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Miredo : open-source Teredo
============================
Copyright (C) 2004-2007 Rémi Denis-Courmont.

  Welcome to Miredo’s user’s guide!

Where to go?
=============

  If you’ve used olders versions of this program, you should read NEWS
for a summary of the most recent updates and changes.

  For detailled usage instructions, you should refer to the Unix manual
page miredo(8) which should be provided with your copy of the program.
For quick usage instructions, see below.

  See INSTALL for general instructions on how to build the package and
install the program from sources. Additionnal informations may be found
below. If you are building from the Subversion repository, run the
“./autogen.sh” script first.

  This package is distributed under the terms of the General Public
License (GPL) version 2 written by the Free Software Foundation, Inc.
for full licensing details, please read COPYING.

  If you have further questions, please send an email to:
    miredo (dash) devel (at) remlab (dot) net


What is Miredo?
================

  Miredo is an Unix daemon program which mostly implements the
“Teredo: Tunneling IPv6 over UDP through NATs” Internet proposed
standard (RFC 4380). It can provide either client or relay
functionality. A separate program, miredo-server is also included in
the package; it consists of a Teredo server.

  Miredo can be used to provide IPv6 connectivity to users behind NAT
devices, such as broadband routers. Most of these device do not support
IPv6, and do not allow forwarding of proto-41 (including 6to4).


System requirements
====================

  Miredo aims to support all POSIX-like open-source operating system
kernels with IPv6 and userland layer-3 tunneling support. See below
for system specific notes.

  Miredo is believed to be architecture-independant, but it was only
properly tested on Linux i386, with GCC 4.1, GCC 3.3 and ICC 8.0.
GCC 2.95 is purposedly not supported.

  When available, Miredo can use the following optional libraries :
 - GNU gettext for localization,
 - libcap (currently Linux-specific) for POSIX capabilities,
 - Judy dynamic arrays library for better scalability.

Linux:
-------
  Miredo runs fine on Linux kernel 2.6.9; if possible, kernel version
2.6.12 or more recent is recommended. It can run with older versions as
well, including the 2.4 branch. However, there are known problems with
the -experimental- IPv6 stack of these kernel releases; this is not
specific to the usage of Miredo.
  Miredo requires the Universal TUNTAP driver (CONFIG_TUN) and IPv6
(CONFIG_IPV6).

  For proper source address selection (RFC3484 support), kernel version
2.6.17.2 and GNU/libc 2.5 are required.

FreeBSD:
---------
  Miredo works fine with FreeBSD 5.5 and up. You can use the net/miredo
port. There is a known problem with the FreeBSD 6.2 and older; it
should mostly affect Miredo in "relay" mode.
  FreeBSD 4.11 is not supported.

OpenBSD:
---------
  OpenBSD might work. Version 3.7 was tested with older releases.

NetBSD:
--------
  NetBSD 4.0 is required, for IPv6 tunneling. Miredo should be
available through pkgsrc.

Darwin (Mac OS X):
-------------------
  Miredo works on Mac OS X (Panther, Tiger) and might work on other
Darwin variants. On Mac OS X, you will have to install a third party
tunneling driver; Miredo was tested with Mattis Nissler's tuntap from:
http://www-user.rhrk.uni-kl.de/~nissler/tuntap/

  Note that Mac OS X users should consider using Miredo-OSX from
http://www.deepdarc.com/ which provides prebuilt OS X binaries of
Miredo along with Nissler's tuntap, LibJudy and OS X specific additions
and tweaks.

DragonFly:
-----------
  Miredo should work. It is in NetBSD's pkgsrc.


Quick usage
============

Easy installation:
-------------------
  First, compile and install Miredo. Refer to INSTALL for detailled
instructions. Miredo can be installed the usual way:

# ./configure
# make
# su
# make install

  Miredo has no particular required dependencies, besides the usual
C/C++ compilers and development libraries.

  A sample configuration file is automatically installed at
/usr/local/etc/miredo.conf - unless the file already existed (which
means you are probably reinstalling or upgrading Miredo). This sample
will cause Miredo to run as a Teredo client, with “teredo.remlab.net”
(Miredo official testing Teredo server) as its Teredo server. These
default settings should be fine for most users.

Starting the program:
----------------------
  Before you start, please note that Miredo must be started by root,
and that it will detach and run in the background. If something goes
wrong, there are two ways two know what :
- read your system logs (typically /var/log/syslog),
- force Miredo to run in the foreground (that’s meant for debugging),
  by starting it with the “--foreground” command line parameter, and
  wait for about 20 seconds.

  You can now run miredo (as root!):
# /usr/local/sbin/miredo

  It will need some time to initialize, particularly if you are behind
a restricted NAT, which is frequent. After about 20 seconds, you should
have access to the IPv6 Internet through Teredo, with a public Teredo
IPv6 address on the “teredo” networking interface :

# ifconfig teredo
teredo    Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00...
          inet6 addr: 2001:0:8ac3:9ddd:0:7ffa:ad80:3464/32 Scope:...
          inet6 addr: fe80::5445:5245:444f/64 Scope:Link
          UP POINTOPOINT RUNNING NOARP  MTU:1280  Metric:1
          RX packets:5 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:500
          RX bytes:468 (468.0 b)  TX bytes:560 (560.0 b)

# ping6 -c 4 www.kame.net
PING www.kame.net(orange.kame.net) 56 data bytes
64 bytes from orange.kame.net: icmp_seq=1 ttl=50 time=558 ms
64 bytes from orange.kame.net: icmp_seq=2 ttl=50 time=585 ms
64 bytes from orange.kame.net: icmp_seq=3 ttl=50 time=562 ms
64 bytes from orange.kame.net: icmp_seq=4 ttl=50 time=552 ms

--- www.kame.net ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3003ms
rtt min/avg/max/mdev = 552.830/564.865/585.031/12.218 ms

Monitoring:
------------
  If you wish to monitor the Teredo tunnel, I suggest you use famous
network analyzer Wireshark (formerly Ethereal®) which includes a Teredo
“dissector”.

Teredo relay and/or server:
----------------------------
  Please refer to the sample configuration miredo.conf-dist for further
information. You can get a comprehensive reference of all possible
options in the manual pages provided with the package:
miredo(8) and miredo.conf(5)

# man 8 miredo
# man 5 miredo.conf


Securing you Miredo installation
=================================

  By default, Miredo drops its root privileges and runs as user nobody.
While that is far more secure than keeping root privileges as previous
versions did by default, it is not optimal. If you are security
concious, paranoid, or if you are building a package, you are advised
to perform the following steps to restrict the impact of a possible
compromise of the Miredo daemon.

  They are some steps to secure Miredo installation, because they are
non trivial and non portable, they cannot be done automatically. That
is why miredo defaults to using “nobody” user account which is
available on any POSIX-like operating system.

1) System user:
----------------
  Miredo should run with its own user account rather than common user
“nobody”. They are two ways to do that :

- You can enable the “--enable-miredo-user” command line option when
  running the source code configure script. If you are a packager,
  please use that method. Miredo will try to SetUID as “miredo” by
  default, though that can be overriden with the “-u” command line
  option (see man page miredo(8)).

- You can use the “-u” option when starting Miredo. That saves the
  cost of recompiling Miredo. For example:

  # /usr/local/sbin/miredo -u miredo

NOTE: If you are running Miredo as a Teredo client, Miredo will spawn a
separate privileged process whose only job will be the Teredo interface
parameters (it must be root to do that). If someone breaks Miredo, it
might still be able to break your IPv6 networking setup, but it should
not be able to compromise the whole system.

2) Chroot jail:
----------------
  Chroot jail can be enabled with the “-t” command line option. Note
that when using miredo as a Teredo client, you will typically have to
install your DNS resolver library and configuration within the chroot
environment, which is why the feature is currently disabled by default.
  On Linux/libc6, that would consist of copying /etc/resolv.conf,
/etc/nsswitch.conf and the Name Service Switch shared objects within
the chroot. You will also have to resynchronize /etc/resolv.conf within
the chroot with the one at the system root every time it is modified
(such as when the DHCP client updates /etc/resolv.conf).

  If you intend to use miredo only as a Teredo relay and/or server,
you should really enable the chroot, as it is safer and should work
fine “out of the box”.

3) POSIX capabilities:
-----------------------
  Miredo supports POSIX.1e capabilities (at least on Linux), if they
are available. You should not need to worry as it is entirely
automatic.

  If you are a packager, you should consider installing your system’s
POSIX capabilities library development files, before building Miredo.


Feedback:
==========

  If you have further questions, please write to:

    miredo (dash) devel (at) remlab (dot) net

-- 
Rémi Denis-Courmont <remi (at) remlab (dot) net>
http://www.remlab.net/miredo/