250 lines
7.8 KiB
HTML
Executable File
250 lines
7.8 KiB
HTML
Executable File
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title><center>华东师范大学软件学院实验报告</center></title>
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<style>
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/* From extension vscode.github */
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/*---------------------------------------------------------------------------------------------
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License. See License.txt in the project root for license information.
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*--------------------------------------------------------------------------------------------*/
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.vscode-dark img[src$=\#gh-light-mode-only],
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</style>
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</head>
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<body class="vscode-body vscode-light">
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<h1 id="华东师范大学软件学院实验报告"><center>华东师范大学软件学院实验报告</center></h1>
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<table align="center">
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<thead>
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<tr>
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<th style="text-align:left"><strong>实验课程：</strong> 计算机网络</th>
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<th style="text-align:left"><strong>年级:</strong> 2024</th>
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<th style="text-align:left"><strong>实验成绩：</strong></th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td style="text-align:left"><strong>实验名称：</strong> Ethernet</td>
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<td style="text-align:left"><strong>姓名：</strong> 张春晓</td>
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<td style="text-align:left"><strong>实验日期：</strong> 2024.11.29</td>
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</tr>
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<tr>
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<td style="text-align:left"><strong>实验编号：</strong> 2</td>
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<td style="text-align:left"><strong>学号：</strong> 10234507025</td>
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<td style="text-align:left"><strong>实验时间：</strong> 2学时</td>
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</tr>
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</tbody>
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</table>
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<hr>
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<h2 id="一实验目的">一、实验目的</h2>
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<p>学习以太网帧的组成</p>
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<h2 id="二使用内容与实验步骤">二、使用内容与实验步骤</h2>
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<ol>
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<li>捕获帧
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<ol>
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<li>对一个远程服务器使用 ping 指令发送信息，并检查是否有回复；</li>
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<li>启动 Wireshark ，选择过滤 icmp ，开启“启用 MAC 名称解析”选项，开始捕获以太网帧；</li>
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<li>重复第一步；</li>
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<li>终止 ping 指令，返回 Wireshark 并停止捕获。</li>
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</ol>
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</li>
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<li>检查捕获到的数据
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<ol>
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<li>选择捕获到的任意数据包，查看其结构与组成数据包字节的详细信息；</li>
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<li>展开以太网报头字段并查看详细信息。</li>
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</ol>
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</li>
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<li>以太网帧结构
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绘制一个显示以太网头字段位置与大小的 ping 报文图。</li>
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<li>以太网地址范围
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绘制一张图，显示电脑、路由器、远程服务器的相对位置。<br>
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用以太网地址标注计算机与路由器，IP 地址标注计算机与远程服务器。<br>
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并显示以太网和互联网其他部分在图中的位置。</li>
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<li>广播帧
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启动 Wireshark ，选择过滤 ether multicast ，等待一段时间，捕获广播与组播以太网帧，并根据结果完成以下两个任务：<br>
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<ol>
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<li>找到广播以太网地址</li>
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<li>找到以太网地址的哪一位确认是单播还是组播</li>
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</ol>
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</li>
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</ol>
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<h2 id="三实验环境">三、实验环境</h2>
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<ul>
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<li>实验仪器：ThinkPad X230i</li>
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<li>操作系统：Arch GNU/Linux x86_64</li>
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<li>以太网控制器：Intel Corporation 82575LM Gigabit Network Connection</li>
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<li>网络控制器：Realtek Semiconductor Co., Ltd. RTL8188CE 820.11b/g/n WiFi Adapter</li>
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<li>网络连接：校园网ECNU-1X</li>
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</ul>
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<h2 id="四实验过程与分析">四、实验过程与分析</h2>
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<ol>
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<li>捕获帧<br>
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<img src="file:////home/chiyoyuki/homework/conputer_network/lib3-1.png" alt="ping"><br>
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<img src="file:////home/chiyoyuki/homework/conputer_network/lib3-2.png" alt="Wireshark"></li>
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<li>检查捕获到的数据<br><br>
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<img src="file:////home/chiyoyuki/homework/conputer_network/lib3-3.png" alt="ping"></li>
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<li>以太网帧结构<br> <table align="center">
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<tr>
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<td align="center" colspan=3>Ethernet II</td>
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<td align="center">IP&ICMP</td>
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</tr>
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<tr>
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<td align="center">Destination</td>
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<td align="center">Source</td>
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<td align="center">Type</td>
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<td align="center" rowspan=2>60 Bytes</td>
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</tr>
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<tr>
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<td align="center">6 Bytes</td>
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<td align="center">6 Bytes</td>
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<td align="center">2 Bytes</td>
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</tr>
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<tr>
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<td align="center" colspan=3>Ethernet Header</td>
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<td align="center">Ethernet Payload</td>
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<tr>
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</table>
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</li>
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<li>以太网地址范围<br>
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<img src="file:////home/chiyoyuki/homework/conputer_network/lib2-5.png" alt="mermaid"></li>
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<li>广播帧
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捕获内容如图：<br>
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<img src="file:////home/chiyoyuki/homework/conputer_network/lib3-4.png" alt="broadcast"><br>
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<ol>
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<li>以太网地址为 ff:ff:ff:ff:ff:ff，在 Wireshark 中标注为 Broadcast</li>
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<li>第一个字节的末位为1是组播，反之则是单播，所有比特均为1则是广播</li>
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</ol>
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</li>
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</ol>
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<h2 id="五试验结果总结">五、试验结果总结</h2>
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<p>在本次实验中，我顺利地完成了各项任务，了解并学习到了以太网传输的各项细节</p>
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</body>
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</html> |