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


       guessnet-scan [options] [ethernet_interface]


       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 follow the usual GNU conventions,

              Print debugging messages.

       --help Show a brief summary of commandline options.

              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

       -v, --verbose
              Operate verbosely.

              Show the version number of the program.


       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.


       guessnet(8), interfaces(5).


       Guessnet-scan was written by Enrico Zini <>.

                                10 October 2004