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-<table class="head">
- <tr>
- <td class="head-ltitle">FAITH(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">FAITH(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">faith</code> &#x2014;
- <span class="Nd">IPv6-to-IPv4 TCP relay capturing interface</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="Cd">pseudo-device faith</code></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <code class="Nm">faith</code> interface captures IPv6 TCP
- traffic, for implementing userland IPv6-to-IPv4 TCP relay like
- <a class="Xr">faithd(8)</a>.</p>
-<p class="Pp"><code class="Nm">faith</code> interfaces are dynamically created
- and destroyed with the <a class="Xr">ifconfig(8)</a>
- <code class="Cm">create</code> and <code class="Cm">destroy</code>
- subcommands.</p>
-<p class="Pp">Special action will be taken when IPv6 TCP traffic is seen on a
- router, and the routing table suggests to route it to the
- <code class="Nm">faith</code> interface. In this case, the packet will be
- accepted by the router, regardless of the list of IPv6 interface addresses
- assigned to the router. The packet will be captured by an IPv6 TCP socket,
- if it has the <code class="Dv">IN6P_FAITH</code> flag turned on and matching
- address/port pairs. As a result, <code class="Nm">faith</code> will let you
- capture IPv6 TCP traffic to some specific destination addresses. Userland
- programs, such as <a class="Xr">faithd(8)</a> can use this behavior to relay
- IPv6 TCP traffic to IPv4 TCP traffic. The program can accept some specific
- IPv6 TCP traffic, perform <a class="Xr">getsockname(2)</a> to get the IPv6
- destination address specified by the client, and perform
- application-specific address mapping to relay IPv6 TCP to IPv4 TCP.</p>
-<p class="Pp"><code class="Dv">IN6P_FAITH</code> flag on an IPv6 TCP socket can
- be set by using <a class="Xr">setsockopt(2)</a>, with level
- <code class="Dv">IPPROTO_IPV6</code> and optname
- <code class="Dv">IPv6_FAITH</code>.</p>
-<p class="Pp">To handle error reports by ICMPv6, some ICMPv6 packets routed to
- an <code class="Nm">faith</code> interface will be delivered to IPv6 TCP, as
- well.</p>
-<p class="Pp">To understand how <code class="Nm">faith</code> can be used, take
- a look at the source code of <a class="Xr">faithd(8)</a>.</p>
-<p class="Pp">As the <code class="Nm">faith</code> interface implements
- potentially dangerous operations, great care must be taken when configuring
- it. To avoid possible misuse, the <a class="Xr">sysctl(8)</a> variable
- <code class="Li">net.inet6.ip6.keepfaith</code> must be set to
- <code class="Li">1</code> prior to using the interface. When
- <code class="Li">net.inet6.ip6.keepfaith</code> is
- <code class="Li">0</code>, no packets will be captured by the
- <code class="Nm">faith</code> interface.</p>
-<p class="Pp">The <code class="Nm">faith</code> interface is intended to be used
- on routers, not on hosts.</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">inet(4)</a>, <a class="Xr">inet6(4)</a>,
- <a class="Xr">faithd(8)</a></p>
-<p class="Pp"><cite class="Rs"><span class="RsA">Jun-ichiro itojun Hagino</span>
- and <span class="RsA">Kazu Yamamoto</span>, <span class="RsT">An
- IPv6-to-IPv4 transport relay translator</span>, <i class="RsB">RFC 3142</i>,
- <a class="RsU" href="ftp://ftp.isi.edu/in-notes/rfc3142.txt">ftp://ftp.isi.edu/in-notes/rfc3142.txt</a>,
- <span class="RsD">June 2001</span>.</cite></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The FAITH IPv6-to-IPv4 TCP relay translator first appeared in the
- WIDE hydrangea IPv6 stack.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">January 9, 2010</td>
- <td class="foot-os">NetBSD 10.1</td>
- </tr>
-</table>