scanning

Discussion in 'Computer Security' started by bruce, Feb 11, 2005.

  1. bruce

    bruce Guest

    **If I port scan a LAN box with IP 192.168.1.3 from itself I get

    Scan of 1 IP started at Fri Feb 11 20:34:44 2005

    -------------------------------------------------------------------------------
    192.168.1.3
    Responded in 0 ms.
    0 hops away
    Responds with ICMP unreachable: Yes
    TCP ports: 135 139 445
    UDP ports: 123 137 138 445 500 1028 1900

    -------------------------------------------------------------------------------

    Scan finished at Fri Feb 11 20:34:53 2005

    **If I scan that IP from another machine on the LAN (192.168.1.2) I
    get

    Scan of 1 IP started at Fri Feb 11 20:36:10 2005

    -------------------------------------------------------------------------------
    192.168.1.3
    Responded in 0 ms.
    0 hops away
    Responds with ICMP unreachable: No
    TCP ports: 139 445
    UDP ports:

    -------------------------------------------------------------------------------

    Scan finished at Fri Feb 11 20:36:35 2005

    *****

    Nowhere in the doc for my modem router can I find anything on
    restricting ports for LAN addresses.

    My modem router is a netcomm nb1300+4

    and I am using scanline to run the scans

    How do I control which ports are accessable between PCs on the LAN?

    Can anybody shed any light on this for me?

    Thanks

    Bruce
     
    bruce, Feb 11, 2005
    #1
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  2. bruce

    phoenix Guest

    On Fri, 11 Feb 2005 20:41:47 +0800, bruce wrote:

    > snip
    > How do I control which ports are accessable between PCs on the LAN?
    >

    Install a firewall on each PC.

    Regards

    Bill
     
    phoenix, Feb 11, 2005
    #2
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  3. bruce

    IPGrunt Guest

    On 11 Feb 2005, bruce <> postulated in
    news::

    > **If I port scan a LAN box with IP 192.168.1.3 from itself I get
    >
    > Scan of 1 IP started at Fri Feb 11 20:34:44 2005
    >
    > -------------------------------------------------------------------

    ------------
    > 192.168.1.3
    > Responded in 0 ms.
    > 0 hops away
    > Responds with ICMP unreachable: Yes
    > TCP ports: 135 139 445
    > UDP ports: 123 137 138 445 500 1028 1900
    >
    > -------------------------------------------------------------------

    ------------
    >
    > Scan finished at Fri Feb 11 20:34:53 2005
    >
    > **If I scan that IP from another machine on the LAN (192.168.1.2) I
    > get
    >
    > Scan of 1 IP started at Fri Feb 11 20:36:10 2005
    >
    > -------------------------------------------------------------------

    ------------
    > 192.168.1.3
    > Responded in 0 ms.
    > 0 hops away
    > Responds with ICMP unreachable: No
    > TCP ports: 139 445
    > UDP ports:
    >
    > -------------------------------------------------------------------

    ------------
    >
    > Scan finished at Fri Feb 11 20:36:35 2005
    >
    > *****
    >
    > Nowhere in the doc for my modem router can I find anything on
    > restricting ports for LAN addresses.
    >
    > My modem router is a netcomm nb1300+4
    >
    > and I am using scanline to run the scans
    >
    > How do I control which ports are accessable between PCs on the LAN?
    >
    > Can anybody shed any light on this for me?
    >
    > Thanks
    >
    > Bruce


    Bruce,

    There is no firewall in this box, but it does NAT. This means that
    devices on the internet cannot directly address your LAN devices, as
    they exist on non-routable IP addresses.

    There is some risk involved with this setup from connections you
    initiate from the LAN, however, you are relatively safe from random
    probes to your workstations.

    You can either buy a real firewall device that will explicitly block
    ports, or you can install so-called personal firewall programmes
    (like Zone-Alarm), that will provide this stateful packet inspection
    task for you.

    -- ipgrunt
     
    IPGrunt, Feb 12, 2005
    #3
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