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  • Broadcast listener

    Hi

    How can I listen / view all broadcasting in my lan?
    Do you know a utility for that? (google found only 1 obsolete program which didn't work 'DHCP Broadcast listener 1.0')

    thanks

  • #2
    Re: Broadcast listener

    http://www.ethereal.com/ is a very strong packet analizer.

    you can filter things that you dont need to see... very good for lan trouble shooting
    MCSE 2000 Done
    RHCE Done

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    • #3
      Re: Broadcast listener

      Thanks.
      Do you have any idea what should I filter in order to see broadcasts only?

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      • #4
        Re: Broadcast listener

        I haven't Ethereal on this machine, but anything with a destination of 255.255.255.255 (or all FF's) is what you would be looking for.

        theterranaut

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        • #5
          Re: Broadcast listener

          You should be able to run Ethereal for a while then stop capturing. Next, sort it by destination IP address.

          Broadcasts will look like either 255.255.255.255 (all hosts on all networks) or directed broadcasts like 192.168.1.255 (all hosts on the 192.168.1.x network).

          By sorting them, they will be all together and you can then look at the source IP's.

          Let us know if you have any trouble.

          Thanks,
          David
          David Davis - Petri Forums Moderator & Video Training Author
          Train Signal - The Global Leader in IT Video Training
          TrainSignalTraining.com - Free IT Training Products
          Personal Websites: HappyRouter.com & VMwareVideos.com

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          • #6
            Re: Broadcast listener

            Should we note that the broadcast address will be different than 255 if you have a netmask of /25 or higher (i.e. 255.255.255.128 or higher)?

            e.g. 1
            Network address = 192.168.1.0
            Netmask = 255.255.255.128
            Broadcast address = 192.168.1.127

            e.g. 2
            Network address = 192.168.1.0
            Netmask = 255.255.255.192
            Broadcast address = 192.168.1.63
            Regards,
            Jeremy

            Network Consultant/Engineer
            Baltimore - Washington area and beyond
            www.gma-cpa.com

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            • #7
              Re: Broadcast listener

              Jeremy, David-

              of course, quite correct.

              Apologies for any confusion caused, I was thinking of a (very) broad example.

              theterranaut

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