Re: rogue IP address

From: Duston Sickler (dustons_at_abswebb.net)
Date: 05/02/03

  • Next message: Bob Kelley: "Free Active Directory Tool" 
    To: <security-basics@securityfocus.com>
Date: Fri, 2 May 2003 12:13:01 -0500

    Did LANguard give you a MAC address of the offending NIC? If so you can
    look for the station that way if you have documented them. You could also
    send an Administrative email out to all users specifying how to locate the
    MAC address on the OS they run and have them email you back. When you find
    the MAC you have your user.

    Good luck,

    Duston Sickler
    "There are 10 types of people in the world, those who understand binary and
    those who don't".
    ----- Original Message -----
    From: "Dave" <david.morris@curvalue.nl>
    To: <security-basics@securityfocus.com>
    Sent: Friday, May 02, 2003 2:48 AM
    Subject: Re: rogue IP address

    Hi,
        I do not know your switch, or your network layout, but generic method
    which works in most cases is to set up a fast/"large data size" ping to said
    IP address.

    Look for the fastest blinking light.

    I know it is not scientific, and probably offends some people but it does
    work. (For up to a few hundred ports).

    - Assumes flat network.
    - Better to do it at a 'quiet' time, the effect is more noticeable
    - Assumes that you are aware of your important ports (servers/routers etc.)
    which normally have high load anyway.
    - Do NOT do it if network performance is critical, you can overload the best
    of switches with ICMP.
    - Maybe there are a few ports which look like possibilities, but at least
    you
    have narrowed them down.

    /Dave

    On Thursday 01 May 2003 00:40, dondon@pacbell.net wrote:
    > Someone on our network assigned an IP address to their own system without
    > my knowledge. Using LANguard network scanner, the best I can tell is that
    > it's a Linux box. The port-to-IP mapping table on our Asante switch
    > doesn't see to work correctly.
    >
    > Any suggestions on tracing down that system that is associated with the IP
    > is appreciated!
    >
    > Andy
    >
    > --------------------------------------------------------------------------
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    >-

    ---------------------------------------------------------------------------
    FastTrain has your solution for a great CISSP Boot Camp. The industry's most
    recognized corporate security certification track, provides a comprehensive
    prospectus based upon the core principle concepts of security. This ALL
    INCLUSIVE curriculum utilizes lectures, case studies and true hands-on
    utilization
    of pertinent security tools. For a limited time you can enter for a chance
    to win one of the latest technological innovations, the SEGWAY HT.
    Log onto http://www.securityfocus.com/FastTrain-security-basics
    ----------------------------------------------------------------------------

    ---------------------------------------------------------------------------
    FastTrain has your solution for a great CISSP Boot Camp. The industry's most
    recognized corporate security certification track, provides a comprehensive
    prospectus based upon the core principle concepts of security. This ALL INCLUSIVE curriculum utilizes lectures, case studies and true hands-on utilization
    of pertinent security tools. For a limited time you can enter for a chance
    to win one of the latest technological innovations, the SEGWAY HT.
    Log onto http://www.securityfocus.com/FastTrain-security-basics
    ----------------------------------------------------------------------------

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