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stunc(1)			sofia-sip-utils			      stunc(1)

NAME
       stunc - .TH "stunc" 1 "Fri Mar 11 2011" "Version 1.12.11" "sofia-sip-
       utils"

NAME
       stunc - STUN test client

       Author:
	   Pekka Pessi <Pekka.Pessi@nokia.com>

	   Martti Mela <Martti.Mela@nokia.com>

	   Kai Vehmanen <Kai.Vehmanen@nokia.com>

       Date:
	   Created: Thu Jul 24 17:21:00 2003 ppessi

Synopsis
       stunc [OPTIONS] <stun-server-address>

Description
       The stunc utility can be used to gather information about possible NAT
       devices that are located between the client and STUN server.

       stunc can provide the following information: the IP address and port as
       seen by the STUN server, detecting presence of NATs, and hints on the
       type of address translation done. It should be noted that the results
       of NAT type and life-time detection should be considered as hints.
       There is no guarantee that NAT(s) will handle future packets in the
       same way.

Command Line Options
       The stunc utility accepts following command line options:

       -b  Perform a STUN binding discovery. stunc will report the client
	   transport address (IP:port) as seen by the STUN server. In the
	   presence of NATs, this address is allocated by the NAT closest to
	   the STUN server.

       -l  Perform a STUN binding life-time check.

       -n  Perform a STUN binding type check. Notice that the results are only
	   hints. Nondeterministic behaviour, resource exhaustion, or reboots
	   of network elements can cause changes in NAT behaviour between
	   successive runs of stunc.

       -r  Randomize the local port. Otherwise stunc let's the operating
	   system select a free port.

       -s  Request a shared-secret over TLS. Tests whether the STUN server
	   supports the shared-secret mechanism (needed to protect message
	   integrity). Can be combined with -b, -l and -n.

Return Codes
       0when successful 1when any errors detected

Examples
       Discover the NAT binding, use a random local port:

	$ stunc stunserver.org -b -r

Environment
       STUN_DEBUG

Reporting Bugs
       Report bugs to <sofia-sip-devel@lists.sourceforge.net>.

Authors
       · Pekka Pessi <pekka -dot pessi -at- nokia -dot- com>

       · Martti Mela <martti -dot mela -at- nokia -dot- com>

       · Kai Vehmanen <kai -dot vehmanen -at- nokia -dot- com>

Copyright
       Copyright (C) 2005,2006 Nokia Corporation.

       This program is free software; see the source for copying conditions.
       There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
       PARTICULAR PURPOSE.

Version 1.12.11			Fri Mar 11 2011			      stunc(1)

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