path: root/src/man/anytun.8.txt

anytun(8)
=========

NAME
----
anytun - anycast tunneling daemon

SYNOPSIS
--------

*anytun*
[ *-h|--help* ]
[ *-D|--nodaemonize* ]
[ *-C|--chroot* ]
[ *-u|--username* <username> ]
[ *-H|--chroot-dir* <directory> ]
[ *-P|--write-pid* <filename> ]
[ *-i|--interface* <ip-address> ]
[ *-p|--port* <port> ]
[ *-r|--remote-host* <hostname|ip> ]
[ *-o|--remote-port* <port> ]
[ *-I|--sync-interface* <ip-address> ]
[ *-S|--sync-port* port> ]
[ *-M|--sync-hosts* <hostname|ip>[:<port>][,<hostname|ip>[:<port>][...]] ]
[ *-X|--control-host* <hostname|ip>[:<port>]
[ *-d|--dev* <name> ]
[ *-t|--type* <tun|tap> ]
[ *-n|--ifconfig* <local> <remote|netmask> ]
[ *-x|--post-up-script* <script> ]
[ *-R|--route* <net>/<prefix length> ]
[ *-m|--mux* <mux-id> ]
[ *-s|--sender-id* <sender id> ]
[ *-w|--window-size* <window size> ]
[ *-k|--kd-prf* <kd-prf type> ]
[ *-l|--ld-kdr* <ld-kdr> ]
[ *-c|--cipher* <cipher type> ]
[ *-a|--auth-algo* <algo type> ]
[ *-K|--key* <master key> ]
[ *-A|--salt* <master salt> ]

DESCRIPTION
-----------

*Anytun* is an implementation of the Secure Anycast Tunneling Protocol
(SATP). It provides a complete VPN solution similar to OpenVPN or
IPsec in tunnel mode. The main difference is that anycast enables the
setup of tunnels between an arbitrary combination of anycast, unicast
and multicast hosts.

OPTIONS
-------

*Anytun* has been designed as a peer to peer application, so there is
no difference between client and server. The following options can be
passed to the daemon:

-D|--nodaemonize
~~~~~~~~~~~~~~~~

This option instructs *anytun* to run in the foreground
instead of becoming a daemon which is the default.

-C|--chroot
~~~~~~~~~~~

Instruct *anytun* to run in a chroot chail and drop privileges. The 
default is not to run in chroot.

-u|--username <username>
~~~~~~~~~~~~~~~~~~~~~~~~

if chroot change to this user. default: nobody

-H|--chroot-dir <directory>
~~~~~~~~~~~~~~~~~~~~~~~~~~~

chroot to this directory. default: /var/run/anytun

-P|--write-pid <filename>
~~~~~~~~~~~~~~~~~~~~~~~~~

Instruct *anytun* to write it's pid to this file. The default is 
not to create a pid file.

-i|--interface <ip address>
~~~~~~~~~~~~~~~~~~~~~~~~~~~

This IP address is used as the sender address for outgoing
packets. In case of anycast tunnel endpoints, the anycast
IP has to be used. In case of unicast endpoints, the
address is usually derived correctly from the routing
table. The default is to not use a special inteface and just
bind on all interfaces.

-p|--port <port>
~~~~~~~~~~~~~~~~

local anycast(data) port to bind to

The local UDP port that is used to send and receive the
payload data. The two tunnel endpoints can use different
ports. If a tunnel endpoint consists of multiple anycast
hosts, all hosts have to use the same port. default: 4444

-r|--remote-host <hostname|ip>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

remote host

This option can be used to specify the remote tunnel
endpoint. In case of anycast tunnel endpoints, the
anycast IP address has to be used. If you do not specify
an address, it is automatically determined after receiving
the first data packet.

-o|--remote-port <port>
~~~~~~~~~~~~~~~~~~~~~~~
remote port

The UDP port used for payload data by the remote host
(specified with -p on the remote host). If you do not specify
a port, it is automatically determined after receiving
the first data packet.

-I|--sync-interface <ip-address>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

local unicast(sync) ip address to bind to

This option is only needed for tunnel endpoints consisting
of multiple anycast hosts. The unicast IP address of
the anycast host can be used here. This is needed for
communication with the other anycast hosts. The default is to 
not use a special inteface and just bind on all interfaces. However
this is only the case if synchronisation is active see *--sync-port*.

-S|--sync-port <port>
~~~~~~~~~~~~~~~~~~~~~

local unicast(sync) port to bind to

This option is only needed for tunnel endpoints
consisting of multiple anycast hosts. This port is used
by anycast hosts to synchronize information about tunnel
endpoints. No payload data is transmitted via this port.
By default the synchronisation is disabled an therefore the
port is kept empty.

It is possible to obtain a list of active connections
by telnetting into this port. This port is read-only
and unprotected by default. It is advised to protect
this port using firewall rules and, eventually, IPsec.

-M|--sync-hosts <hostname|ip>[:<port>],[<hostname|ip>[:<port>][...]]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

remote hosts to sync with

This option is only needed for tunnel endpoints consisting
of multiple anycast hosts. Here, one has to specify all
unicast IP addresses of all other anycast hosts that
comprise the anycast tunnel endpoint. By default synchronisation is
disabled and therefore this is empty. Mind that the port can be
omitted in which case port 2323 is used. If you want to specify an
ipv6 address and a port you have to use [ and ] to seperate the address
from the port, eg.: [::1]:1234. If you want to use the default port 
[ and ] can be omitted.

-X|--control-host <hostname|ip>[:<port>]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

fetch the config from this host. The default is not to use a control
host and therefore this is empty. Mind that the port can be omitted 
in which case port 2323 is used. If you want to specify an
ipv6 address and a port you have to use [ and ] to seperate the address
from the port, eg.: [::1]:1234. If you want to use the default port 
[ and ] can be omitted.

-d|--dev <name>
~~~~~~~~~~~~~~~
device name

By default, tap0 is used for Ethernet tunnel interfaces,
and tun0 for IP tunnels, respectively. This option can
be used to manually override these defaults.

-t|--type <tun|tap>
~~~~~~~~~~~~~~~~~~~

device type

Type of the tunnels to create. Use tap for Ethernet
tunnels, tun for IP tunnels.

-n|--ifconfig <local> <remote|netmask>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

*<local>* the local IP address for the tun/tap device

*<remote|netmask>* the remote IP address (tun) or netmask (tap)

In tap/Ethernet tunnel mode:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The local IP address and subnet mask of the tunnel
interface, in ifconfig style. The remote tunnel endpoint
has to use a different IP address in the same subnet.

In tun/IP tunnel mode:

The local IP address of the tunnel interface and the
IP address of the tunnel interface on the remote tunnel
endpoint.

-x|--post-up-script <script>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This option instructs *anytun* to run this script after the interface 
is created. By default no script will be executed.

-R|--route <net>/<prefix length>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

add a route to connection. This can be invoked several times.

-s|--sender-id  <sender id>
~~~~~~~~~~~~~~~~~~~~~~~~~~~

Each anycast tunnel endpoint needs a uniqe sender id
(1, 2, 3, ...). It is needed to distinguish the senders
in case of replay attacks. This option is ignored by
unicast endpoints. default: 0

-m|--mux <mux-id>
~~~~~~~~~~~~~~~~~

the multiplex id to use. default: 0

-w|--window-size <window size>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

seqence window size

Sometimes, packets arrive out of order on the receiver
side. This option defines the size of a list of received
packets' sequence numbers. If, according to this list,
a received packet has been previously received or has
been transmitted in the past, and is therefore not in
the list anymore, this is interpreted as a replay attack
and the packet is dropped. A value of 0 deactivates this
list and, as a consequence, the replay protection employed
by filtering packets according to their secuence number.
By default the sequence window is disabled and therefore a
window size of 0 is used.

-c|--cipher <cipher type>
~~~~~~~~~~~~~~~~~~~~~~~~~

payload encryption algorithm

Encryption algorithm used for encrypting the payload

Possible values:

* *null* - no encryption
* *aes-ctr* - AES in counter mode with 128 Bits, default value
* *aes-ctr-128* - AES in counter mode with 128 Bits
* *aes-ctr-192* - AES in counter mode with 192 Bits
* *aes-ctr-256* - AES in counter mode with 256 Bits

-a|--auth-algo <algo type>
~~~~~~~~~~~~~~~~~~~~~~~~~~

message authentication algorithm

This option sets the message authentication algorithm.

Possible values:

* *null* - no message authentication
* *sha1* - HMAC-SHA1, default value


If HMAC-SHA1 is used, the packet length is increased by
10 bytes. These 10 bytes contain the authentication data.

-k|--kd--prf <kd-prf type>
~~~~~~~~~~~~~~~~~~~~~~~~~~

key derivation pseudo random function.

The pseudo random function which is used for calculating the 
session keys and session salt.

Possible values:

* *null* - no random function, keys and salt are set to 0..00
* *aes-ctr* - AES in counter mode with 128 Bits, default value
* *aes-ctr-128* - AES in counter mode with 128 Bits
* *aes-ctr-192* - AES in counter mode with 192 Bits
* *aes-ctr-256* - AES in counter mode with 256 Bits

-l|--ld-kdr <ld-kdr>
~~~~~~~~~~~~~~~~~~~~

The log2 of the key derivation rate. This is used by the key
derivation to determine how ofen a new session key has to be
generated. A value of -1 means to generate only one key and use
it forever. The default is 0 which means to calculate a new key
for every packet. A value of 1 would tell the key derivation
to generate a new key after 2 packets, for 2 its 4 packets and 
so on.

-K|--key <master key>
~~~~~~~~~~~~~~~~~~~~~

master key to use for encryption

Master key in hexadecimal notation, eg
01a2b3c4d5e6f708a9b0cadbecfd0fa1, with a mandatory length
of 32 characters (16 bytes).

-A|--salt <master salt>
~~~~~~~~~~~~~~~~~~~~~~~

master salt to use for encryption

Master salt in hexadecimal notation, eg
01a2b3c4d5e6f708a9b0cadbecfd, with a mandatory length
of 28 characters (14 bytes).

EXAMPLES
--------

One unicast and one anycast tunnel endpoint:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
Unicast tunnel endpoint:
^^^^^^^^^^^^^^^^^^^^^^^^

anytun -r anycast.anytun.org -d anytun0 -t tun -n 192.0.2.2
192.0.2.1 -w 0 -c null

Anycast tunnel endpoints:
^^^^^^^^^^^^^^^^^^^^^^^^^

On the host with unicast hostname unicast1.anycast.anytun.org and anycast 
hostname anycast.anytun.org:
--------------------------------------------------------------------------------------
# anytun -i anycast.anytun.org -d anytun0 -t tun -n 192.0.2.1 192.0.2.2 -w 0 -S 2342 \
         -M unicast2.anycast.anytun.org:2342,unicast3.anycast.anytun.org:2342
--------------------------------------------------------------------------------------

On the host with unicast hostname unicast2.anycast.anytun.org and anycast
hostname anycast.anytun.org:
--------------------------------------------------------------------------------------
# anytun -i anycast.anytun.org -d anytun0 -t tun -n 192.0.2.1 192.0.2.2 -w 0 -S 2342 \
         -M unicast1.anycast.anytun.org:2342,unicast3.anycast.anytun.org:2342
--------------------------------------------------------------------------------------

On the host with unicast hostname unicast3.anycast.anytun.org and anycast
hostname anycast.anytun.org:
--------------------------------------------------------------------------------------
# anytun -i anycast.anytun.org -d anytun0 -t tun -n 192.0.2.1 192.0.2.2 -w 0 -S 2342 \
         -M unicast1.anycast.anytun.org:2342,unicast2.anycast.anytun.org:2342
--------------------------------------------------------------------------------------

For more sophisticated examples (like multiple unicast endpoints to one
anycast tunnel endpoint) please consult the man page of anytun-config(8).


BUGS
----
Most likely there are some bugs in *anytun*. If you find a bug, please let
the developers know at satp@anytun.org. Of course, patches are preferred.

SEE ALSO
--------
anytun-config(8), anytun-controld(8), anytun-showtables(8)

AUTHORS
-------
Design of SATP and wizards of this implementation:

Othmar Gsenger <otti@anytun.org>
Erwin Nindl <nine@anytun.org>
Christian Pointner <equinox@anytun.org>

Debian packaging:

Andreas Hirczy <ahi@itp.tu-graz.ac.at>

Manual page:

Alexander List <alex@debian.org>

RESOURCES
---------

Main web site: http://www.anytun.org/


COPYING
-------

Copyright \(C) 2007-2008 Othmar Gsenger, Erwin Nindl and Christian
Pointner. This  program  is  free software;  you  can redistribute
it and/or modify it under the terms of the GNU General Public License
version 2 as published by the Free Software Foundation.