How to find out which device is flooding local home network in a Mac?

Discussion in 'macOS' started by shankar2, Jul 23, 2016.

  1. shankar2 macrumors 6502

    Joined:
    Jun 7, 2009
    #1
    Hi, at home there are 2 android phones and rest are macs (phones and computers).

    I tested my broadband connection on speedtest.net and sometimes it shows good numbers 16mbps d/l and sometimes 4-5 mbps.

    I suspect some device is flooding my internet wifi network and I want to find out which IP address it has.

    Is there some LAN sniffer program for my el capitan mac that can show packets flooding the home network and find out its IP address?

    This is a mess and I need to fix it. I have little snitch working on my own mac and it not showing any abnormal activity.

    Thanks!
     
  2. shankar2 thread starter macrumors 6502

    Joined:
    Jun 7, 2009
    #2
    Update: i think it's my own mac so I shall use little snitch to test

    However if it's not my own mac is there any sniffer program for mac to examine the Home network?
     
  3. Superspeed500 macrumors regular

    Superspeed500

    Joined:
    Jul 25, 2013
    #3
    It might just be your DSL cable modem or router that have problems. Maybe tell us what router and provider you use? You might also want to check out wireshark. There are also some built-in UNIX commands in Mac that can help you check what services and ports that are in use on your Mac, but I don't remember any of them :0
     
  4. MC6800 macrumors 6502

    Joined:
    Jun 29, 2016
    #4
    The built-in Unix command to snoop the local net is tcpdump. Run Terminal and type:

    sudo tcpdump

    and enter your password. Stop it by typing a Control-C. Stretch the window wide for a clean view. There are a number of options which are described by the command "man tcpdump" followed by a spacebar per page.
     
  5. shankar2 thread starter macrumors 6502

    Joined:
    Jun 7, 2009
    #5
    So I enabled little snitch and found that just running my firefox browser opens 400 connections

    That's what little snitch network monitor is saying!

    So it's a mess how do i stop this firefox issue? Uninstalling firefox will do? Some anti virus or malware?

    Kindly assist
     
  6. Superspeed500 macrumors regular

    Superspeed500

    Joined:
    Jul 25, 2013
    #6
    How many addons do you have installed and what type of connections is there?
     
  7. shankar2 thread starter macrumors 6502

    Joined:
    Jun 7, 2009
    #7
    Yeah I reset my firefox settings to default and that means it deleted all the addons/extensions and now there is some sanity... the number of firefox connections have dropped down to about 70 from 430!

    Obviously there is some problem with my mac.... some kind of bot or something that's flooding my network. Any other suggestions? thanks
     
  8. CoastalOR macrumors 68000

    CoastalOR

    Joined:
    Jan 19, 2015
    Location:
    Oregon, USA
  9. shankar2 thread starter macrumors 6502

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    Jun 7, 2009
  10. shankar2 thread starter macrumors 6502

    Joined:
    Jun 7, 2009
    #10
    So after resetting firefox to default setting the connection requests are back so should I delete firefox completely and try?
     
  11. JohnDS macrumors 65816

    Joined:
    Oct 25, 2015
    #11
    Check for Firefox plug-ins as well as extensions.
     
  12. Tech198, Jul 25, 2016
    Last edited: Jul 25, 2016

    Tech198 macrumors G4

    Joined:
    Mar 21, 2011
    Location:
    Australia, Perth

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