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class=post-meta-item-text>发表于</span> <time itemprop="dateCreated datePublished" title="创建时间:2024-06-02 23:32:18" datetime=2024-06-02T23:32:18+08:00>2024-06-02</time> </span><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-folder"></i> </span><span class=post-meta-item-text>分类于</span> <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/linux/ itemprop=url rel=index><span itemprop=name>linux</span></a> </span></span><span class="post-meta-item cloudflare-page-counter" data-increment=true data-path=/2024/06/02/%E7%BB%99%E5%B1%80%E5%9F%9F%E7%BD%91%E4%B8%AD%E7%9A%84Ubuntu%E5%9B%BA%E5%AE%9A%E4%B8%8Bip/ data-title=给局域网中的Ubuntu固定下ip title=阅读次数><span class=post-meta-item-icon><i class="far fa-eye"></i> </span><span class=post-meta-item-text>阅读次数:</span> <span class=cloudflare-page-counter-count></span></span></div><div class=post-description>将一个小点,在局域网中包括类似于homelab的或者仅仅只是搭一个用来当实验环境的,在局域网内机器比较少的时候大部分DHCP会给分配相同的ip,但是这不是一定的,当机器比较多,并且上下线比较频繁时就会出现ip地址变动,这对于一些使用场景比较讨厌,所以我想把ip固定下来,先简单引…</div></div></header><div class=post-body itemprop=articleBody><p>将一个小点,在局域网中包括类似于homelab的或者仅仅只是搭一个用来当实验环境的,在局域网内机器比较少的时候大部分DHCP会给分配相同的ip,但是这不是一定的,当机器比较多,并且上下线比较频繁时就会出现ip地址变动,这对于一些使用场景比较讨厌,所以我想把ip固定下来,先简单引用下DHCP的原理,他分为下面几个阶段<h3 id=DHCP发现(DISCOVER)><a class=headerlink href=#DHCP发现(DISCOVER) title=DHCP发现(DISCOVER)></a>DHCP发现(DISCOVER)</h3><p>client在物理子网上发送广播来寻找可用的服务器。网络管理员可以配置一个本地路由来转发DHCP包给另一个子网上的DHCP服务器。该client实现生成一个目的地址为255.255.255.255或者一个子网广播地址的UDP包。<p>客户也可以申请它使用的最后一个IP地址(在下面的例子里为192.168.1.100)。如果该客户所在的网络中此IP仍然可用,服务器就可以准许该申请。否则,就要看该服务器是授权的还是非授权的。授权服务器会拒绝请求,使得客户立刻申请一个新的IP。非授权服务器仅仅忽略掉请求,导致一个客户端请求的超时,于是客户端就会放弃此请求而去申请一个新的IP地址。<h3 id=DHCP提供(OFFER)><a class=headerlink href=#DHCP提供(OFFER) title=DHCP提供(OFFER)></a>DHCP提供(OFFER)</h3><p>当DHCP服务器收到一个来自客户的IP租约请求时,它会提供一个IP租约。DHCP为客户保留一个IP地址,然后通过网络单播一个DHCPOFFER消息给客户。该消息包含客户的MAC地址、服务器提供的IP地址、子网掩码、租期以及提供IP的DHCP服务器的IP。<p>服务器基于在CHADDR字段指定的客户硬件地址来检查配置。这里的服务器,192.168.1.1,将IP地址指定于YIADDR字段。<h3 id=DHCP请求(REQUEST)><a class=headerlink href=#DHCP请求(REQUEST) title=DHCP请求(REQUEST)></a>DHCP请求(REQUEST)</h3><p>当客户PC收到一个IP租约提供时,它必须告诉所有其他的DHCP服务器它已经接受了一个租约提供。因此,该客户会发送一个DHCPREQUEST消息,其中包含提供租约的服务器的IP。当其他DHCP服务器收到了该消息后,它们会收回所有可能已提供给该客户的租约。然后它们把曾经给该客户保留的那个地址重新放回到可用地址池中,这样,它们就可以为其他计算机分配这个地址。任意数量的DHCP服务器都可以响应同一个IP租约请求,但是每一个客户网卡只能接受一个租约提供。<h3 id=DHCP确认(Acknowledge,ACK)><a class=headerlink href=#DHCP确认(Acknowledge,ACK) title=DHCP确认(Acknowledge,ACK)></a>DHCP确认(Acknowledge,ACK)</h3><p>当DHCP服务器收到来自客户的REQUEST消息后,它就开始了配置过程的最后阶段。这个响应阶段包括发送一个DHCPACK包给客户。这个包包含租期和客户可能请求的其他所有配置信息。这时候,TCP/IP配置过程就完成了。<p>该服务器响应请求并发送响应给客户。整个系统期望客户来根据选项来配置其网卡。<h3 id=DHCP释放(RELEASE)><a class=headerlink href=#DHCP释放(RELEASE) title=DHCP释放(RELEASE)></a>DHCP释放(RELEASE)</h3><p>客户端向DHCP服务器发送一个请求以释放DHCP资源,并注销其IP地址。鉴于客户端更多的时候并不清楚何时用户会将其从网络中移除,此协议不会托管“DHCP释放的发送”。<h3 id=DHCP-NAK><a title="DHCP NAK" class=headerlink href=#DHCP-NAK></a>DHCP NAK</h3><p>服务器回复客户,客户要求的IP不能被分配。<h1 id=Ubuntu><a class=headerlink href=#Ubuntu title=Ubuntu></a>Ubuntu</h1><p>而对于Ubuntu,现在较新版本的设置方式也有点变化,比如我用的是22.04<figure class="highlight shell"><table><tr><td class=gutter><pre><span class=line>1</span><br></pre><td class=code><pre><span class=line>cd /etc/netplan/</span><br></pre></table></figure><p>先去这个目录下查看配置文件<br>我们要找的是这个 <code>00-installer-config.yaml</code> 文件<br><img loading=lazy src=https://img.nicksxs.me/blog/2vQ0nG.png><br>原本的是长这样<br><img loading=lazy src=https://img.nicksxs.me/blog/pHOYwe.png><br>默认是通过dhcp分配ip<br>我们要改成静态ip<figure class="highlight yaml"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br></pre><td class=code><pre><span class=line><span class=attr>network:</span></span><br><span class=line> <span class=attr>renderer:</span> <span class=string>networkd</span></span><br><span class=line> <span class=attr>ethernets:</span></span><br><span class=line> <span class=attr>ens33:</span></span><br><span class=line> <span class=attr>addresses:</span></span><br><span class=line> <span class=bullet>-</span> <span class=number>192.168</span><span class=number>.1</span><span class=string>.xx/24</span></span><br><span class=line> <span class=attr>nameservers:</span></span><br><span class=line> <span class=attr>addresses:</span> [<span class=number>114.114</span><span class=number>.114</span><span class=number>.114</span>, <span class=number>233.5</span><span class=number>.5</span><span class=number>.5</span>]</span><br><span class=line> <span class=attr>routes:</span></span><br><span class=line> <span class=bullet>-</span> <span class=attr>to:</span> <span class=string>default</span></span><br><span class=line> <span class=attr>via:</span> <span class=number>192.168</span><span class=number>.1</span><span class=number>.1</span></span><br><span class=line> <span class=attr>version:</span> <span class=number>2</span></span><br></pre></table></figure><p>解释一下 ethernets中的ens33表示我们的网卡接口的标识<br>可以通过 <code>ip addr</code> 查看<br><img loading=lazy src=https://img.nicksxs.me/blog/1gipDk.png><br>第一个是本地回环,第二个可以看下是否跟内网ip对应上,如果是的话就这个ens33<br>然后就是addresses填的地址,就是我们想要固定的ip地址,记得得是自己局域网网段的<br>上面只是个示例,然后是nameservers里的是dns服务器,也是按需填写<br>这里的114.114.114.114跟233.5.5.5分别是电信跟阿里云的,仅供参考<br>然后是routes就是网关地址,按自己的环境填写,网络没有任何特殊处理的一般就是路由器<br>接下去就是应用这个配置<figure class="highlight shell"><table><tr><td class=gutter><pre><span class=line>1</span><br></pre><td class=code><pre><span class=line>sudo netplan apply</span><br></pre></table></figure><p>这样ip配置就生效了<br>可以通过<br><code>ip addr show ens33</code>查看</div><footer class=post-footer><div class="affiliate-creative affiliate-creative--post-end" data-affiliate-id=tencent-cloud-server><a rel="sponsored noopener" aria-label=腾讯云服务器优惠 href=https://cloud.tencent.com/act/cps/redirect?redirect=6544&cps_key=2e33a1eedb380997d03618b4a5ba6ca7&from=console target=_blank><img alt="腾讯云 AI 焕新云服务器优惠" decoding=async height=241 loading=lazy src=/uploads/affiliate/tencent-cloud-server.webp width=690> </a><span class=affiliate-disclosure>推广</span></div><div class=reward-container><div>请我一杯咖啡吧!</div><button>赞赏</button><div class=post-reward><div><img alt="Nicksxs 微信" src=https://i.loli.net/2020/01/12/NUlWanT31E8LQGx.png><span>微信</span></div><div><img alt="Nicksxs 支付宝" src=https://ooo.0o0.ooo/2016/08/17/57b421e773057.jpg><span>支付宝</span></div></div></div><div class=post-copyright><ul><li class=post-copyright-author><strong>本文作者: </strong>Nicksxs<li 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