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Manual Reference Pages  -  INADYN-MT (8)



inadyn-mt - a client for open DNS servers.




inadyn-mt [-h | --help] [-u | --username username] [-p | -- password password] [-a | --alias alias[,hash] [dual | coupled | ip4 | ip6 | auto]] [--input_file path/name] [--ip_server_name server[:port] url] [--dyndns_server_name server[:port]] [--dyndns_server_url url] [--dyndns_system service] [--proxy_server[:port] proxy[:port]] [--update_period ms] [--update_period_sec sec] [--forced_update_period sec] [--log_file path/name] [--background] [--verbose level] [--iterations iterations] [--syslog] [--change_persona uid[:gid]]


inadyn-mt is a client for ‘open’ name servers. That is, it allows the user’s machine to have an Internet recognized name by transferring some control over a name server not managed by the user. Some of the services that are offered by those open name servers are free of charge, and work even when the client machine does not have a static IP. Supports both IPv4, and IPv6 addresses.

Supported name servers are: (requires SSL bridge, like stunnel)

Its basic operation is to periodically check whether the actual IP of the client machine is the same one that is recorded in the name server, and update the name server records when there is a mismatch.

For IPv6 addresses, see below, alias, and ip_server_name options.

Also, network status can be checked at a user specified interval, and audible alerts issued in event of network status down.


"-h, --help"
  Print a summary of the options to inadyn-mt and exit.
"-u, --username"
  The username, if applicable. This might be referred to as hash.
"-p, --password"
  The password, if applicable.
"-a, --alias[,hash] [dual | coupled | ip4 | ip6 | auto]"
  A host name alias, optional comma delimited hash, and optional ip version, default auto. This option can appear multiple times, for each domain that has the same IP.

For alias ip type, it may often suffice to use either dual, for dual stack clients updating a given alias to both IPv4, and IPv6 addresses, or ip4 when the client is dual stack and requires at least one IPv4 only address update. Leaving ip type up to the ip server (see ip_server_name option, below) may be also, in many instances, sufficient (auto alias ip type, which is the default).

Use ip type coupled instead of dual in cases where ip server update specification requires dual stack updates in a single update request, i.e., both ip address types may be sent in a comma delimited list fashion.

  The file name that contains inadyn-mt command options exactly as specified in the command line syntax (adds to those already present in the cmd line). The default configuration file name is ’/etc/inadyn.conf’. It is looked at automatically if inadyn-mt is called without any command line options. The format is as expected for a **NIX config the hash character is used to comment entire lines. Spaces are ingored. The long options may be specified without -- if placed at the beginning of the line.
--ip_server_name[:port] url
  The client IP is detected by calling ’url’ from this ’ip_server_name:port’.

Choice of ip server name parameter option can determine what type of address is updated. To update an IPv6 address, simply choose an ip server that supports IPv6, such as, /, /, /, among others. And, of course, dynamic dns server should be set to one that supports IPv6.

  Host name used in http request to ip server if differnt from ip server name, as when, e.g., ip_server_name is ’localhost:port /’ through an SSL bridge. Defaults to ip server name.
  The server that receives the update DNS requests. When no proxy is specified it is sufficient to set the dyndns_system so that the default servers will be taken. The option is useful for generic DynDNS services that support HTTP update.
  The update path inside the DynDNS server.
  Host name used in http update DNS request, if different from dyndns server name, as when, e.g., ip_server_name is ’localhost:port’ through an SLL bridge. Defaults to dyndns server name.
  An optional DNS service. For

the acceptable services are one of, or

There is only one acceptable service for, which is
Other services are:
  Requires SSL bridge, like stunnel; set --server_host_name
  See also custom server options, --svr_rsp_succes, --svr_rsp_other, --svr_ip_param, --svr_ip_in_rsp
The default service is, which is believed to be used by most users, at least initially.

  An http proxy server name and port. The default is none.
  How often the IP is checked. This value denotes millisecond (There are 1000 milliseconds in one second). 30000..864000000. Default is about 10 min. maximum is 10 days.
  How often the IP is checked. Here the value denotes seconds. 30..864000. The default is about 10 min. The maximum value is 10 days.
  How often the IP should be updated even if it is not changed. The time should be given in seconds. 30 sec..30 days. Default, 30 days.
  Fine timer control. Slow, or speed timer between -4..5. Default, 0.
  The name, including the full path, of a log file.
  Directory to which ip, and time update files are written. Defaults to /tmp on **NIX systems.
  run in background. Output is sent to the UNIX syslog facilities or to a log file, if one was specified.
  Set the debug level, which is an integer between 0 to 5.
  Set the number of DNS updates. The default is 0, which means infinity.
  Explicitly sending the output to a syslog like file, such as /var/log/messages.
--change_persona uid[:gid]
  After init changes user ID and group ID to the provided ones. This allows dropping unneeded [root] privileges after startup.
  Network comm retry attempts. 0 to 100, default 0.
  Network comm miliseconds retry interval, 0 to 30,000, default 1,000.
  Retry ip update even after network comm retries exhausted, default on.
  Network comm seconds update retry interval, after retries exhausted. 5 to 3600, default 300.
  Language file path, and file name, defaults to either ../inadyn-mt/lang/en.lng, or etc/inadyn-mt/en.lng. No parameter option gives hard coded defaults.
  srv_name[:port] local_url - URL to reach to confirm online status.
  Seconds [30..864000] interval at which to check online status, defaults to 600.
  Network retries before audible network status alerts. [0..100], default 0.
  Seconds [0..864000] interval at which to check online status, after offline detected, defaults to 15.
  Audible network status alerts toggle (log output only), default off.
  Audible network status alerts wave file path, and file name. defaults to either ../inadyn-mt/extra/wav/alarm.wav, or etc/inadyn-mt/extra/wav/alarm.wav. [wave loops: 0..100; -1 for infinite] same as wave_loops below -- optional number of times per wave play call to repeat wave file play, default 0.
  Same as wave_file parameter optional parameter -- 0..100; -1 for infinite number of times per wave play call to play wave file.
  Wave file output buffer size control -- integer or float multiple of wave file bytes per sec. [.25..10], default .25.
  Gain (amplitude adjust) at which to play audible alert (beware clipping), integer or float. [-10..10], default 10 (0db, no attenuation).
  Time in miliseconds between consecutive audible network status alerts, [0..3600000], default 0.
  Optional for custom DDNS updates. A quoted comma delimited string, e.g., "good, nochg", representing custom DDNS server successful update return values.
  Optional for custom DDNS updates. A quoted comma delimited string, e.g., "dnserr,911", representing custom DDNS server non-fatal update failure return values.
  Optional for custom DDNS updates. DDNS url parameter for ip address, e.g., myip.
  Optional for custom DDNS updates. Flag that custom DDNS server returns your ip address on update success. Defaults to false.
  Additional servers file. Default search for servers_additional.cfg in ./extra, /etc, /etc/inadyn-mt, /etc/inadyn-mt/extra. Contains additional preconfigured DDNS servers to be used as --dyndns_system option parameter in same fashion as servers inadyn-mt supports natively. Should appear before any dyndns_system, option in inadyn-mt.conf or command line if not using inadyn-mt.conf.
--if Name of network interface to use for ip server, and DDNS server comm. Defaults to system configured default.
  ipv6 privacy extensions address preference. Valid parameters are ’pub,’ ’policy,’ ’home,’ ’careof,’ ’crypto,’ ’nocrypto,’ ’tmp,’ ’pubtmp.’ Defaults to ’pub.’ See rfc5014. Combining via logical OR not presently supported.


inadyn-mt -u username -p password -a
inadyn-mt --username test --password test --update_period 60000 --alias --alias my.second.domain
inadyn-mt --background -u test -p test --update_period 60000 --alias --alias my.second.domain --log_file inadyn-mt.log

inadyn-mt --dyndns_system -a,hash_from_freedns
inadyn-mt --update_period 60000 --alias,hash_for_host1 -a my.second.domain,hash2 --dyndns_system
The ’hash’ should be extracted from the grab url batch file that can be downloaded from the site. A single hashed (base64 encoded) string is preferred upon a username and password pair, apparently to reduce the computational resources that is required on their side. Unfortunately the hash can not be computed by inadyn-mt because it requires the index to the username record in the freedns database, which is not known. The simplest solution seems to be a copy&paste action from the grab url batch file offered on their website. When the batch file looks is like


the hash string, which is what the user should copy and paste, is the string that begins right after the ’?’ character and ends with the end of line. This string shell be used as the username in inadyn-mt command. When the user has several names then each name should be followed with that name hash string.


inadyn-mt prints a message when the IP is updated. When the connection goes down it could be that inadyn-mt will print some error messages. Those are harmless and should be followed by ’OK’ messages after the connection is back up.


Any of the SIG_HUP, SIG_INT, SIG_QUIT will cause inadyn-mt to terminate gracefully. SIG_USR1 will cause inadyn-mt to update ip, if changed.


    Other manual pages

The syntax of the optional configuration file is given by inadyn-mt.conf(5).

    Internet resources





inadyn was written by Narcis Ilisei, <>; inadyn-advanced, Steve Horbachuk; inadyn-mt unicode, other augmentations, Bryan Hoover <>

This manual page was written by Shaul Karl, <>, for the Debian GNU/Linux system, based on the readme.html file that is found in the source.

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Linux applications INADYN-MT (8) September, 2009

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