2023年计算机网络实验报告邮件服务的配置与分析

四川大学计算机学院、软件学院

实验报告

学号:。姓名：也专业：计算机科学与技术班级:班第周

课程

计算机网络课程设计实验课时2

名称

实验

邮件服务的配置与分析实验时间

项目

为了加深对邮件协议的理解，直观清楚的感受邮件协议的工作流程，本实

验借助Wireshark网络分析工具，结合邮件用户代理，运用现有的邮件服

实验务提供商，完毕对邮件收发过程的解析。

目的(1)理解SMTP和POP3协议的基本原理；

(2)理解SMTP和POP3协议的工作流程；

(3)理解SMTP和POP3协议在邮件收发过程的作用。

实验1、Windows10;

环境2、Wireshark-win64-2.2.3;

1、实验原理：

SMTP协议:简朴邮件传输协议(SimpleMai1TransferProt

ocol),发送邮件的标准协议，默认使用端口25在TCP/IP连接上工

实

验作，目的是可靠高效地传送邮件，它独立于传送子系统并且仅规定一条可以保

内

容证传送数据单元顺序的通道。

<协议：邮局协议(

算P0P3Post0fficeProtoco1-Version3),

法接受邮件的标准协议之一,默认使用端口110在TCP/IP连接上工作，目

、

程的是允许工作站用户从邮件服务器中收取邮件。

序2、实验环节：

、

环

节A、创建Foxmail邮箱来作为用户代理

和触鞋号X

方

法

,⑦帮助

接收服务器雌：POP3

邮件帐号：carsonyang518@163.com

空玛：

POP服务器：□SSL:110

SMTP服务器:|口SSL端口：25

口如果股务器支持.就使用STARTTISUQ堂传帏⑴

代建设白

返回创建取消

B、打开wireshark进行发送邮件的抓包

■计网naw实稿wnn而去已保存―c>•

l-w■wjm™zjjji上网二产

收忤人：7718SM97gqxom

►

£■：计同售九网*

MicrosoftY,卜*10.5*£-□干■=1=

计阿第九周实验酒试

（接

carsonyang518@163.com

上）

实验

内容

（算

法、

程

序、

环节

和方

法）

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200616.42143410.132.29.69220.181.12.14SMTP76C:EHLODESKTOP-CSQQGOC

205716.713M2220.181.12.1410.132.29.69SKIP2J9S:250mall|250PIPfLlNING|250AUTHLOGINPLAIN|2S0AU1H»LOGINPLAIN|2S0corewil..

205816.714iS610.132.29,69220.181.12.14SMTP66C:AUTHLOGIN

2M716.755352220.181.12.1410.132.29.69SMTP72S:334<!XNlcw5hbhU6

206916.78107710.132.29.69220.181.12.14SMTP84C:User：Y2Fyc29ueWuZzUxOEAxNjNuY29t

288sl6.813184220.181.12.1410.132.29.69SMTP72$:3MUGFzc3dvc»Q6

208616.81339410.132.29.69229.181.12.14SMTP76C:Pass:Y2Fyc29uMTkM<zAlMTg«

710616.99318s220.181.12.1410.132.29.69SMTP8SS:235AutbentRation»ucc«»»ful

210916.94775219.132.29.69220.181.12.14SMTP96C:NAILFROM:<car$onyang518^163.co«>

213316.985169220.181.12.1410.132.29.69SMTP67S:250MillOK

2B416.98S46110.132.29.69220.181.12.14SNTP83C:RCPTTO:<771858897^Qq.co«>

?14817.017801220.181.12.1410.132.29.69SMTP67S:250MallOK

214917.01818110.132.29.69220.181.12.14SMTP60C:DATA

215217.053191220.181.12.1410.132.29.69SMTP91S:354Enddatawith<CRxLF>><CR><LF>

215317.05341710.132.29.69226.181.12.14SMTP444C:OATAfragoent,390byte*

228917.12835910.132.29.69229.181.12.14IMF976frat:"carsonyangS18^163.coa*<carsonyang518^163.C0M>>subject:•?GB2312?8?vMbfHLXav$XW3Mq.

219517.172974220.181.12.1410.132.29.69SMTP128S:250MallOKqueuedass«itplO,DsCowABX*rZAsPlZBJK9Bw.16642S21509797953

219617.17369610.132.29,69220.181.12.14SMTP60C:QUIT

221417.209210220.181.12.1410.132.29.69SMTP63S:221Bye

Fr«ne2805:119bytesonwire(952bits),119bytescaptured(952bits)oninterfacee

EthernetII.Src:Ruiji«Ne_4c:47:53(58:69:6c:4c:47:53),Ost:Microsof_S«:25:ba(98:Sf:d3:S8:2S:b«)

InternetProtocolVersion4,Src:220.181.12.14,Dst:10.132.29.69

TranuiisslonControlProtocol,SrcPort:25,OstPort:49882,Saq:1,Ack:1,L«n:6s

,SimpleMailTransferProtocol

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C、启动wireshark,点击收取，进行收取邮件的抓包

Foxmail一□

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▼常喇快排序:日距"

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9229.229184121.19S.178.5210.132.29.6988S:«0K3messaee(s)(14S04byte(s)]

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9249.270547121.195.178.52IS.132.29.6967S:♦(*314564

9259.27197610.132.29.6912260C：LIST

9269.31155412210.132.29.6994S:«(X314W4

9279.31211610.132.29.69121.19S.178.5260C:UIDL

9369.351390121.195.178.S216.132.29.69148S:40K314504

9379.3615671B.132.M.69262C:RETR3

9389.40317212210.132.29.6971S:«0K4172octets

9399.40810712218.132.29.691448S:DATAfragaent,1394bytes

9419.40M27121.19S.178.5210.132.29.691448S:DATAfragment,1394bytes

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SMTP协议分析：

(1)邮件发送方与邮件服务器端建立连接,服务器返回连接成功信息是状态是什

么，具体信息有哪些？

▼SimpleMailTransferProtocol

vResponse:220163.comAnti-spamGTforCoremailSystem(163com[20141201])\r\n

Responsecode:<domain>Serviceready(220)

Responseparameter:163.comAnti-spamGTforCoremailSystem(163com[20141201])

答：220,具体信息有220163.comAnti-spamGTforCoremai1System

(163com[20231201])。

(2)邮件服务器收到发送方的消息后EHLO后，服务器返回什么信息？

vSimpleMailTransferProtocol

▼Response:250-mail\r\n

Responsecode:Requestedmailactionokay,completed(250)

Responseparameter:mail

▼Response:250-PIPELINING\r\n

Responsecode:Requestedmailactionokay,completed(250)

Responseparameter:PIPELINING

▼Response:250-AUTHLOGINPLAIN\r\n

数据Responsecode:Requestedmailactionokay,completed(250)

Responseparameter:AUTHLOGINPLAIN

记录vResponse:250-AUTH=LOGINPLAIN\r\n

Responsecode:Requestedmailactionokay,completed(250)

和计Responseparameter:AUTH=LOGINPLAIN

〜Response:250-coremaillUxr2xKj7kG0xkI17xGrU7I0s8FY2U3Uj8Cz28xlUUUUU7Ic2I0Y2UrN7QTFUCa0xDrUUUUj\r\n

算Responsecode:Requestedmailactionokay,completed(250)

Responseparameter:coremaillUxr2xKj7kG0xkI17xGrU7I0s8FY2U3Uj8Cz28xlUUUUU7Ic2I0Y2UrN7QTFUCa0xDrllUUUj

vResponse:250-STARTTLS\r\n

Responsecode:Requestedmailactionokay,completed(250)

Responseparameter:STARTTLS

vResponse:2508BITMIME\r\n

Responsecode:Requestedmailactionokay,completed(250)

Responseparameter:8BITMIME

答：返回了250mai1|250PIPELINING250AUTHLOGINPLAIN250

AUTH=L0GINPLAIN|250coremai1Wxr2xKj7kG0xkIl7xGrU7I0s8F

Y2U3UJ8Cz28x1UUUUU7Ic2I0Y2UrN7QTFUCaOxDrUUUUjI250STARTTLS|25

08BITMIME

(3)邮件服务器收到发送方的身份验证请求后，服务器将返回什么信息？

205816.71438694SMTP66C：AUTHLOGIN

206716.75535249SMTP72S:334dXNlcm5hbWU6

206916.78107794SMTP84C:User:Y2Fyc29ueWFuZzUxOEAxNjMuY29t

208516.81318449SMTP72S:334UGFzc3dvcmQ6

208616.81339494SMTP76C:Pass:Y2Fyc29uMTk5NzAlMTg=

210616.90338549SMTP85S:235Authenticationsuccessful

答：返回了334dXN1cm5hbWU60

(4)请描述SMTP协议将邮件投递到相应用户邮箱中的工作流程。

答:一方面建立本机与邮件服务器之间的TCP连接，之后向服务器标记用户身份,

然后输入密码登陆服务器,之后指定发信者,再指定收信者，最后发送数据即完毕

了所有工作流程。

POP协议分析：

(1)邮件接受方与邮件服务器端建立连接，服务器返回连接成功信息是什么，

具体信息有哪些？

vPostOfficeProtocol

>+0KWelcometocoremailMailPop3Server(163coms[726cd87d72d896alac393507346040fas])\r\n

答：返回了+0KWeicometocoremai1Mai1Pop3Server(163coms[726cd87d72d896a

1acfas])o

(2)运用USER<name>和PASS<password>向邮件服务器发送认证信息，

服务器返回什么信息？

8999.08936092POP82C:USERcarsonyang51%163.com

9039.12758029POP69S:+0Kcoremail

9069.12809092POP75C:PASScarsonl9970518

9229.22918429POP88S:+0K3message(s)[14504byte(s)]

答：返回了+0Kcoremai1和+0K3message(s)[14504by

te(s)]o

(3)接受方发送LIST命令，用于查询邮件服务器状态以及每封邮件的状态，将

返回什么信息？

9259.27197692POP60C:LIST

9269.31155429POP94S:+0K314504

▼PostOfficeProtocol

▼+0K314504\r\n

Responseindicator:+0K

Responsedescription:314504

19125\r\n

21207\r\n

34172\r\n

答:返回了ANno

(4)在进行POP3协议的分析时，当账户没有新邮件到来时，点击“收取”，

会出现什么情况？

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469.503864192.168.191.6226.181.12.110POP82C:USERcaronyan”】酩631.co«

489.550678220.181.12.110192.168.191.6POP69$：*0Kcorerail

499.5S0970192.16B.191.6229.181.12.110POP7SC:PASSc«rsonl997e518

519.647999220.181.12.110192.168.191.6POP885:♦(*3message(s)(14504byte(s)]