是否存在以及口令是否正确。如果此用户名存在且口令正确，验证方返回Acknowledge响应，表示验证通过；如果此用户名不存在或口令错误。验证方返回Not Acknowledge响应，表示验证不通过。CHAP验证CHAP（Challenge Handshake Authentication Protocol，质询握手鉴定

3、协议）是一种三次握手验证协议，它只在网络上传输用户名，而用户口令并不在网络上传播。CHAP验证过程如下： 验证方主动发起验证请求，向被验证方发送一些随机产生的报文，并同时将本端配置的用户名附带上一起发送给被验证方；被验证方接到验证方的验证请求后，根据此报文中的用户名在本端的用户表中查找用户口令。如找到用户表中与验证方用户名相同的用户，便利用报文ID和此用户的口令以MD5算法生成应答，随后将应答和自己的用户名送回；验证方接收到此应答后，利用报文ID、自己保存的被验证方口令以及随机报文用MD5算法得出结果，与被验证方应答比较。如果两者相同，则返回Acknowledge响应，表示验证通过，如果两者不

4、相同，则返回Not Acknowledge相应，表示验证不通过。二、 实验案例1、 实验拓扑结构图：2、配置说明：Router1的S0：192.168.1.10 子网掩码：255.255.255.0Router2的S0：192.168.1.20 子网掩码：3、具体配置：方法一：PAP的单向验证Router1的配置：Router1int s0Router1-Serial0ip address 192.168.10.1 255.255.255.0Router1-Serial0%15:01:45: Line protocol ip on the interface Serial0 is UPRout

5、er1-Serial0link-protocol pppRouter1-Serial0ppp pap local-user sunke password simple sunkeRouter1dis cur Now create configuration. Current configuration version 1.74 sysname Router1 firewall enable aaa-enable aaa accounting-scheme optional interface Aux0 async mode flow link-protocol ppp interface Et

6、hernet0 interface Ethernet1 interface Serial0 clock DTECLK1 ppp pap local-user sunke password simple sunke ip address 192.168.10.1 255.255.255.0 interface Serial1 interface Serial2 interface Serial3 ReturnRouter2的配置：Router2int s0Router2-Serial0ip address 192.168.10.2 255.255.255.0Router2-Serial012:5

7、3:Router2-Serial0link-protocol pppRouter2local-user sunke service-type ppp password simple sunkeRouter2-Serial0ppp authentication-mode papRouter2dsi cur Incorrect commandRouter2dis cur local-user sunke service-type ppp password simple sunke sysname Router2 ppp authentication-mode pap ip address 192.

8、168.10.2 255.255.255.0测试结果：Router1ping 192.168.10.2 PING 192.168.10.2: 56 data bytes, press CTRL_C to break Reply from 192.168.10.2: bytes=56 Sequence=0 ttl=255 time = 27 ms bytes=56 Sequence=1 ttl=255 time = 26 ms bytes=56 Sequence=2 ttl=255 time = 26 ms bytes=56 Sequence=3 ttl=255 time = 26 ms byt

9、es=56 Sequence=4 ttl=255 time = 26 ms - 192.168.10.2 ping statistics - 5 packets transmitted 5 packets received 0.00% packet loss round-trip min/avg/max = 26/26/27 msRouter2ping 192.168.10.1 PING 192.168.10.1: Reply from 192.168.10.1: bytes=56 Sequence=0 ttl=255 time = 26 ms - 192.168.10.1 ping stat

10、istics -round-trip min/avg/max = 26/26/26 msPAP的双向验证Router2添加的配置：Router2-Serial0ppp pap local-user djw password simple djwRouter1添加的配置：Router1local-user djw service-type ppp password simple djwRouter1-Serial0ppp authentication-mode papRouter1-Serial0dis cur local-user djw service-type ppp password s

11、imple djw再次测试结果： round-trip min/avg/max = 26/26/26 ms ING 192.168.10.1: 5 packets received 方法二：CHAP的单向验证 Router1-Serial0ip address 192.168.1.10 255.255.255.0Router1-Serial0ppp chap user sunkeRouter1-Serial0ppp chap password simple sunke ppp chap user sunke ppp chap password simple sunke ip address 1

12、92.168.1.10 255.255.255.0Routersys Router2Router2-Serial0ip address 192.168.1.20 255.255.255.0%16:18:40:Router2-Serial0ppp authentication-mode chapRouter2-Serial0ppp chap user djw ppp authentication-mode chap ppp chap user djw ip address 192.168.1.20 255.255.255.0Router2ping 192.168.1.10 PING 192.16

13、8.1.10: Reply from 192.168.1.10: bytes=56 Sequence=0 ttl=255 time = 25 ms bytes=56 Sequence=1 ttl=255 time = 25 ms bytes=56 Sequence=3 ttl=255 time = 25 ms bytes=56 Sequence=4 ttl=255 time = 25 ms - 192.168.1.10 ping statistics - round-trip min/avg/max = 25/25/26 msRouter1ping 192.168.1.20 PING 192.

14、168.1.20: Reply from 192.168.1.20: bytes=56 Sequence=4 ttl=255 time = 30 ms - 192.168.1.20 ping statistics -round-trip min/avg/max = 25/26/30 msCHAP的双向验证Router1local-user djw service-type ppp password simple quidwayRouter1-Serial0ppp authentication-mode chap local-user djw service-type ppp password simple quidway ip ad