Section: System Manager's Manual (5)
Updated: August 2007
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miredo.conf - configuration for Miredo
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
- RelayType (client|autoclient|relay|cone|restricted)
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
(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 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).
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
Otherwise the tunnel will NOT WORK PROPERLY.
Note that many NAT port forwarding implementations are broken.
- restricted mode
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
- ServerAddress hostname
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.
- ServerAddress2 hostname2
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 directive is only available in relay mode.
They are not available in (auto)client mode.
- Prefix teredo_prefix
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 client.
- InterfaceMTU mtu
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.
- InterfaceName ifname
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.
- BindAddress bind_address
Bind the Teredo relay or Teredo client to a specific IPv4 address.
By default, it is not bound to any particular IPv4 address.
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.
- BindPort udp_port
Define the UDP (IPv4) port number to be used by the relay or client.
By default, the operating system allocates an unused port
Use this option if you have firewalling constraints which can cause
Miredo to fail when not using a fixed predefined port.
- SyslogFacility facility
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)).
Rémi Denis-Courmont <remi at remlab dot net>
- CLIENT OPTIONS
- RELAY OPTIONS
- GENERAL OPTIONS
- SEE ALSO
This document was created by
using the manual pages.
Time: 08:28:22 GMT, April 11, 2009