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首页利用Ethereal分析TCP协议
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实验名称: 实验
5: 利用 Ethereal 分析 TCP 协议
一、实验目的
1.利用 ethereal 俘获的分组来探究 TCP 方方面面的轨迹
2.通过跟踪 TC P窗口行为,推断分组丢失、重传、流量控制和拥塞控制行为,
并估计往返时延。
二、实验器材
1、Ethereal 软件及 SnagIt 软件 2、word 工具 3、画图工具
三、实验内容
1. What is the IP address and TCP port number used by the client computer (source) that is
transferring the file to gaia.cs.umass.edu?
2. What is the IP address of gaia.cs.umass.edu? On what port number is it sending and
receiving TCP segments for this connection? If you have been able to create your own trace,
answer the following question:
1

3. What is the IP address and TCP port number used by your client computer (source) to
transfer the file to gaia.cs.umass.edu?
4. What is the sequence number of the TCP SYN segment that is used to initiate the TCP
2

connection between the client computer and gaia.cs.umass.edu? What is it in the segment that
identifies the segment as a SYN segment?
5. What is the sequence number of the SYNACK segment sent by gaia.cs.umass.edu to the
client computer in reply to the SYN? What is the value of the ACKnowledgement field in the
SYNACK segment? How did gaia.cs.umass.edu determine that value? What is it in the
segment that identifies the segment as a SYNACK segment?
报文段的确认号由客户端的起始序号加 1 所得
6. What is the sequence number of the TCP segment containing the HTTP POST command?
Note that in order to find the POST command, you’ll need to dig into the packet content field at
the bottom of the Ethereal window, looking for a segment with a “POST” within its DATA field.
3
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