NAME
stunc - STUN test client. 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.