unixdigest/openbsd-router-guide
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<td>
<h1 class="title">OpenBSD Router Guide</h1>
<h4>Network segmenting firewall, DHCP, DNS with Unbound, domain blocking and much more<br>
<span style="font-size:x-small;font-weight:initial;">OpenBSD: 6.8 · Published: 2020-11-05 · Updated: 2021-01-08 · Version: 1.6.1</span>
<span style="font-size:x-small;font-weight:initial;">OpenBSD: 6.8 · Published: 2020-11-05 · Updated: 2021-01-15 · Version: 1.6.2</span>
</h4>
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<p style="margin-top:30px;font-size:larger;">Table of contents</p>
<ul>
<li><a href="#typographical-conventions">Typographical conventions used in this guide</a></li>
<li><a href="#why-a-firewall">Why a firewall?</a></li>
<li><a href="#the-hardware">The hardware</a></li>
<li><a href="#why-openbsd">Why OpenBSD?</a></li>
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</li>
</ul>
<h2 id="typographical-conventions">Typographical conventions used in this guide</h2>
<ul>
<li><code>Fixed-width</code> (mono-spaced) font is used for terminal commands, file names and paths, configuration parameters, etc.</li>
<li>Terminal commands that must be typed as the <code>root</code> user is prefixed with the <code>#</code> pound sign.</li>
<li>Terminal commands that can be typed as the regular user is prefixed with the <code>$</code> dollar sign.</li>
</ul>
<h2 id="why-a-firewall">Why a firewall?</h2>
<p>Almost no matter how you connect to the Internet from your home or office, you need a real firewall between you and the modem or router that your ISP has provided you with.</p>
<p>Very rarely do consumer-grade modems or routers get firmware updates and they are often vulnerable to <a href="https://en.wikipedia.org/wiki/Home_router#Security">network attacks</a> that turns these devices into <a href="https://en.wikipedia.org/wiki/Botnet">botnets</a>, such like the <a href="https://en.wikipedia.org/wiki/Mirai_(malware)">Mirai malware</a>. Many consumer-grade modems and routers is to blame for some of the largest <a href="https://en.wikipedia.org/wiki/Distributed_denial_of_service_attack">distributed denial of service (DDoS) attacks</a>.</p>