614de01128
IPv6 only snapshots and FreeSBD and world IPv6 day. Can be extended and improved as needed. Add "WORLD IPV6 DAY BADGE: BLUE" image available for download from http://www.worldipv6day.org/downloads/index.html . Includes suggestions from: rwatson Approved by: simon Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems
165 lines
7.5 KiB
Text
165 lines
7.5 KiB
Text
<!DOCTYPE HTML PUBLIC "-//FreeBSD//DTD HTML 4.01 Transitional-Based Extension//EN" [
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<!-- Copyright (c) 2011 The FreeBSD Foundation
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All rights reserved.
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This documentation was written by Bjoern Zeeb under sponsorship from
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the FreeBSD Foundation.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.
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$FreeBSD$
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-->
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<!ENTITY base CDATA "..">
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<!ENTITY date "$FreeBSD$">
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<!ENTITY title "FreeBSD IPv6-only Support">
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<!ENTITY % navinclude.developers "INCLUDE">
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<!ENTITY % catnav.ipv6 "INCLUDE">
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<!ENTITY % catnav SYSTEM "ipv6.ent"> %catnav;
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<!ENTITY ipv6onlysnap "http://wiki.freebsd.org/IPv6Only">
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]>
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<html>
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&header;
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&catnav;
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<h2>IPv4, Dual-Stack and what is "IPv6-only"?</h2>
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<p>For multiple decades the Internet has been running on the Internet
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Protocol version 4 (IPv4). You may know IPv4 addresses like 192.0.2.1.
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IPv6, the Internet Protocol version 6, is the successor to that and has
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a larger address space and longer addresses like
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2001:db8:4672:6565:2026:5043:2d42:5344. A dual-stack (DS) system
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supports both address families, IPv4 and IPv6. Dual-stack is the
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default for &os; releases shipping at this time and has been since 2003.
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An IPv6-only system is one that has been configured to use only IPv6
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support; IPv4 support is completely removed from the system. Providing
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IPv6-only snapshots of &os; shows that it has no strict internal
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dependence on Internet Protocol version 4, and is ready to run in a pure
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IPv6 environment.
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</p>
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<h2>IPv6-only history</h2>
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<p>The IPv6 only kernel has started as a research project in 2008 when &os;
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<a href="&base;/doc/en_US.ISO8859-1/books/handbook/jails.html">Jails</a>
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gained IPv6 support and it became possible to have jails without IPv4.</p>
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<p>The FreeBSD kernel has long been able to be compiled for dual-stack or
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without INET6 support.
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It was time for feature parity in that area as well.
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As an intermediate step there were efforts to get the kernel compiling
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without any IP support at all, which helped to narrow down the
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problematic cases.</p>
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<p>As of
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<a href="http://svn.freebsd.org/changeset/base/221353">SVN r221353</a>
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it is now possible to compile the kernel without INET but with INET6
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support.
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</p>
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<h2>How can I get a system without INET support?</h2>
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<p>There are two ways to get this:</p>
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<ul>
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<li>The easy way is to download an IPv6-only snapshot we provide and
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test that put. See the <a href="&ipv6onlysnap;">IPv6-only</a> wiki
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page for the latest snapshot builds and download links.</li>
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<li>Alternatively you can install any FreeBSD HEAD (9.x or later) as of
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May 2nd 2011 or later and compile your own kernel. See the
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<a href ="&base;/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html">
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Handbook</a> for how to do this.</li>
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</ul>
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<h2>Doing IPv6-only when the world tries to get to dual-stack?</h2>
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<p>In a time where you hear numbers that about 4% of end users could
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actually successfully access IPv6-only services it may indeed sound
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strange. The BSD network stack however was used as a reference
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implementation for the first time of TCP/IP and again was for IPv6 and
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there are some parts of the world already that are limited to IPv6-only.
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Over time, as IPv6 deployment proceeds, we expect to see a lot more of
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this.</p>
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<p>On the other hand having the IPv4 fall back option of dual-stack hides
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a lot of IPv6 errors and omissions. Supposedly IPv6-ready software
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breaks when running without IPv4. We want to help early in the process
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to catch and fix these problems and want to encourage other software
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developers to do the same. FreeBSD is used in embedded device and
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targeting servers while at the same time people build desktop systems
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with it. This entirety allows us to provide a turnkey solution, an
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ideal platform for thorough testing.
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</p>
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<h2>FAQ</h2>
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<h3>Do you have a sample kernel configuration for me?</h3>
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<p>Yes we do. It is as simple as:
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</p>
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<pre>
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include GENERIC
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ident GENERIC-IPV6ONLY
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makeoptions MKMODULESENV+="WITHOUT_INET_SUPPORT="
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nooptions INET
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nodevice gre
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</pre>
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<h3>I am not doing kernels but desktop applications. What about me?</h3>
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<p>
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&os; ships with a lot of applications running fine on command line.
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If you prefer to test on a preconfigured graphical desktop,
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<a href="http://www.pcbsd.org/">PC-BSD</a>, a &os; derived desktop
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distribution is providing IPv6-only snapshots as well.
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</p>
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<h3>Is this limited to &os;?</h3>
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<p>No.
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While we provide the kernel and parts of user space for you to start
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with, a lot of open sources and commercial software running on a
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<span class="TRADEMARK">UNIX</span>® or
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<span class="TRADEMARK">UNIX</span>®-like operating system
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(e.g. <span class="TRADEMARK">®Linux</span>) should be able to
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compile and run on FreeBSD with minimal efforts. Also see the next
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question.
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</p>
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<h3>Does everything just work on IPv6-only in &os;</h3>
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<p>While are doing our best, some things are not yet working without
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IPv4. Very few parts of the kernel still depend on IPv4 and we are
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working on these. In user space you can find three different categories:
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</p>
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<ol>
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<li>Software that is maintained as &os; base. We are actively working
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on these as we find problems. Patches from the community are always
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welcome.</li>
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<li>Software that is shipped with &os; base but imported from a 3rd
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party project. We are trying our best to get any problems solved and
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are working with upstream vendors.<br>
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If you are part of such a project you may want to test on IPv6-only
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yourself to be really IPv6-ready with your next release! Try our
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snapshots.</li>
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<li>Software that is part of &os <a href="&base;/ports/">ports</a>
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or any other open source or commercial software running on &os;.
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We will lend a hand if needed and possible but are hoping for the
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community to make best use of our snapshots and improve the overall
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IPv6 readiness of software.</li>
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</ol>
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<!-- should we provide bsdinstall sample information? -->
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&footer;
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</body>
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</html>
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