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Thread: strange network behavior whilst using nmap

  1. #1
    Join Date
    Jun 2013
    Beans
    5

    strange network behavior whilst using nmap

    i was scanning my external ip address with nmap and noticed during the scan the internet connectivity on my iphone which is on the network wireless really suffered, couldn't load a webpage.. but was connected to the internet.

    the connection to my other 2 devices which are hardwired to my router seemed to be unaffected.

    so the nmap scan itself appeared to be causing a dos on my wireless devices...

    is this usual, or not possible..

    scan settings were -
    Code:
    -sS -sU -T4 -A -v -PE -PP -PS80,443 -PA3389 -PU40125 -PY -g 53 –script

    i did get an error regarding syntax at beginning of the scan if i remember rightly, think it was the wrong type of ip address or perhaps mising a script..

    has anyone ever had this happen or aware of it?

    thanks..

  2. #2
    Join Date
    Oct 2009
    Location
    California
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    Hidden!
    Distro
    Ubuntu Studio 12.10 Quantal Quetzal

    Re: strange network behavior whilst using nmap

    It is possible that your router is dropping packets due to it's ram being filled.

    If the Nmap is running on wireless it is probably collisions in the wifi signal.
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  3. #3
    Join Date
    Jun 2013
    Beans
    5

    Re: strange network behavior whilst using nmap

    right, nmap wasn't wireless.. but i see what you mean.. my router was probably low on resources from running the scan as opposed to actually being scanned?

    this makes sense now... thanks duke.tim.

  4. #4
    Join Date
    Nov 2008
    Location
    Metro Boston
    Beans
    9,345
    Distro
    Kubuntu 14.04 Trusty Tahr

    Re: strange network behavior whilst using nmap

    Doing a "stealth" scan with -sS creates a huge amount of traffic. Nmap will try each port multiple times with a variety of source addresses. What happens if you simply run

    Code:
    sudo nmap -sT ip.of.your.router
    That runs a simple TCP scan of most commonly used ports.
    If you ask for help, please have the courtesy to check for responses and thank the people who helped you.

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  5. #5
    Join Date
    Jun 2013
    Beans
    5

    Re: strange network behavior whilst using nmap

    thanks..results are filtered, i tried several different scan types.. mainly just to play with nmap and test my security too..

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