实验四利用wireshark分析DNS实验报告.docx

陕西师范大学计算机网络实验报告年级：2008级计算机科学与技术姓名：学号：实验日期：2010.10.20实验名称：利用wireshark分析DNS实验目的学会使用nslookup工具查询并分析Internet域名信息或诊断DNS服务器。学会使用ipconfig工具进行分析。会用wireshark分析DNS协议。对DNS协议有个全面的学习与了解。实验器材接入Internet的计算机主机；2、抓包工具wireshark和截图工具snagit。三、实验内容1.RunnslookuptoobtaintheIPaddressofaWebserverinAsia.theIPaddressofHYPERLINK"http://www.tsinghua.edu.cn"www.tsinghua.edu.cn：166.111.4.1002.RunnslookuptodeterminetheauthoritativeDNSserversforauniversityinEurope.实验结果如下图：3.RunnslookupsothatoneoftheDNSserversobtainedinQuestion2isqueriedforthemailserversforYahoo!mail.实验结果如下图：4.LocatetheDNSqueryandresponsemessages.ArethensentoverUDPorTCP?答：DNSqueryandresponsemessages如下图标注，TheyatesentoverUDP；5.WhatisthedestinationportfortheDNSquerymessage?WhatisthesourceportofDNSresponsemessage?答：thedestinationportis：64211（64211）thesourceportis：domain（53）6.TowhatIPaddressistheDNSquerymessagesent?UseipconfigtodeterminetheIPaddressofyourlocalDNSserver.ArethesetwoIPaddressesthesame?答：ip地址10.0.163.199，这两个IP地址是一样的。试验截图如下7.ExaminetheDNSquerymessage.What“Type”ofDNSqueryisit?Doesthequerymessagecontainany“answers”?答：“Type”ofDNSqueryis（hostaddress）没有包含“answer”；8.ExaminetheDNSresponsemessage.Howmany“answers”areprovided?Whatdoeachoftheseanswerscontain?答：“answers”如下图：9.ConsiderthesubsequentTCPSYNpacketsentbyyourhost.DoesthedestinationIPaddressoftheSYNpacketcorrespondtoanyoftheIPaddressesprovidedintheDNSresponsemessage?答：10.Thiswebpagecontainsimages.Beforeretrievingeachimage,doesyourhostissuenewDNSqueries?答：myhostissuedon’tissuenewDNSqueries。11.WhatisthedestinationportfortheDNSquerymessage?WhatisthesourceportofDNSresponsemessage?答：thedestinationportfortheDNSquerymessage：