NAME

       guessnet-scan - guess network configuration data by looking at network traffic

SYNOPSIS

       guessnet-scan [options] [ethernet_interface]

DESCRIPTION

       Guessnet-scan  tries to deduce network configuration data by watching network traffic at a
       given Ethernet interface.

       After scanning network traffic for some time, guessnet-scan prints a configuration  string
       suitable for inclusion in /etc/network/interfaces.

       Note  that  guessnet-scan  uses heuristics and wild guesses and that the resulting data is
       not guaranteed to be accurate.  The program is intended to be  used  as  a  first  try  at
       getting network configuration data without bothering anyone.

OPTIONS

       Options follow the usual GNU conventions,

       --debug
              Print debugging messages.

       --help Show a brief summary of commandline options.

       --init-time=int
              Time  in  seconds  to  wait  for  the  interface to initialize when it is not found
              already up at program startup.  Default: 3 seconds.

       -t, --timeout=int
              Time in seconds to watch for network traffic.  Default: 5 seconds.

       -v, --verbose
              Operate verbosely.

       --version
              Show the version number of the program.

SCANNING REQUIREMENTS

       To correctly identify all data of the local network, guessnet-scan needs  to  see  traffic
       related to a host in the local network and to the local gateway, if any.

       To  be  able to identify the network gateway, guessnet-scan also needs to see some traffic
       directed to the external network: you can help the detection by generating  some  outbound
       IP  traffic  during  the scan, for example by browsing a web page (without proxy) or using
       telnet to open a connection to some remote host.

       Note that if you are connected to a switch, guessnet-scan won't probably be able to  work,
       since  the  switch  will  isolate  it from the network traffic that the other machines are
       generating.

SEE ALSO

       guessnet(8), interfaces(5).

AUTHOR

       Guessnet-scan was written by Enrico Zini <enrico@debian.org>.

                                         10 October 2004                         GUESSNET-SCAN(8)