$Id$

User-space 6rd (RFC 5569) implementation
----------------------------------------
   The u6rd daemon is a userland implementation of 6rd (RFC 5569) for
   6rd customer edge routers.  It does not provide the functionality of
   6rd relay routers.

   It runs in the user-space using the tun(4) interface and the raw
   socket interface.  This means that u6rd is not tightly coupled with
   the kernel and it will run on various operating systems and versions.

Platforms
---------
   The 6rd daemon requires the raw socket and IPv6 support for the
   tun(4) interface.

   Supported operating systems are FreeBSD and NetBSD.

Installation
------------
   % ./configure
   % make
   # make install

Configuration
-------------
   See the u6rd(8) manual page.

References
----------
   [RFC3056] B. Carpenter and K. Moore, "Connection of IPv6 Domains via IPv4
             Clouds", RFC 3056, February 2001.
   [RFC3964] P. Savola and C. Patel, "Security Considerations for 6to4",
             RFC 3964, December 2004.
   [RFC5569] R. Despres, "IPv6 Rapid Deployment on IPv4 Infrastructures
             (6rd)", RFC 5569, January 2010.
   [RFC5969] W. Townsley and O. Troan, "IPv6 Rapid Deployment on IPv4
             Infrastructures (6rd) -- Protocol Specification", August 2010.

Copyright and License
---------------------

   Copyright (c) 2012-2014 KAMADA Ken'ichi.
   All rights reserved.

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:
   1. Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
   2. Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.

   THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   SUCH DAMAGE.

-- 
KAMADA Ken'ichi