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<h1 class="idp-ltr-html-topictitle1">DHCP</h1>
<div class="idp-ltr-html-topicbody"><p>DHCP报文是承载于UDP上的高层协议报文,采用67(DHCP服务器)和68(DHCP客户端)两个端口号。DHCP的报文格式如下图所示。</p>
<div class="idp-ltr-html-section"><h2 class="idp-ltr-html-sectiontitle">报文格式</h2><div class="idp-ltr-html-fignone" id="ZH-CN_CONCEPT_0254009278__figd0e47803"><span class="idp-ltr-html-figcap"><span class="idp-ltr-html-figurenumber">图6-39</span> DHCP报文格式</span><pre class="idp-ltr-html-screen-breakword">0 7 15 31
+------------------------------------------+
| Op(1) | Htype(1) | Hlen(1) | Hops(1) |
+------------------------------------------|
| Xid(4) |
+------------------------------------------|
| Secs(2) | Flags(2) |
+------------------------------------------|
| Ciaddr(4) |
+------------------------------------------|
| Yiaddr(4) |
+------------------------------------------|
| Siaddr(4) |
+------------------------------------------|
| Giaddr(4) |
+------------------------------------------+
| Chaddr(16) |
+------------------------------------------+
| Sname(64) |
+------------------------------------------|
| File(128) |
+------------------------------------------+
| Options(variable) |
+------------------------------------------+</pre>
</div>
<p>DHCP报文中各字段的含义:</p>
<div class="idp-ltr-html-tablenoborder"><table cellpadding="4" cellspacing="0" summary="" class="idp-ltr-html-tb-normal" id="ZH-CN_CONCEPT_0254009278__tabled0e47810" frame="border" border="1" rules="all"><thead align="left"><tr><th class="idp-ltr-html-cellrowborder" valign="top" width="6%" id="mcps1.9.9.4.1.4.1.4.1.1"><p>字段</p>
</th>
<th class="idp-ltr-html-cellrowborder" valign="top" width="9%" id="mcps1.9.9.4.1.4.1.4.1.2"><p>长度</p>
</th>
<th class="idp-ltr-html-cellrowborder" valign="top" width="85%" id="mcps1.9.9.4.1.4.1.4.1.3"><p>含义</p>
</th>
</tr>
</thead>
<tbody><tr><td class="idp-ltr-html-cellrowborder" valign="top" width="6%" headers="mcps1.9.9.4.1.4.1.4.1.1 "><p>Op</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="9%" headers="mcps1.9.9.4.1.4.1.4.1.2 "><p>1字节</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="85%" headers="mcps1.9.9.4.1.4.1.4.1.3 "><p>表示报文的类型:</p>
<ul class="idp-ltr-html-ul"><li class="idp-ltr-html-li">1:客户端请求报文</li><li class="idp-ltr-html-li">2:服务器响应报文</li></ul>
</td>
</tr>
<tr><td class="idp-ltr-html-cellrowborder" valign="top" width="6%" headers="mcps1.9.9.4.1.4.1.4.1.1 "><p>Htype</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="9%" headers="mcps1.9.9.4.1.4.1.4.1.2 "><p>1字节</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="85%" headers="mcps1.9.9.4.1.4.1.4.1.3 "><p>表示硬件地址的类型。对于以太网,该类型的值为“1”。</p>
</td>
</tr>
<tr><td class="idp-ltr-html-cellrowborder" valign="top" width="6%" headers="mcps1.9.9.4.1.4.1.4.1.1 "><p>Hlen</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="9%" headers="mcps1.9.9.4.1.4.1.4.1.2 "><p>1字节</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="85%" headers="mcps1.9.9.4.1.4.1.4.1.3 "><p>表示硬件地址的长度,单位是字节。对于以太网,该值为6。</p>
</td>
</tr>
<tr><td class="idp-ltr-html-cellrowborder" valign="top" width="6%" headers="mcps1.9.9.4.1.4.1.4.1.1 "><p>Hops</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="9%" headers="mcps1.9.9.4.1.4.1.4.1.2 "><p>1字节</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="85%" headers="mcps1.9.9.4.1.4.1.4.1.3 "><p>跳数。客户端设置为0,也能被一个代理服务器设置。</p>
</td>
</tr>
<tr><td class="idp-ltr-html-cellrowborder" valign="top" width="6%" headers="mcps1.9.9.4.1.4.1.4.1.1 "><p>Xid</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="9%" headers="mcps1.9.9.4.1.4.1.4.1.2 "><p>4字节</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="85%" headers="mcps1.9.9.4.1.4.1.4.1.3 "><p>事务ID,由客户端选择的一个随机数,被服务器和客户端用来在它们之间交流请求和响应,客户端用它对请求和应答进行匹配。该ID由客户端设置并由服务器返回,为32位整数。</p>
</td>
</tr>
<tr><td class="idp-ltr-html-cellrowborder" valign="top" width="6%" headers="mcps1.9.9.4.1.4.1.4.1.1 "><p>Secs</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="9%" headers="mcps1.9.9.4.1.4.1.4.1.2 "><p>2字节</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="85%" headers="mcps1.9.9.4.1.4.1.4.1.3 "><p>由客户端填充,表示从客户端开始获得IP地址或IP地址续借后所使用了的秒数。</p>
</td>
</tr>
<tr><td class="idp-ltr-html-cellrowborder" valign="top" width="6%" headers="mcps1.9.9.4.1.4.1.4.1.1 "><p>Flags</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="9%" headers="mcps1.9.9.4.1.4.1.4.1.2 "><p>2字节</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="85%" headers="mcps1.9.9.4.1.4.1.4.1.3 "><p>此字段在BOOTP中保留未用,在DHCP中表示标志字段。</p>
<div class="idp-ltr-html-fignone" id="ZH-CN_CONCEPT_0254009278__figd0e47902"><span class="idp-ltr-html-figcap"><span class="idp-ltr-html-figurenumber">图6-40</span> Flags字段格式</span><pre class="idp-ltr-html-screen-breakword">0 15
+---------------------------------+
| B | flags(2) |
+---------------------------------+</pre>
</div>
<p>只有标志字段的最高位才有意义,其余的位均被置为0。</p>
<p>最左边的字段被解释为广播响应标志位,内容如下所示:</p>
<ul class="idp-ltr-html-ul"><li class="idp-ltr-html-li">0:客户端请求服务器以单播形式发送响应报文</li><li class="idp-ltr-html-li">1:客户端请求服务器以广播形式发送响应报文</li></ul>
</td>
</tr>
<tr><td class="idp-ltr-html-cellrowborder" valign="top" width="6%" headers="mcps1.9.9.4.1.4.1.4.1.1 "><p>Ciaddr</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="9%" headers="mcps1.9.9.4.1.4.1.4.1.2 "><p>4字节</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="85%" headers="mcps1.9.9.4.1.4.1.4.1.3 "><p>客户端的IP地址。只有客户端是Bound、Renew、Rebinding状态,并且能响应ARP请求时,才能被填充。</p>
</td>
</tr>
<tr><td class="idp-ltr-html-cellrowborder" valign="top" width="6%" headers="mcps1.9.9.4.1.4.1.4.1.1 "><p>Yiaddr</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="9%" headers="mcps1.9.9.4.1.4.1.4.1.2 "><p>4字节</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="85%" headers="mcps1.9.9.4.1.4.1.4.1.3 "><p>"你自己的"或客户端的IP地址。</p>
</td>
</tr>
<tr><td class="idp-ltr-html-cellrowborder" valign="top" width="6%" headers="mcps1.9.9.4.1.4.1.4.1.1 "><p>Siaddr</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="9%" headers="mcps1.9.9.4.1.4.1.4.1.2 "><p>4字节</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="85%" headers="mcps1.9.9.4.1.4.1.4.1.3 "><p>表明DHCP协议流程的下一个阶段要使用的服务器的IP地址。</p>
</td>
</tr>
<tr><td class="idp-ltr-html-cellrowborder" valign="top" width="6%" headers="mcps1.9.9.4.1.4.1.4.1.1 "><p>Giaddr</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="9%" headers="mcps1.9.9.4.1.4.1.4.1.2 "><p>4字节</p>
</td>
<td class="idp-ltr-html-cellrowborder" valign="top" width="85%" headers="mcps1.9.9.4.1.4.1.4.1.3 "><p>该字段表示第一个DHCP中继的IP地址(注意:不是地址池中定义的网关)。当
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