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class=post-meta-item-text>分类于</span> <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/%E6%8A%98%E8%85%BE/ itemprop=url rel=index><span itemprop=name>折腾</span></a> </span></span><span class="post-meta-item cloudflare-page-counter" data-increment=true data-path=/2024/05/05/%E6%8A%98%E8%85%BE%E8%AE%B0-%E8%AE%B2%E4%B8%80%E4%B8%8Biptables%E7%9A%84%E4%B8%80%E4%B8%AA%E5%B0%8F%E9%97%AE%E9%A2%98/ data-title=折腾记-讲一下iptables的一个小问题 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>很早之前就有用过iptables,那时候是早期版本的Ubuntu系统,配置防火墙的时候,是挺复杂的,就是在reject之前添加accept规则,并且当时很多网上资料都是在后续添加就行,这个其实在当时是有问题的,所以比较印象深刻。</div></div></header><div class=post-body itemprop=articleBody><p>很早之前就有用过iptables,那时候是早期版本的Ubuntu系统,配置防火墙的时候,是挺复杂的,就是在reject之前添加accept规则,并且当时很多网上资料都是在后续添加就行,这个其实在当时是有问题的,所以比较印象深刻。<br>这次碰到的问题是对iptables的概念不熟悉有关,因为iptables的逻辑其实也有一定问题我觉得,比如最基本的命令,<code>iptables -L</code><br>这里help显示的是会展示所有chain的rules<br><img loading=lazy src=https://img.nicksxs.me/blog/WzwlYP.png><br>但是这样完全把table概念给忽略了,如果不注明理论上应该把所有table的展示出来,或者把包含这个参数并且是默认给出filter这个table的写清楚<br>所以这次要补一下这部分概念<br>iptables里首先就是有四种table,分别是 Filter, NAT, Mangle, Raw四种内建表<br>并且层次结构是 iptables -> Tables -> Chains -> Rules.<br>filter:<br>This is the default table (if no -t option is passed). It contains the built-in chains INPUT (for packets destined to local sockets), FORWARD (for packets being routed through the box), and OUTPUT (for locally-generated packets).<br>包含 INPUT,FORWORD和OUPUT三个chain,默认就是展示这个,所以就会导致用<code>iptables -L</code> 显示不了mangle table的规则<br>nat:<br>This table is consulted when a packet that creates a new connection is encountered. It consists of three built-ins: PREROUTING (for altering packets as soon as they come in), OUTPUT (for altering locally-generated packets before routing), and POSTROUTING (for altering packets as they are about to go out).<br>nat包含 PREROUTING,OUTPUT,POSTROUTING三个chain<br>mangle:<br>This table is used for specialized packet alteration. Until kernel 2.4.17 it had two built-in chains: PREROUTING (for altering incoming packets before routing) and OUTPUT (for altering locally-generated packets before routing). Since kernel 2.4.18, three other built-in chains are also supported: INPUT (for packets coming into the box itself), FORWARD (for altering packets being routed through the box), and POSTROUTING (for altering packets as they are about to go out).<br>mangle主要用于专门的数据包更改,包含 PREROUTING,INPUT,OUTPUT,FORWARD,POSTROUTING 五个chain,注意有内核版本区别,只是现在基本没那么老的内核了<br>raw:<br>This table is used mainly for configuring exemptions from connection tracking in combination with the NOTRACK target. It registers at the netfilter hooks with higher priority and is thus called before ip_conntrack, or any other IP tables. It provides the following built-in chains: PREROUTING (for packets arriving via any network interface) OUTPUT (for packets generated by local processes)<br>包含 PREROUTING和OUTPUT,主要用来配置例外<br>chain内部会有实际的rule规则,这个具体后面可以介绍</div><footer class=post-footer><div class="affiliate-creative affiliate-creative--post-end" data-affiliate-id=tencent-cloud-general><a rel="sponsored noopener" aria-label=腾讯云产品优惠 href=https://cloud.tencent.com/act/cps/redirect?redirect=2446&cps_key=2e33a1eedb380997d03618b4a5ba6ca7&from=console target=_blank><img alt=腾讯云服务器、数据库和云产品优惠 decoding=async height=419 loading=lazy src=/uploads/affiliate/tencent-cloud-general.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 class=post-copyright-link><strong>本文链接:</strong> <a href=https://nicksxs.me/2024/05/05/%E6%8A%98%E8%85%BE%E8%AE%B0-%E8%AE%B2%E4%B8%80%E4%B8%8Biptables%E7%9A%84%E4%B8%80%E4%B8%AA%E5%B0%8F%E9%97%AE%E9%A2%98/ title=折腾记-讲一下iptables的一个小问题>https://nicksxs.me/2024/05/05/折腾记-讲一下iptables的一个小问题/</a><li class=post-copyright-license><strong>版权声明: </strong>本博客所有文章除特别声明外,均采用 <a href=https://creativecommons.org/licenses/by-nc-sa/4.0/ rel=noopener target=_blank><i class="fab fa-fw fa-creative-commons"></i>BY-NC-SA</a> 许可协议。转载请注明出处!</ul></div><div class=post-tags><a href=/tags/%E6%8A%98%E8%85%BE/ rel=tag># 折腾</a></div><div class=post-nav><div class=post-nav-item><a href=/2024/04/28/%E6%8A%98%E8%85%BE%E8%AE%B0-%E7%BB%99%E7%8E%A9%E5%AE%A2%E4%BA%91%E8%A3%85%E4%B8%8Acasaos/ rel=prev title=折腾记-给玩客云装上casaos><i class="fa fa-angle-left"></i> 折腾记-给玩客云装上casaos</a></div><div class=post-nav-item><a title="Leetcode 31 Next Permutation 题解分析" href=/2024/05/06/Leetcode-31-Next-Permutation-%E9%A2%98%E8%A7%A3%E5%88%86%E6%9E%90/ rel=next>Leetcode 31 Next Permutation 题解分析 <i class="fa fa-angle-right"></i></a></div></div></footer></article></div><div class=comments id=disqus_thread><noscript>Please enable JavaScript to view the comments powered by Disqus.</noscript></div></div></main><footer class=footer><div class=footer-inner><div class=beian><a href=https://beian.miit.gov.cn/ rel=noopener target=_blank>浙ICP备16002580号-2 </a><img alt src=/uploads/beian.png><a href=https://beian.mps.gov.cn/#/query/webSearch?code=33010602011094 rel=noopener target=_blank>浙公网安备 33010602011094号</a></div><div class=copyright>© <span itemprop=copyrightYear>2026</span><span class=with-love><i class="fa fa-heart"></i> </span><span class=author itemprop=copyrightHolder>Nicksxs</span></div></div></footer><div class="toggle sidebar-toggle" role=button><span class=toggle-line></span><span class=toggle-line></span><span class=toggle-line></span></div><div class=sidebar-dimmer></div><div aria-label=返回顶部 class=back-to-top role=button><i class="fa fa-arrow-up fa-lg"></i><span>0%</span></div><a aria-label="在 GitHub 上关注我" title="在 GitHub 上关注我" class=github-corner href=https://github.com/nicksxs rel=noopener target=_blank><svg viewbox="0 0 250 250" aria-hidden=true height=80 width=80><path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path><path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" style="transform-origin:130px 106px" class=octo-arm fill=currentColor></path><path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" class=octo-body fill=currentColor></path></svg></a><noscript><div class=noscript-warning>Theme NexT works best with JavaScript enabled</div></noscript><script data-cloudflare-page-counter-config type=application/json>{"enable":true,"endpoint":"https://counter.nicksxs.me","site":"nicksxs","local_cache":true,"timeout":5000,"icon":"far fa-eye","item_text":true}</script><script src=/js/cloudflare-page-counter.js></script><script class=next-config data-name=disqus type=application/json>{"enable":true,"shortname":"nicksxs","count":false,"i18n":{"disqus":"disqus"}}</script><script defer src=/js/third-party/comments/disqus.js></script>