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+<table class="head">
+  <tr>
+    <td class="head-ltitle">IPFW(4)</td>
+    <td class="head-vol">Device Drivers Manual</td>
+    <td class="head-rtitle">IPFW(4)</td>
+  </tr>
+</table>
+<div class="manual-text">
+<section class="Sh">
+<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
+<p class="Pp"><code class="Nm">ipfw</code> &#x2014; <span class="Nd">IP packet
+    filter and traffic accounting</span></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
+<p class="Pp">To compile the driver into the kernel, place the following option
+    in the kernel configuration file:</p>
+<div class="Bd Pp Bd-indent"><code class="Cd">options IPFIREWALL</code></div>
+<p class="Pp">Other related kernel options which may also be useful are:</p>
+<div class="Bd Pp Bd-indent"><code class="Cd">options
+  IPFIREWALL_DEFAULT_TO_ACCEPT</code>
+<br/>
+<code class="Cd">options IPDIVERT</code>
+<br/>
+<code class="Cd">options IPFIREWALL_NAT</code>
+<br/>
+<code class="Cd">options IPFIREWALL_NAT64</code>
+<br/>
+<code class="Cd">options IPFIREWALL_NPTV6</code>
+<br/>
+<code class="Cd">options IPFIREWALL_PMOD</code>
+<br/>
+<code class="Cd">options IPFIREWALL_VERBOSE</code>
+<br/>
+<code class="Cd">options IPFIREWALL_VERBOSE_LIMIT=100</code>
+<br/>
+<code class="Cd">options LIBALIAS</code></div>
+<p class="Pp">To load the driver as a module at boot time, add the following
+    line into the <a class="Xr">loader.conf(5)</a> file:</p>
+<div class="Bd Pp Bd-indent Li">
+<pre>ipfw_load=&quot;YES&quot;</pre>
+</div>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp">The <code class="Nm">ipfw</code> system facility allows filtering,
+    redirecting, and other operations on IP packets travelling through network
+    interfaces.</p>
+<p class="Pp">The default behavior of <code class="Nm">ipfw</code> is to block
+    all incoming and outgoing traffic. This behavior can be modified, to allow
+    all traffic through the <code class="Nm">ipfw</code> firewall by default, by
+    enabling the <code class="Dv">IPFIREWALL_DEFAULT_TO_ACCEPT</code> kernel
+    option. This option may be useful when configuring
+    <code class="Nm">ipfw</code> for the first time. If the default
+    <code class="Nm">ipfw</code> behavior is to allow everything, it is easier
+    to cope with firewall-tuning mistakes which may accidentally block all
+    traffic.</p>
+<p class="Pp">When using <a class="Xr">natd(8)</a> in conjunction with
+    <code class="Nm">ipfw</code> as NAT facility, the kernel option
+    <code class="Dv">IPDIVERT</code> enables diverting packets to
+    <a class="Xr">natd(8)</a> for translation.</p>
+<p class="Pp">When using the in-kernel NAT facility of
+    <code class="Nm">ipfw</code>, the kernel option
+    <code class="Dv">IPFIREWALL_NAT</code> enables basic
+    <a class="Xr">libalias(3)</a> functionality in the kernel.</p>
+<p class="Pp">When using any of the IPv4 to IPv6 transition mechanisms in
+    <code class="Nm">ipfw</code>, the kernel option
+    <code class="Dv">IPFIREWALL_NAT64</code> enables all of these NAT64 methods
+    in the kernel.</p>
+<p class="Pp">When using the IPv6 network prefix translation facility of
+    <code class="Nm">ipfw</code>, the kernel option
+    <code class="Dv">IPFIREWALL_NPTV6</code> enables this functionality in the
+    kernel.</p>
+<p class="Pp">When using the packet modification facility of
+    <code class="Nm">ipfw</code>, the kernel option
+    <code class="Dv">IPFIREWALL_PMOD</code> enables this functionality in the
+    kernel.</p>
+<p class="Pp">To enable logging of packets passing through
+    <code class="Nm">ipfw</code>, enable the
+    <code class="Dv">IPFIREWALL_VERBOSE</code> kernel option. The
+    <code class="Dv">IPFIREWALL_VERBOSE_LIMIT</code> option will prevent
+    <a class="Xr">syslogd(8)</a> from flooding system logs or causing local
+    Denial of Service. This option may be set to the number of packets which
+    will be logged on a per-entry basis before the entry is rate-limited.</p>
+<p class="Pp">When using the in-kernel NAT facility of
+    <code class="Nm">ipfw</code>, the kernel option
+    <code class="Dv">LIBALIAS</code> enables full <a class="Xr">libalias(3)</a>
+    functionality in the kernel. Full functionality refers to included support
+    for ftp, bbt, skinny, irc, pptp and smedia packets, which are missing in the
+    basic <a class="Xr">libalias(3)</a> functionality accomplished with the
+    <code class="Dv">IPFIREWALL_NAT</code> kernel option.</p>
+<p class="Pp">The user interface for <code class="Nm">ipfw</code> is implemented
+    by the <a class="Xr">ipfw(8)</a> utility, so please refer to the
+    <a class="Xr">ipfw(8)</a> man page for a complete description of the
+    <code class="Nm">ipfw</code> capabilities and how to use it.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
+  ALSO</a></h1>
+<p class="Pp"><a class="Xr">setsockopt(2)</a>, <a class="Xr">libalias(3)</a>,
+    <a class="Xr">divert(4)</a>, <a class="Xr">ip(4)</a>,
+    <a class="Xr">ip6(4)</a>, <a class="Xr">ipfw(8)</a>,
+    <a class="Xr">natd(8)</a>, <a class="Xr">sysctl(8)</a>,
+    <a class="Xr">syslogd(8)</a>, <a class="Xr">pfil(9)</a></p>
+</section>
+</div>
+<table class="foot">
+  <tr>
+    <td class="foot-date">August 19, 2020</td>
+    <td class="foot-os">FreeBSD 15.0</td>
+  </tr>
+</table>