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Thread: Monitor LAN traffic - simple tool for home LAN

  1. #1
    Join Date
    Sep 2005
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    303

    Monitor LAN traffic - simple tool for home LAN

    I am having some dips in bandwith that cannot be explained by any activity I know about.

    I have looked at Nagios but it is more than I need. I don't need an elaborate UI and I don't want to have to install and configure apache.

    Hoping for a simple commandline tool.

    Anything?

  2. #2
    Join Date
    Jun 2019
    Beans
    20
    Distro
    Ubuntu

    Re: Monitor LAN traffic - simple tool for home LAN

    That's easy. bmon, nload, tcpdump

  3. #3
    Join Date
    Sep 2005
    Beans
    303

    Re: Monitor LAN traffic - simple tool for home LAN

    As far as I can tell these all monitor traffic on the machine that is running the application. I want to monitor traffic that is running through the *LAN* i.e. monitor traffic to all the devices connected to my router. My router doesn't offer much in the way of logging.

    At any time, I have a number of devices connected to my LAN and I want to know which device is the hog.

  4. #4
    Join Date
    Mar 2007
    Location
    Promiseland
    Beans
    877
    Distro
    Xubuntu 18.04 Bionic Beaver

    Re: Monitor LAN traffic - simple tool for home LAN

    holiday, here is crude, simple, effective method that only requires one additional network adapter for your PC (assuming wired LAN)
    Code:
        ISP
         |
         |
    Cable Modem
         |
         |  <--Cat5e cable
         |
      Your_PC
         |
         |
      Router
      |  |  |
      |  |  |
     Other_PCs
      on LAN
    Others may suggest a more elegant solution
    Cheers,
    I am not an expert on anything, but I pretend to be one at times.
    Software expands to consume available system resources.

  5. #5
    Join Date
    Jun 2019
    Beans
    20
    Distro
    Ubuntu

    Re: Monitor LAN traffic - simple tool for home LAN

    Quote Originally Posted by holiday View Post
    As far as I can tell these all monitor traffic on the machine that is running the application. I want to monitor traffic that is running through the *LAN* i.e. monitor traffic to all the devices connected to my router.
    Yes, my suggestions do exactly that. But you never mentioned otherwise in your original post. Perhaps you should implement a software based router into your network that would handle proper logging for all connections. That would be my suggestion as hardware modems/routers are terrible for logging traffic and troubleshooting.

  6. #6
    Join Date
    Sep 2005
    Beans
    303

    Re: Monitor LAN traffic - simple tool for home LAN

    Ah I see. Thank you both. A project that is a bit more interesting than I thought.

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