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View open ports on network attached computers

Discussion in 'Networking (Hardware & Software)' started by Dennis L, 2005/11/14.

  1. 2005/11/14
    Dennis L Lifetime Subscription

    Dennis L Inactive Alumni Thread Starter

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    Have a number of programs which can monitor "active or open ports" on my computer. I would like to be able to view this same activity for computers (XP and w98SE) attached to my network. Network is connected through a router.
    Thank you
     
    Dennis L,
    #1
  2. 2005/11/14
    Newt

    Newt Inactive

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    Newt,
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  4. 2005/11/15
    TonyT

    TonyT SuperGeek Staff

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    TonyT,
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  5. 2005/11/15
    Dennis L Lifetime Subscription

    Dennis L Inactive Alumni Thread Starter

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    Thanks guys

    Installed LanLook, incredibly fast scanner, but appears to be limited to identifying attached IP devices in my Lan, and port scanning said IP's for "Active Services" available. Example on my XP ...

    PORT.....SERVICE...........DECRIPTION
    25.............smtp...............Simple Mail Transfer
    110...........pop-3..............PostOffice V.3
    135...........loc-srv.............NCS local location broker
    139...........netbios-ssn.......NETBIOS Session Service
    445...........microsoft-ds -.. (no decription provided)

    Does not appear to be a way to display any/all active ports at a given attached IP location. It was the first scanner that found my router and HP network printer (ethernet connection physically attached via router). It does provide a complete scanning of open/active ports connections for my HP network printer along with a boatload of additional connection information pertaining to the printer. An area in which XP provided sparse information.

    Languard
    Have not installed yet. I'm concerned about a prerequisite .... when scanning an attached network computer, its Firewall must be be disabled. My router should provide reasonable protection (NAT and SPI), I prefer not disabling / enabling software firewall when I want to scan.

    nMap
    I had run into this network scanner prior to posting. At times open source can be challenging just in understanding "what" is to be installed. With the above programs limitations, I chose (tried) to install the "zip" version.
    It is a 3-step process ....
    First install "WinPcap 3.1 (exe install)
    2nd install "nmap-3.93-win32.zip" and unpacked into a program folder.
    The above two steps have been done.
    3rd Step "Open a command prompt (DOS) window and cd into the new nmap-VERSION directory. Type "nmap -h" for usage information. "
    This step has me confused. Is this a ... run ~ cmd ~ (am I now in DOS ?)
    Then perform cd (which I think is a change directory? )... to where I located step 2 install? And last "Type "nmap -h" for usage information. ". This is to perform what?. Gotta love open source for vague.
     
    Last edited: 2005/11/15
    Dennis L,
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  6. 2005/11/15
    TonyT

    TonyT SuperGeek Staff

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    nmap is a commandline program, there's no graphical interface.
    Do this;
    1. rt click your desktop and select New > shortcut.
    2. in the dialog enter this as the Location:
    C:\WINDOWS\system32\cmd.exe /k "C:\Program Files\nMap\nmap.exe "
    3. click next button.
    4. enter nMap for name.
    5. double click the shortcut to launch a command window running nMap.
    note: I put the nmap files in my c:/program files/nMap directory and the command above reflects that. Change the path to nMap so it matches exactly where you put the files on your computer.

    If the nmap commands do not appear in the command window then type this:
    nmap --interactive and then type h and press the enter key.

    Each time you scan you must type this:
    nmap and the desired switches and the ip address.
     
    Last edited: 2005/11/15
    TonyT,
    #5
  7. 2005/11/15
    Dennis L Lifetime Subscription

    Dennis L Inactive Alumni Thread Starter

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    Thanks TonyT
    Thanks for the shortcut. I now have nMap view including all available switches.
    But can not seem to get any of the commands / switches to respond. My path was and is identical to yours. Tried a simply ping .. Always get error message(s)
    C:\WINDOWS>nmap -sP 192.168.0.3
    nmap is not recognized as an internal or external command, operable program or batch file.

    C:\WINDOWS>nmap -sP <192.168.0.3>
    The syntax of the command is incorrect.
     
    Dennis L,
    #6
  8. 2005/11/18
    bbbooolllooo

    bbbooolllooo Inactive

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  9. 2005/11/18
    Steve R Jones

    Steve R Jones SuperGeek Staff

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    CurrPorts allows you to view a list of ports that are currently in use, and the application that is using it. You can close a selected connection and also terminate the process using it, and export all or selected items to a HTML or text report. Additional information includes the local port name, local/remote IP address, highlighted status changes and more.

    http://www.snapfiles.com/get/cports.html
     
    Steve R Jones,
    #8
  10. 2005/11/18
    Dennis L Lifetime Subscription

    Dennis L Inactive Alumni Thread Starter

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    Thanks guys for the suggestions ...

    bbbooolllooo - Chose cmd line version - is current with development - GUI is a year behind. But may try GUI if I can't get cmd version to work.

    Steve R Jones - Have CurrPorts installed on both computers on my network. But does not offer option to remote monitor a computer on network.
     
    Dennis L,
    #9
  11. 2005/11/19
    TonyT

    TonyT SuperGeek Staff

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    afaik won't work on xp sp2 with newest version on nMap.
     
    Last edited: 2005/11/19
    TonyT,
    #10
  12. 2005/11/19
    TonyT

    TonyT SuperGeek Staff

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    I believe your path to nmap is misconfigured, it appears that you are trying to run it from any command prompt window, when you must have a command window in the nmap dire to use it.
    It should look like this:

    C:\Program Files\nMap>nmap -sP 192.168.1.100-110
    (will ping scan the addresses between 129.168.1.100 and 192.168.1.110)
     
    Last edited: 2005/11/19
    TonyT,
    #11

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