NA-NP-IE系列实验30:CHAP 认证-白红宇

实验30:CHAP 认证

实验目的

通过本实验，读者可以掌握如下技能：

(1) CHAP

认证的配置方法（使用“username 用户名 password 密码” 命令为对方配置用户名和密码，需要注意的是两方的密码要相同）

实验拓扑

如图。

实验步骤

注：

CHAP

验证的最简单配置，也是实际应用中最常用的配置方式。配置时要求用户

名为对方路由器名，而双方密码必须一致。原因是：由于CHAP 默认使用本地路由器的名字

做为建立PPP 连接时的识别符。路由器在收到对方发送过来的询问消息后，将本地路由器的

名字作为身份标识发送给对方；而在收到对方发过来的身份标识之后，默认使用本地验证方

法，即在配置文件中寻找，看看有没有用户身份标识和密码；如果有，计算加密值，结果正

确则验证通过；否则验证失败，连接无法建立。

r0(config-if)#ip add 172.16.1.1 255.255.255.0

r0(config-if)#no sh

r0(config-if)#

*Mar 1 00:05:08.115: %LINK-3-UPDOWN: Interface Serial0/0, changed state to up

r0(config-if)#

*Mar 1 00:05:09.123: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to up

r0(config-if)#

*Mar 1 00:05:37.155: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to down

r0(config-if)#

*Mar 1 00:06:07.155: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to up

r0(config-if)#exit

r0(config)#int s0/0

r0(config-if)#username r1 pass cisco

r0(config)#int s0/0

r0(config-if)#enc ppp

r0(config-if)#ppp authen chap

路由器的两端串口采用PPP 封装，并采用配置CHAP 验证：

r0(config-if)#do sh ip int b

Interface IP-Address OK? Method Status Protocol

FastEthernet0/0 unassigned YES unset administratively down down

Serial0/0 172.16.1.1 YES manual up up

FastEthernet0/1 unassigned YES unset administratively down down

Serial0/1 unassigned YES unset administratively down down

r0(config-if)#do debug ppp authen

PPP authentication debugging is on

r0(config-if)#do ping 172.16.1.2

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.16.1.2, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 4/18/36 ms

r0(config-if)#sh

r0(config-if)#no sh

*Mar 1 00:08:51.079: %LINK-5-CHANGED: Interface Serial0/0, changed state to administratively down

*Mar 1 00:08:52.079: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to down

r0(config-if)#no sh

r0(config-if)#

*Mar 1 00:08:54.551: Se0/0 PPP: Using default call direction

*Mar 1 00:08:54.559: Se0/0 PPP: Treating connection as a dedicated line

*Mar 1 00:08:54.559: Se0/0 PPP: Session handle[5A000004] Session id[2]

*Mar 1 00:08:54.563: Se0/0 PPP: Authorization required

*Mar 1 00:08:54.567: %LINK-3-UPDOWN: Interface Serial0/0, changed state to up

*Mar 1 00:08:54.663: Se0/0 CHAP: O CHALLENGE id 2 len 23 from "r0"

*Mar 1 00:08:54.731: Se0/0 CHAP: I CHALLENGE id 3 len 23 from "r1"

*Mar 1 00:08:54.747: Se0/0 CHAP: Using hostname from unknown source

*Mar 1 00:08:54.747: Se0/0 CHAP: Using password from AAA

*Mar 1 00:08:54.747: Se0/0 CHAP: O RESPONSE id 3 len 23 from "r0"

*Mar 1 00:08:54.779: Se0/0 CHAP: I RESPONSE id 2 len 23 from "r1"

*Mar 1 00:08:54.779: Se0/0 PPP: Sent CHAP LOGIN Request

*Mar 1 00:08:54.791: Se0/0 PPP: Received LOGIN Response PASS

*Mar 1 00:08:54.795: Se0/0 PPP: Sent LCP AUTHOR Request

*Mar 1 00:08:54.803: Se0/0 PPP: Sent IPCP AUTHOR Request

r0(config-if)#

*Mar 1 00:08:54.803: Se0/0 CHAP: I SUCCESS id 3 len 4

*Mar 1 00:08:54.823: Se0/0 LCP: Received AAA AUTHOR Response PASS

*Mar 1 00:08:54.827: Se0/0 IPCP: Received AAA AUTHOR Response PASS

*Mar 1 00:08:54.827: Se0/0 CHAP: O SUCCESS id 2 len 4

*Mar 1 00:08:54.839: Se0/0 PPP: Sent CDPCP AUTHOR Request

*Mar 1 00:08:54.847: Se0/0 PPP: Sent IPCP AUTHOR Request

*Mar 1 00:08:54.875: Se0/0 CDPCP: Received AAA AUTHOR Response PASS

r0(config-if)#

*Mar 1 00:08:55.827: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to up

以上是chap

的验证过程。

r0(config-if)#do un all

All possible debugging has been turned off

r0(config-if)#

r1(config)#no ip do loo

r1(config)#lin c 0

r1(config-line)#logg s

r1(config-line)#exec-t 00

r1(config-line)#exit

r1(config)#int s0/0

r1(config-if)#ip add 172.16.1.2 255.255.255.0

r1(config-if)#no sh

r1(config-if)#exit

*Mar 1 00:05:48.767: %LINK-3-UPDOWN: Interface Serial0/0, changed state to up

*Mar 1 00:05:49.775: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to up

r1(config-if)#exit

r1(config)#username r0 pass cisco

r1(config)#int s0/0

r1(config-if)#username r0 pass cisco

r1(config)#int s0/0

r1(config-if)#enc ppp

*Mar 1 00:07:32.291: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to down

r1(config-if)#ppp authen

r1(config-if)#ppp authentication chap

r1(config-if)#

*Mar 1 00:07:52.351: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to up

r1(config-if)#do sh ip int b

Interface IP-Address OK? Method Status Protocol

FastEthernet0/0 unassigned YES unset administratively down down

Serial0/0 172.16.1.2 YES manual up up

FastEthernet0/1 unassigned YES unset administratively down down

Serial0/1 unassigned YES unset administratively down down

r1(config-if)#do ping 172.16.1.1

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 = 1/18/48 ms

r1(config-if)#

本文转自gauyanm 51CTO博客，原文链接：http://blog.51cto.com/gauyanm/238163，如需转载请自行联系原作者