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<div class="search">
|
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|
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<!-- <li><a href="#"><strong>find</strong> - 指定目录下查找文件。</a></li> -->
|
||
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|
||
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|
||
<span class="split"></span>
|
||
<a target="_blank" href="https://github.com/jaywcjlove/linux-command/edit/master/command/netstat.md">添加实例</a>
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appearance: none; }
|
||
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|
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|
||
markdown-style .octicon-video { border: 1px solid #d0d7de !important; border-radius: 6px !important; display: block; } markdown-style .octicon-video summary { border-bottom: 1px solid #d0d7de !important; padding: 8px 16px !important; cursor: pointer; } markdown-style .octicon-video > video { display: block !important; max-width: 100% !important; padding: 2px; box-sizing: border-box; border-bottom-right-radius: 6px !important; border-bottom-left-radius: 6px !important; } markdown-style details.octicon-video:not([open])>*:not(summary) { display: none !important; } markdown-style details.octicon-video:not([open]) > summary { border-bottom: 0 !important; } markdown-style h1 .octicon-link, markdown-style h2 .octicon-link, markdown-style h3 .octicon-link, markdown-style h4 .octicon-link, markdown-style h5 .octicon-link, markdown-style h6 .octicon-link { color: var(--color-fg-default); vertical-align: middle; visibility: hidden; } markdown-style h1:hover .anchor, markdown-style h2:hover .anchor, markdown-style h3:hover .anchor, markdown-style h4:hover .anchor, markdown-style h5:hover .anchor, markdown-style h6:hover .anchor { text-decoration: none; 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overflow: hidden; } markdown-style span.float-left span { margin: 13px 0 0; } markdown-style span.float-right { display: block; float: right; margin-left: 13px; overflow: hidden; } markdown-style span.float-right>span { display: block; margin: 13px auto 0; overflow: hidden; text-align: right; } markdown-style code, markdown-style tt { padding: .2em .4em; margin: 0; font-size: 85%; background-color: var(--color-neutral-muted); border-radius: 6px; } markdown-style code br, markdown-style tt br { display: none; } markdown-style del code { text-decoration: inherit; } markdown-style pre code { font-size: 100%; } markdown-style pre>code { padding: 0; margin: 0; word-break: normal; white-space: pre; background: transparent; border: 0; } markdown-style pre { position: relative; font-size: 85%; line-height: 1.45; background-color: var(--color-canvas-subtle); border-radius: 6px; } markdown-style pre code, markdown-style pre tt { display: inline; max-width: auto; padding: 0; margin: 0; overflow: visible; line-height: inherit; word-wrap: normal; background-color: transparent; border: 0; } markdown-style pre > code { padding: 16px; overflow: auto; display: block; } markdown-style .csv-data td, markdown-style .csv-data th { padding: 5px; overflow: hidden; font-size: 12px; line-height: 1; text-align: left; white-space: nowrap; } markdown-style .csv-data .blob-num { padding: 10px 8px 9px; text-align: right; background: var(--color-canvas-default); border: 0; } markdown-style .csv-data tr { border-top: 0; } markdown-style .csv-data th { font-weight: 600; background: var(--color-canvas-subtle); border-top: 0; } markdown-style .footnotes { font-size: 12px; color: var(--color-fg-muted); border-top: 1px solid var(--color-border-default); } markdown-style .footnotes ol { padding-left: 16px; } markdown-style .footnotes li { position: relative; } markdown-style .footnotes li:target::before { position: absolute; top: -8px; right: -8px; bottom: -8px; left: -24px; pointer-events: none; content: ""; border: 2px solid var(--color-accent-emphasis); 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|
||
</style>
|
||
<slot></slot>
|
||
`;
|
||
class MarkdownStyle extends HTMLElement {
|
||
constructor() {
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||
super();
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this.shadow = this.attachShadow({ mode: 'open' });
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this.shadow.appendChild(__TEMPLATE__.content.cloneNode(true));
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||
const style = Array.prototype.slice
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this.theme = document.documentElement.dataset.colorMode;
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||
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||
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||
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|
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|
||
customElements.define('markdown-style', MarkdownStyle);</script><markdown-style style="max-width: 960px; margin: 0 auto 60px auto; padding: 8px;" class="markdown-style">
|
||
<h1 id="netstat"><a class="anchor" aria-hidden="true" tabindex="-1" href="#netstat"><span class="octicon octicon-link"></span></a>netstat</h1>
|
||
<p>查看Linux中网络系统状态信息</p>
|
||
<h2 id="补充说明"><a class="anchor" aria-hidden="true" tabindex="-1" href="#补充说明"><span class="octicon octicon-link"></span></a>补充说明</h2>
|
||
<p><strong>netstat命令</strong> 用来打印Linux中网络系统的状态信息，可让你得知整个Linux系统的网络情况。</p>
|
||
<h3 id="语法"><a class="anchor" aria-hidden="true" tabindex="-1" href="#语法"><span class="octicon octicon-link"></span></a>语法</h3>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1">netstat<span class="token punctuation">(</span>选项<span class="token punctuation">)</span>
|
||
</span></code><div onclick="copied(this)" data-code="netstat(选项)
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<h3 id="选项"><a class="anchor" aria-hidden="true" tabindex="-1" href="#选项"><span class="octicon octicon-link"></span></a>选项</h3>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1">-a或--all：显示所有连线中的Socket；
|
||
</span><span class="code-line line-number" line="2">-A<span class="token operator"><</span>网络类型<span class="token operator">></span>或--<span class="token operator"><</span>网络类型<span class="token operator">></span>：列出该网络类型连线中的相关地址；
|
||
</span><span class="code-line line-number" line="3">-c或--continuous：持续列出网络状态；
|
||
</span><span class="code-line line-number" line="4">-C或--cache：显示路由器配置的快取信息；
|
||
</span><span class="code-line line-number" line="5">-e或--extend：显示网络其他相关信息；
|
||
</span><span class="code-line line-number" line="6">-F或--fib：显示FIB；
|
||
</span><span class="code-line line-number" line="7">-g或--groups：显示多重广播功能群组组员名单；
|
||
</span><span class="code-line line-number" line="8">-h或--help：在线帮助；
|
||
</span><span class="code-line line-number" line="9">-i或--interfaces：显示网络界面信息表单；
|
||
</span><span class="code-line line-number" line="10">-l或--listening：显示监控中的服务器的Socket；
|
||
</span><span class="code-line line-number" line="11">-M或--masquerade：显示伪装的网络连线；
|
||
</span><span class="code-line line-number" line="12">-n或--numeric：直接使用ip地址，而不通过域名服务器；
|
||
</span><span class="code-line line-number" line="13">-N或--netlink或--symbolic：显示网络硬件外围设备的符号连接名称；
|
||
</span><span class="code-line line-number" line="14">-o或--timers：显示计时器；
|
||
</span><span class="code-line line-number" line="15">-p或--programs：显示正在使用Socket的程序识别码和程序名称；
|
||
</span><span class="code-line line-number" line="16">-r或--route：显示Routing Table；
|
||
</span><span class="code-line line-number" line="17">-s或--statistice：显示网络工作信息统计表；
|
||
</span><span class="code-line line-number" line="18">-t或--tcp：显示TCP传输协议的连线状况；
|
||
</span><span class="code-line line-number" line="19">-u或--udp：显示UDP传输协议的连线状况；
|
||
</span><span class="code-line line-number" line="20">-v或--verbose：显示指令执行过程；
|
||
</span><span class="code-line line-number" line="21">-V或--version：显示版本信息；
|
||
</span><span class="code-line line-number" line="22">-w或--raw：显示RAW传输协议的连线状况；
|
||
</span><span class="code-line line-number" line="23">-x或--unix：此参数的效果和指定<span class="token string">"-A unix"</span>参数相同；
|
||
</span><span class="code-line line-number" line="24">--ip或--inet：此参数的效果和指定<span class="token string">"-A inet"</span>参数相同。
|
||
</span></code><div onclick="copied(this)" data-code="-a或--all：显示所有连线中的Socket；
|
||
-A<网络类型>或--<网络类型>：列出该网络类型连线中的相关地址；
|
||
-c或--continuous：持续列出网络状态；
|
||
-C或--cache：显示路由器配置的快取信息；
|
||
-e或--extend：显示网络其他相关信息；
|
||
-F或--fib：显示FIB；
|
||
-g或--groups：显示多重广播功能群组组员名单；
|
||
-h或--help：在线帮助；
|
||
-i或--interfaces：显示网络界面信息表单；
|
||
-l或--listening：显示监控中的服务器的Socket；
|
||
-M或--masquerade：显示伪装的网络连线；
|
||
-n或--numeric：直接使用ip地址，而不通过域名服务器；
|
||
-N或--netlink或--symbolic：显示网络硬件外围设备的符号连接名称；
|
||
-o或--timers：显示计时器；
|
||
-p或--programs：显示正在使用Socket的程序识别码和程序名称；
|
||
-r或--route：显示Routing Table；
|
||
-s或--statistice：显示网络工作信息统计表；
|
||
-t或--tcp：显示TCP传输协议的连线状况；
|
||
-u或--udp：显示UDP传输协议的连线状况；
|
||
-v或--verbose：显示指令执行过程；
|
||
-V或--version：显示版本信息；
|
||
-w或--raw：显示RAW传输协议的连线状况；
|
||
-x或--unix：此参数的效果和指定"-A unix"参数相同；
|
||
--ip或--inet：此参数的效果和指定"-A inet"参数相同。
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<h3 id="实例"><a class="anchor" aria-hidden="true" tabindex="-1" href="#实例"><span class="octicon octicon-link"></span></a>实例</h3>
|
||
<p><strong>列出所有端口 (包括监听和未监听的)</strong></p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token function">netstat</span> <span class="token parameter variable">-a</span> <span class="token comment">#列出所有端口</span>
|
||
</span><span class="code-line line-number" line="2"><span class="token function">netstat</span> <span class="token parameter variable">-at</span> <span class="token comment">#列出所有tcp端口</span>
|
||
</span><span class="code-line line-number" line="3"><span class="token function">netstat</span> <span class="token parameter variable">-au</span> <span class="token comment">#列出所有udp端口 </span>
|
||
</span></code><div onclick="copied(this)" data-code="netstat -a #列出所有端口
|
||
netstat -at #列出所有tcp端口
|
||
netstat -au #列出所有udp端口
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p><strong>列出所有处于监听状态的 Sockets</strong></p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token function">netstat</span> <span class="token parameter variable">-l</span> <span class="token comment">#只显示监听端口</span>
|
||
</span><span class="code-line line-number" line="2"><span class="token function">netstat</span> <span class="token parameter variable">-lt</span> <span class="token comment">#只列出所有监听 tcp 端口</span>
|
||
</span><span class="code-line line-number" line="3"><span class="token function">netstat</span> <span class="token parameter variable">-lu</span> <span class="token comment">#只列出所有监听 udp 端口</span>
|
||
</span><span class="code-line line-number" line="4"><span class="token function">netstat</span> <span class="token parameter variable">-lx</span> <span class="token comment">#只列出所有监听 UNIX 端口</span>
|
||
</span></code><div onclick="copied(this)" data-code="netstat -l #只显示监听端口
|
||
netstat -lt #只列出所有监听 tcp 端口
|
||
netstat -lu #只列出所有监听 udp 端口
|
||
netstat -lx #只列出所有监听 UNIX 端口
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p><strong>显示每个协议的统计信息</strong></p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token function">netstat</span> <span class="token parameter variable">-s</span> 显示所有端口的统计信息
|
||
</span><span class="code-line line-number" line="2"><span class="token function">netstat</span> <span class="token parameter variable">-st</span> 显示TCP端口的统计信息
|
||
</span><span class="code-line line-number" line="3"><span class="token function">netstat</span> <span class="token parameter variable">-su</span> 显示UDP端口的统计信息
|
||
</span><span class="code-line line-number" line="4">
|
||
</span><span class="code-line line-number" line="5">``<span class="token variable"><span class="token variable">`</span>shell
|
||
</span></span><span class="code-line line-number" line="6"><span class="token variable">
|
||
</span></span><span class="code-line line-number" line="7"><span class="token variable"> **在netstat输出中显示 PID 和进程名称**
|
||
</span></span><span class="code-line line-number" line="8"><span class="token variable">
|
||
</span></span><span class="code-line line-number" line="9"><span class="token variable"><span class="token variable">`</span></span>``shell
|
||
</span><span class="code-line line-number" line="10"><span class="token function">netstat</span> <span class="token parameter variable">-pt</span>
|
||
</span></code><div onclick="copied(this)" data-code="netstat -s 显示所有端口的统计信息
|
||
netstat -st 显示TCP端口的统计信息
|
||
netstat -su 显示UDP端口的统计信息
|
||
|
||
```shell
|
||
|
||
**在netstat输出中显示 PID 和进程名称**
|
||
|
||
```shell
|
||
netstat -pt
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p><code>netstat -p</code>可以与其它开关一起使用，就可以添加“PID/进程名称”到netstat输出中，这样debugging的时候可以很方便的发现特定端口运行的程序。</p>
|
||
<p><strong>在netstat输出中不显示主机，端口和用户名(host, port or user)</strong></p>
|
||
<p>当你不想让主机，端口和用户名显示，使用<code>netstat -n</code>。将会使用数字代替那些名称。同样可以加速输出，因为不用进行比对查询。</p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token function">netstat</span> <span class="token parameter variable">-an</span>
|
||
</span></code><div onclick="copied(this)" data-code="netstat -an
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>如果只是不想让这三个名称中的一个被显示，使用以下命令:</p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1">netsat <span class="token parameter variable">-a</span> --numeric-ports
|
||
</span><span class="code-line line-number" line="2">netsat <span class="token parameter variable">-a</span> --numeric-hosts
|
||
</span><span class="code-line line-number" line="3">netsat <span class="token parameter variable">-a</span> --numeric-users
|
||
</span></code><div onclick="copied(this)" data-code="netsat -a --numeric-ports
|
||
netsat -a --numeric-hosts
|
||
netsat -a --numeric-users
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p><strong>持续输出netstat信息</strong></p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token function">netstat</span> <span class="token parameter variable">-c</span> <span class="token comment">#每隔一秒输出网络信息</span>
|
||
</span></code><div onclick="copied(this)" data-code="netstat -c #每隔一秒输出网络信息
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p><strong>显示系统不支持的地址族(Address Families)</strong></p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token function">netstat</span> <span class="token parameter variable">--verbose</span>
|
||
</span></code><div onclick="copied(this)" data-code="netstat --verbose
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>在输出的末尾，会有如下的信息：</p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1">netstat: no support <span class="token keyword">for</span> <span class="token variable"><span class="token variable">`</span>AF IPX' on this system.
|
||
</span></span><span class="code-line line-number" line="2"><span class="token variable">netstat: no support <span class="token keyword">for</span> <span class="token variable">`</span></span>AF AX25<span class="token string">' on this system.
|
||
</span></span><span class="code-line line-number" line="3"><span class="token string">netstat: no support for `AF X25'</span> on this system.
|
||
</span><span class="code-line line-number" line="4">netstat: no support <span class="token keyword">for</span> `AF NETROM' on this system.
|
||
</span></code><div onclick="copied(this)" data-code="netstat: no support for `AF IPX' on this system.
|
||
netstat: no support for `AF AX25' on this system.
|
||
netstat: no support for `AF X25' on this system.
|
||
netstat: no support for `AF NETROM' on this system.
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p><strong>显示核心路由信息</strong></p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token function">netstat</span> <span class="token parameter variable">-r</span>
|
||
</span></code><div onclick="copied(this)" data-code="netstat -r
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>使用<code>netstat -rn</code>显示数字格式，不查询主机名称。</p>
|
||
<p><strong>找出程序运行的端口</strong></p>
|
||
<p>并不是所有的进程都能找到，没有权限的会不显示，使用 root 权限查看所有的信息。</p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token function">netstat</span> <span class="token parameter variable">-ap</span> <span class="token operator">|</span> <span class="token function">grep</span> <span class="token function">ssh</span>
|
||
</span></code><div onclick="copied(this)" data-code="netstat -ap | grep ssh
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>找出运行在指定端口的进程：</p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token function">netstat</span> <span class="token parameter variable">-an</span> <span class="token operator">|</span> <span class="token function">grep</span> <span class="token string">':80'</span>
|
||
</span></code><div onclick="copied(this)" data-code="netstat -an | grep ':80'
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p><strong>通过端口找进程ID</strong></p>
|
||
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line line-number" line="1"><span class="token function">netstat</span> -anp<span class="token operator">|</span><span class="token function">grep</span> <span class="token number">8081</span> <span class="token operator">|</span> <span class="token function">grep</span> LISTEN<span class="token operator">|</span><span class="token function">awk</span> <span class="token string">'{printf $7}'</span><span class="token operator">|</span><span class="token function">cut</span> -d/ <span class="token parameter variable">-f1</span>
|
||
</span></code><div onclick="copied(this)" data-code="netstat -anp|grep 8081 | grep LISTEN|awk '{printf $7}'|cut -d/ -f1
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p><strong>显示网络接口列表</strong></p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token function">netstat</span> <span class="token parameter variable">-i</span>
|
||
</span></code><div onclick="copied(this)" data-code="netstat -i
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>显示详细信息，像是ifconfig使用<code>netstat -ie</code>。</p>
|
||
<p><strong>IP和TCP分析</strong></p>
|
||
<p>查看连接某服务端口最多的的IP地址：</p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token function">netstat</span> <span class="token parameter variable">-ntu</span> <span class="token operator">|</span> <span class="token function">grep</span> :80 <span class="token operator">|</span> <span class="token function">awk</span> <span class="token string">'{print $5}'</span> <span class="token operator">|</span> <span class="token function">cut</span> -d: <span class="token parameter variable">-f1</span> <span class="token operator">|</span> <span class="token function">awk</span> <span class="token string">'{++ip[$1]} END {for(i in ip) print ip[i],"\t",i}'</span> <span class="token operator">|</span> <span class="token function">sort</span> <span class="token parameter variable">-nr</span>
|
||
</span></code><div onclick="copied(this)" data-code="netstat -ntu | grep :80 | awk '{print $5}' | cut -d: -f1 | awk '{++ip[$1]} END {for(i in ip) print ip[i],"\t",i}' | sort -nr
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>TCP各种状态列表：</p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token function">netstat</span> <span class="token parameter variable">-nt</span> <span class="token operator">|</span> <span class="token function">grep</span> <span class="token parameter variable">-e</span> <span class="token number">127.0</span>.0.1 <span class="token parameter variable">-e</span> <span class="token number">0.0</span>.0.0 <span class="token parameter variable">-e</span> ::: <span class="token parameter variable">-v</span> <span class="token operator">|</span> <span class="token function">awk</span> <span class="token string">'/^tcp/ {++state[$NF]} END {for(i in state) print i,"\t",state[i]}'</span>
|
||
</span></code><div onclick="copied(this)" data-code="netstat -nt | grep -e 127.0.0.1 -e 0.0.0.0 -e ::: -v | awk '/^tcp/ {++state[$NF]} END {for(i in state) print i,"\t",state[i]}'
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>查看phpcgi进程数，如果接近预设值，说明不够用，需要增加：</p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token function">netstat</span> <span class="token parameter variable">-anpo</span> <span class="token operator">|</span> <span class="token function">grep</span> <span class="token string">"php-cgi"</span> <span class="token operator">|</span> <span class="token function">wc</span> <span class="token parameter variable">-l</span>
|
||
</span></code><div onclick="copied(this)" data-code="netstat -anpo | grep "php-cgi" | wc -l
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<h2 id="扩展知识"><a class="anchor" aria-hidden="true" tabindex="-1" href="#扩展知识"><span class="octicon octicon-link"></span></a>扩展知识</h2>
|
||
<h3 id="网络连接状态详解"><a class="anchor" aria-hidden="true" tabindex="-1" href="#网络连接状态详解"><span class="octicon octicon-link"></span></a>网络连接状态详解</h3>
|
||
<p><strong>共有12中可能的状态</strong>，前面11种是按照TCP连接建立的三次握手和TCP连接断开的四次挥手过程来描述的：</p>
|
||
<ol>
|
||
<li>
|
||
<p>LISTEN：首先服务端需要打开一个socket进行监听，状态为 LISTEN，侦听来自远方TCP端口的连接请求 ；</p>
|
||
</li>
|
||
<li>
|
||
<p>SYN_SENT：客户端通过应用程序调用connect进行active open，于是客户端tcp发送一个SYN以请求建立一个连接，之后状态置为 SYN_SENT，在发送连接请求后等待匹配的连接请求；</p>
|
||
</li>
|
||
<li>
|
||
<p>SYN_RECV：服务端应发出ACK确认客户端的 SYN，同时自己向客户端发送一个SYN，之后状态置为，在收到和发送一个连接请求后等待对连接请求的确认；</p>
|
||
</li>
|
||
<li>
|
||
<p>ESTABLISHED：代表一个打开的连接，双方可以进行或已经在数据交互了， 代表一个打开的连接，数据可以传送给用户；</p>
|
||
</li>
|
||
<li>
|
||
<p>FIN_WAIT1：主动关闭(active close)端应用程序调用close，于是其TCP发出FIN请求主动关闭连接，之后进入FIN_WAIT1状态， 等待远程TCP的连接中断请求，或先前的连接中断请求的确认；</p>
|
||
</li>
|
||
<li>
|
||
<p>CLOSE_WAIT：被动关闭(passive close)端TCP接到FIN后，就发出ACK以回应FIN请求(它的接收也作为文件结束符传递给上层应用程序)，并进入CLOSE_WAIT， 等待从本地用户发来的连接中断请求；</p>
|
||
</li>
|
||
<li>
|
||
<p>FIN_WAIT2：主动关闭端接到ACK后，就进入了 FIN-WAIT-2，从远程TCP等待连接中断请求；</p>
|
||
</li>
|
||
<li>
|
||
<p>LAST_ACK：被动关闭端一段时间后，接收到文件结束符的应用程 序将调用CLOSE关闭连接，这导致它的TCP也发送一个 FIN,等待对方的ACK.就进入了LAST-ACK，等待原来发向远程TCP的连接中断请求的确认；</p>
|
||
</li>
|
||
<li>
|
||
<p>TIME_WAIT:在主动关闭端接收到FIN后，TCP 就发送ACK包，并进入TIME-WAIT状态，等待足够的时间以确保远程TCP接收到连接中断请求的确认；</p>
|
||
</li>
|
||
<li>
|
||
<p>CLOSING: 比较少见，等待远程TCP对连接中断的确认；</p>
|
||
</li>
|
||
<li>
|
||
<p>CLOSED: 被动关闭端在接受到ACK包后，就进入了closed的状态，连接结束，没有任何连接状态；</p>
|
||
</li>
|
||
<li>
|
||
<p>UNKNOWN：未知的Socket状态；</p>
|
||
</li>
|
||
</ol>
|
||
<p><strong>常见标志位</strong></p>
|
||
<ul>
|
||
<li>
|
||
<p>SYN: (同步序列编号,Synchronize Sequence Numbers)该标志仅在三次握手建立TCP连接时有效。表示一个新的TCP连接请求。</p>
|
||
</li>
|
||
<li>
|
||
<p>ACK: (确认编号,Acknowledgement Number)是对TCP请求的确认标志,同时提示对端系统已经成功接收所有数据。</p>
|
||
</li>
|
||
<li>
|
||
<p>FIN: (结束标志,FINish)用来结束一个TCP回话.但对应端口仍处于开放状态,准备接收后续数据。</p>
|
||
</li>
|
||
</ul>
|
||
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markdown-style pre:hover .copied {
|
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|
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markdown-style pre:hover .copied:hover {
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markdown-style pre:hover .copied:active,
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markdown-style pre .copied.active {
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markdown-style pre .copied .octicon-copy {
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markdown-style pre .copied .octicon-check {
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markdown-style pre .active .octicon-copy {
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