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      <li><i class="fa fa-calendar" aria-hidden="true"></i><time datetime="2019-07-04T11:00:50JST">Jul 4, 2019</time></li>
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    <h1 class="title">TCP代理</h1>
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<h3 id="工作原理">工作原理</h3>

<p>tcp代理，也称为tcp端口转发，工作原理就是，把proxy监听端口进来的tcp连接的数据原样转发到上级监听的一个端口。</p>

<p>上级可以是proxy的tcp代理也可以是具体的第三方服务，如果上级是tcp代理，那么就组成了转发链。至于转发链可以做什么看自己业务需求。</p>

<h3 id="使用示例">使用示例</h3>

<h4 id="转发ssh的22端口">转发ssh的22端口</h4>

<p>典型场景，一个机器A拥有公网IP，B机器和A机器在一个局域网，机器B处于内网中，外网不能直接访问。想通过ssh连接A机器的2022端口实现ssh登录B机器的ssh的22端口。</p>

<p>A机器执行：</p>

<p><code>proxy tcp -t tcp -p :2022 -T tcp -P IP_B:22</code></p>

<p>任何机器上 执行 <code>ssh root@IP_A:2022</code> 即可登录B机器。</p>

<h4 id="转发链">转发链</h4>

<p>典型场景，公网机器A由于公司或者其它网络限制导致你不能直接访问，B机器和A机器在一个局域网，机器B处于内网中，外网不能直接访问。想通过ssh连接A机器的2022端口实现ssh登录B机器的ssh的22端口，但是公网机器C你可以访问，C也可以访问A，那么你就可以这样组成转发链：你本地ssh -&gt;&gt;&gt; C -&gt;&gt;&gt; A -&gt;&gt;&gt; B，最终达到你安全访问B机器的目的。</p>

<p>A机器执行：</p>

<p><code>proxy tcp -t ws -p :2022 -T tcp -P IP_B:22</code></p>

<p>机器C执行：</p>

<p><code>proxy tcp -t tcp -p :2022 -T ws -P IP_A:2022</code></p>

<p>任何机器上，当然包括你的机器，执行 <code>ssh root@IP_C:2022</code> 即可登录B机器。</p>
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