ccna协议分析实验--徐曙光.ppt

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1、抓包实验报告TCP链接建立的三次握手/链接拆除的四次握手Telnet:不安全的原因Ping第一个慢的原因QQ端口号抓包TCP/IP头部Traceroute所用的协议(思科的命令)Tracert所用的协议(微软的命令)作者：徐曙光三次握手、四次解除三次握手弄好了三次握手把抓到的包关了，又重弄一次，所以前后不一样。。四次解除第一次握手作者：徐曙光ClientServerClient向Server发起连接请求，以一个随机初始化seq，这里seq等于0.Sourceport:49961(49961)Destinationport:http(80)[Streamin

2、dex:13]Sequencenumber:0(relativesequencenumber)Headerlength:28bytesFlags:0x02(SYN)000.........=Reserved:Notset...0........=Nonce:Notset....0.......=CongestionWindowReduced(CWR):Notset.....0......=ECN-Echo:Notset......0.....=Urgent:Notset.......0....=Acknowledgement:Notset........0

3、...=Push:Notset.........0..=Reset:Notset..........1.=Syn:Set看详细数据第二次握手SYN(seq=0)No.TimeSourceDestinationProtocolInfo859643.792916192.168.1.100220.170.192.102TCP49961>http[SYN]Seq=0Win=8192Len=0MSS=1460SACK_PERM=1InternetProtocol,Src:192.168.1.100(192.168.1.100),Dst:220.170.192.102

4、(220.170.192.102)Version:4Headerlength:20bytesDifferentiatedServicesField:0x00(DSCP0x00:Default;ECN:0x00)000000..=DifferentiatedServicesCodepoint:Default(0x00)......0.=ECN-CapableTransport(ECT):0.......0=ECN-CE:0TotalLength:48Identification:0x7acf(31439)Flags:0x02(Don'tFragment)0.

5、......=Reservedbit:Notset.1......=Don'tfragment:Set..0.....=Morefragments:NotsetFragmentoffset:0Timetolive:128Protocol:TCP(6)Headerchecksum:0x0000[incorrect,shouldbe0x20db][Good:False][Bad:True][ExpertInfo(Error/Checksum):Badchecksum][Message:Badchecksum][Severitylevel:Error][Grou

6、p:Checksum]Source:192.168.1.100(192.168.1.100)Destination:220.170.192.102(220.170.192.102)TransmissionControlProtocol,SrcPort:49961(49961),DstPort:http(80),Seq:0,Len:0Sourceport:49961(49961)Destinationport:http(80)[Streamindex:13]第一次握手作者：徐曙光Sequencenumber:0(relativesequencenumber)

7、Headerlength:28bytesFlags:0x02(SYN)000.........=Reserved:Notset...0........=Nonce:Notset....0.......=CongestionWindowReduced(CWR):Notset.....0......=ECN-Echo:Notset......0.....=Urgent:Notset.......0....=Acknowledgement:Notset........0...=Push:Notset.........0..=Reset:Notset.......

8、...1.=Syn:Set[ExpertInfo(Chat/Seq