预览加载中，请您耐心等待几秒...

实验5利用Ethereal分析TCP协议.docx

预览
1/7
2/7
3/7
4/7
5/7
6/7
7/7

在线预览结束，喜欢就下载吧，查找使用更方便

下载提示 文本预览

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

计算机网络实验报告 年级：姓名：学号： 实验日期： 实验名称：利用Ethereal分析TCP协议 实验目的 实验器材 接入Internet的计算机主机； 抓包工具wireshark和截图工具snagit。 三、实验内容 1.WhatistheIPaddressandTCPportnumberusedbytheclientcomputer(source)thatistransferringthefiletogaia.cs.umass.edu?Toanswerthisquestion,it’sprobablyeasiesttoselectanHTTPmessageandexplorethedetailsoftheTCPpacketusedtocarrythisHTTPmessage,usingthe“detailsoftheselectedpacketheaderwindow”(refertoFigure2inthe“GettingStartedwithWireshark”Labifyou’reuncertainabouttheWiresharkwindows. theTCPportnumberusedbytheclientcomputer(source)是：1161 如下图： WhatistheIPaddressofgaia.cs.umass.edu?OnwhatportnumberisitsendingandreceivingTCPsegmentsforthisconnection? 答：theIPaddressofgaia.cs.umass.eduis portnumberis 实验结果如下图： WhatistheIPaddressandTCPportnumberusedbyyourclientcomputer(source)totransferthefiletogaia.cs.umass.edu? theTCPportnumberusedbytheclientcomputer(source)是：1432 如下图： WhatisthesequencenumberoftheTCPSYNsegmentthatisusedtoinitiatetheTCPconnectionbetweentheclientcomputerandgaia.cs.umass.edu?WhatisitinthesegmentthatidentifiesthesegmentasaSYNsegment? 实验结果如下图： WhatisthesequencenumberoftheSYNACKsegmentsentbygaia.cs.umass.edutotheclientcomputerinreplytotheSYN?WhatisthevalueoftheACKnowledgementfieldintheSYNACKsegment?Howdidgaia.cs.umass.edudeterminethatvalue?WhatisitinthesegmentthatidentifiesthesegmentasaSYNACKsegment? WhatisthesequencenumberoftheTCPsegmentcontainingtheHTTPPOSTcommand?NotethatinordertofindthePOSTcommand,you’llneedtodigintothepacketcontentfieldatthebottomoftheWiresharkwindow,lookingforasegmentwitha“POST”withinitsDATAfield. 实验结果如下： 7.ConsidertheTCPsegmentcontainingtheHTTPPOSTasthefirstsegmentintheTCPconnection.WhatarethesequencenumbersofthefirstsixsegmentsintheTCPconnection(includingthesegmentcontainingtheHTTPPOST)?Atwhattimewaseachsegmentsent?WhenwastheACKforeachsegmentreceived?GiventhedifferencebetweenwheneachTCPsegmentwassent,andwhenitsacknowledgementwasreceived,whatistheRTTvalueforeachofthesixsegments?WhatistheEstimatedRTTvalue(seepage249intext)a