Provided by: anytun_0.3.6-1ubuntu1_amd64 
NAME
anytun - anycast tunneling daemon
SYNOPSIS
anytun
[ -h|--help ]
[ -D|--nodaemonize ]
[ -u|--username <username> ]
[ -g|--groupname <groupname> ]
[ -C|--chroot <path> ]
[ -P|--write-pid <filename> ]
[ -L|--log <target>:<level>[,<param1>[,<param2>[..]]] ]
[ -U|--debug ]
[ -i|--interface <ip-address> ]
[ -p|--port <port> ]
[ -r|--remote-host <hostname|ip> ]
[ -o|--remote-port <port> ]
[ -4|--ipv4-only ]
[ -6|--ipv6-only ]
[ -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>/<prefix> ]
[ -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> ]
[ -e|--role <role> ]
[ -E|--passphrase <pass phrase> ]
[ -K|--key <master key> ]
[ -A|--salt <master salt> ]
[ -c|--cipher <cipher type> ]
[ -a|--auth-algo <algo type> ]
[ -b|--auth-tag-length <length> ]
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 allows a 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 foreground instead of becoming a daemon which is the default.
-u, --username <username>
run as this user. If no group is specified (-g) the default group of the user is used. The default is
to not drop privileges.
-g, --groupname <groupname>
run as this group. If no username is specified (-u) this gets ignored. The default is to not drop
privileges.
-C, --chroot <path>
Instruct Anytun to run in a chroot jail. The default is to not run in chroot.
-P, --write-pid <filename>
Instruct Anytun to write it’s pid to this file. The default is to not create a pid file.
-L, --log <target>:<level>[,<param1>[,<param2>[..]]]
add log target to logging system. This can be invoked several times in order to log to different
targets at the same time. Every target hast its own log level which is a number between 0 and 5.
Where 0 means disabling log and 5 means debug messages are enabled.
The file target can be used more the once with different levels. If no target is provided at the
command line a single target with the config syslog:3,anytun,daemon is added.
The following targets are supported:
syslog
log to syslog daemon, parameters <level>[,<logname>[,<facility>]]
file
log to file, parameters <level>[,<path>]
stdout
log to standard output, parameters <level>
stderr
log to standard error, parameters <level>
-U, --debug
This option instructs Anytun to run in debug mode. It implicits -D (don’t daemonize) and adds a log
target with the configuration stdout:5 (logging with maximum level). In future releases there might
be additional output when this option is supplied.
-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>
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>
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>
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.
-4, --ipv4-only
Resolv to IPv4 addresses only. The default is to resolv both IPv4 and IPv6 addresses.
-6, --ipv6-only
Resolv to IPv6 addresses only. The default is to resolv both IPv4 and IPv6 addresses.
-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 separate 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 separate 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, tapN is used for Ethernet tunnel interfaces, and tunN 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>/<prefix>
The local IP address and prefix length. The remote tunnel endpoint has to use a different IP address
in the same subnet.
<local>
the local IP address for the tun/tap device
<prefix>
the prefix length of the network
-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.
-m, --mux <mux-id>
the multiplex id to use. default: 0
-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 can be ignored on unicast endpoints. 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.
-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
-e, --role <role>
SATP uses different session keys for inbound and outbound traffic. The role parameter is used to
determine which keys to use for outbound or inbound packets. On both sides of a vpn connection
different roles have to be used. Possible values are left and right. You may also use alice or server
as a replacement for left and bob or client as a replacement for right. By default left is used.
-E, --passphrase <passphrase>
This passphrase is used to generate the master key and master salt. For the master key the last n
bits of the SHA256 digest of the passphrase (where n is the length of the master key in bits) is
used. The master salt gets generated with the SHA1 digest. You may force a specific key and or salt
by using --key and --salt.
-K, --key <master key>
master key to use for key derivation
Master key in hexadecimal notation, e.g. 01a2b3c4d5e6f708a9b0cadbecfd0fa1, with a mandatory length of
32, 48 or 64 characters (128, 192 or 256 bits).
-A, --salt <master salt>
master salt to use for key derivation
Master salt in hexadecimal notation, e.g. 01a2b3c4d5e6f708a9b0cadbecfd, with a mandatory length of 28
characters (14 bytes).
-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.
If HMAC-SHA1 is used, the packet length is increased. The additional bytes contain the authentication
data. see --auth-tag-length for more info.
Possible values:
null
no message authentication
sha1
HMAC-SHA1, default value
-b, --auth-tag-length <length>
The number of bytes to use for the auth tag. This value defaults to 10 bytes unless the null auth
algo is used in which case it defaults to 0.
EXAMPLES
P2P Setup between two unicast enpoints:
Host A:
anytun -r hostb.example.com -t tun -n 192.168.123.1/30 -c aes-ctr-256 -k aes-ctr-256 \ -E
have_a_very_safe_and_productive_day -e left
Host B:
anytun -r hosta.example.com -t tun -n 192.168.123.2/30 -c aes-ctr-256 -k aes-ctr-256 \ -E
have_a_very_safe_and_productive_day -e right
One unicast and one anycast tunnel endpoint:
Unicast tunnel endpoint:
anytun -r anycast.anytun.org -d anytun0 -t tun -n 192.0.2.2/30 -a null -c null -w 0 -e client
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 192.0.2.1/30 -a null -c null -w 0 -e server \
-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 192.0.2.1/30 -a null -c null -w 0 -e server \
-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 192.0.2.1/30 -a null -c null -w 0 -e server \
-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
Othmar Gsenger <otti@anytun.org> Erwin Nindl <nine@anytun.org> Christian Pointner <equinox@anytun.org>
RESOURCES
Main web site: http://www.anytun.org/
COPYING
Copyright (C) 2007-2014 Markus Grüneis, 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 as published by the Free Software Foundation, either version 3 of the License, or any later
version.
07/08/2016 ANYTUN(8)