Provided by: miredo_1.2.3-1ubuntu1_i386
miredo.conf - configuration for Miredo
miredo.conf is the configuration file for Miredo. Each configuration
directive consists of one directive name, possibly followed by one or
several spaces and a value for the directive. White spaces, empty
lines and lines starting with '#' are ignored.
Directives are case-insensitive. A comprehensive list of the supported
Specifies what type of Teredo relay/client Miredo will serve as.
There are three possible choices:
client mode (the default)
In client mode, Miredo acts as a Teredo client. Miredo will
first authenticate with a Teredo server (see ServerAddress), and
if successful, will setup a Teredo tunneling interface with a
public Teredo IPv6 address and a default IPv6 route. That
virtual networking interface can be used to reach the IPv6
Internet as well as Teredo clients.
The use of Miredo as a Teredo client allows nodes to get an IPv6
connectivity from behind a NAT router device, as it tunnels IPv6
packets over UDP/IPv4 with special support for NAT routers.
Routers of that kind usually only forward TCP, UDP, and some
ICMP, IPv4 packets (with some limitation).
NOTE: Use of Miredo as a Teredo client is possible even if the
system already has IPv6 connectivity through another way
(native, 6to4, TSP, etc). In that case, Miredo will only be used
to reach other Teredo clients, as its tunneling interface has a
default route with a higher metric (which is to say a lower
priority) than the other network interfaces.
autoclient is currently an alias for client mode.
cone mode (relay also works)
In cone mode, Miredo acts as a Teredo relay. It will assume that
it has public global IPv4 connectivity with no firewall. In
other words, the UDP port used by Miredo must receive
unsoliticited traffic from the IPv4 Internet (see also
BindPort). Miredo will create a virtual networking interface
with a route toward Teredo clients.
Teredo relays forward IPv6 packets between Teredo clients and
the IPv6 Internet. For that to work, Teredo relays MUST have a
working IPv6 connectivity through a way distinct from Teredo
tunneling (native, 6to4, ISATAP, etc).
Warning: This mode should only be used if the node has a public
IPv4 address, or if it is behind a full cone NAT-router with
proper port forwarding rules. Otherwise the tunnel will NOT
WORK PROPERLY. Note that many NAT port forwarding
implementations are broken.
This mode is identical to the cone mode documented above, with
the exception that direct Teredo bubbles will be sent.
Theoretically (see RFC4380) this permits operation of a Teredo
relay from behind a restricted-port NAT. In practice, this
makes NAT traversal extremely unreliable. This setting is
present for backward syntax compatibility of the miredo.conf
file. PLEASE DO NOT USE THIS MODE.
The following directives are only available in (auto)client mode.
The ServerAddress directive specifies the hostname or numerical
IPv4 address of the Teredo server to use. Teredo clients needs
a Teredo server to establish and maintain their IPv6 over
UDP/IPv4 tunnel across a NAT device.
This directive MUST be specified when Miredo is in client mode.
hostname must resolve to a valid IPv4 address. If it is not
present, and no server hostname is specified on the command line
when starting miredo either, the program will fail.
Miredo assumes that the secondary Teredo server address equals
the primary server address plus one. If that is not the case,
this directive must be used.
The following directives are only available in relay mode. They are
not available in (auto)client mode.
This directive specifies the Teredo prefix which the Teredo
relay and/or server will advertise. teredo_prefix must be a
valid IPv6 prefix.
The default value is 2001:0000::.
Do not use that directive if you don't know what you are doing,
as it is more than likely to break your Teredo connectivity.
That option must not be used when Miredo serves as a Teredo
This directive overrides the default MTU size of 1280 bytes for
the Teredo tunneling interface. It should not be used if the
default Teredo prefix is used.
Specify the name of the Teredo tunneling interface which Miredo
will create ("miredo" by default). On some systems, it is not
possible to redefine the tunnel name.
Bind the Teredo relay or Teredo client to a specific IPv4
address. By default, it is not bound to any particular IPv4
Use this option if you have trouble with the default value, such
as if you have a multi-homed host with equal-cost IPv4 routing,
or if you have specific firewalling constraints.
Define the UDP (IPv4) port number to be used by the relay or
client. By default, the operating system allocates an unused
Use this option if you have firewalling constraints which can
cause Miredo to fail when not using a fixed predefined port.
Specify which syslog's facility is to be used by Miredo for
logging. Possible values are: daemon (the default), local0, ...
local7, kern and user (see syslog(2)).
Remi Denis-Courmont <remi at remlab dot net>