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<p>以下命令将输出服务器上正在发生和正在发生的活动 <code>SYNC_REC</code> 数量。数量应该很低(小于 <code>5</code>)。如果该数字为两位数，则您可能正在遭受 <code>DoS</code> 攻击或被邮件轰炸。</p>
<pre class="language-bash"><code class="language-bash code-highlight"><span class="code-line">$ <span class="token function">netstat</span> <span class="token parameter variable">-n</span> -p<span class="token operator">|</span><span class="token function">grep</span> SYN_REC <span class="token operator">|</span> <span class="token function">wc</span> <span class="token parameter variable">-l</span>
</span></code></pre>
</div></div><div class="h3wrap-body"><div class="wrap h4body-not-exist"><div class="wrap-header h4wrap"><h4 id="列出发送-syn_rec-连接的唯一-ip-地址"><a aria-hidden="true" tabindex="-1" href="#列出发送-syn_rec-连接的唯一-ip-地址"><span class="icon icon-link"></span></a>列出发送 SYN_REC 连接的唯一 IP 地址</h4><div class="wrap-body">
</div></div><div class="h3wrap-body"><h4 id="列出发送-syn_rec-连接的唯一-ip-地址"><a aria-hidden="true" tabindex="-1" href="#列出发送-syn_rec-连接的唯一-ip-地址"><span class="icon icon-link"></span></a>列出发送 SYN_REC 连接的唯一 IP 地址</h4>
<pre class="wrap-text "><code class="language-bash code-highlight"><span class="code-line">$ <span class="token function">netstat</span> <span class="token parameter variable">-n</span> <span class="token parameter variable">-p</span> <span class="token operator">|</span> <span class="token function">grep</span> SYN_REC <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">awk</span> -F: <span class="token string">'{print $1}'</span>
</span></code></pre>
<!--rehype:className=wrap-text -->
<p>与上面的命令一样，该命令也列出了发送 <code>SYN_REC</code> 连接状态的节点的所有唯一 <code>IP</code> 地址</p>
</div></div></div></div></div><div class="wrap h3body-not-exist col-span-2"><div class="wrap-header h3wrap"><h3 id="每个远程-ip-的连接数"><a aria-hidden="true" tabindex="-1" href="#每个远程-ip-的连接数"><span class="icon icon-link"></span></a>每个远程 IP 的连接数</h3><div class="wrap-body">
</div></div><div class="wrap h3body-not-exist col-span-2"><div class="wrap-header h3wrap"><h3 id="每个远程-ip-的连接数"><a aria-hidden="true" tabindex="-1" href="#每个远程-ip-的连接数"><span class="icon icon-link"></span></a>每个远程 IP 的连接数</h3><div class="wrap-body">
<!--rehype:wrap-class=col-span-2-->
<pre class="wrap-text "><code class="language-bash code-highlight"><span class="code-line">$ <span class="token function">netstat</span> <span class="token parameter variable">-antu</span> <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">awk</span> -F: <span class="token string">'{print $1}'</span> <span class="token operator">|</span> <span class="token function">sort</span> <span class="token operator">|</span> <span class="token function">uniq</span> <span class="token parameter variable">-c</span> <span class="token operator">|</span> <span class="token function">sort</span> <span class="token parameter variable">-n</span>
</span></code></pre>