RE: Blocking Access to Non-domain computers

From: Dan and Liz Boyson (dobandewb_at_juno.com)
Date: 08/29/04

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    To: "'Steven A. Fletcher'" <sfletcher@integrityts.com>, "'Andreas'" <andreas@inferno.nadir.org>, <security-basics@securityfocus.com>
Date: Sat, 28 Aug 2004 16:39:50 -0700

    Another way to approach this might be to let them have an ip address, but
    then deny them the use of a different IP service (maybe DNS?) so though they
    had an ip address, it was essentially useless.

    Daniel Boyson

    -----Original Message-----
    From: Steven A. Fletcher [mailto:sfletcher@integrityts.com]
    Sent: Tuesday, August 24, 2004 9:54 PM
    To: Andreas; security-basics@securityfocus.com
    Subject: RE: Blocking Access to Non-domain computers

    That is the only option I can think of. If you think about it, how could
    you keep non-domain computers from getting an IP address? As far as I know,
    there is no provision in DHCP for such control. For the system to determine
    whether or not to give the machine an address, the machine would need to be
    able to communicate with the domain controllers, which would require an IP
    address for the communication to be able to happen.

    Steve Fletcher
    Senior Network Engineer, MCSE (NT4/Win2k), HP Master ASE, CCNA,
    Security+
    Integrity Technology Solutions
    Phone: (309)664-8129
    Toll Free: (888) 764-8100 ext. 129
    Fax: (309) 662-6421
    sfletcher@integrityts.com
     

    -----Original Message-----
    From: Andreas [mailto:andreas@inferno.nadir.org]
    Sent: Monday, August 23, 2004 2:16 PM
    To: security-basics@securityfocus.com
    Subject: Re: Blocking Access to Non-domain computers

    Hello,

    On Thursday 19 August 2004 16:58, Brian Gehrke wrote:
    > I am running a W2K domain, using DHCP. Is it possible to block
    > non-domain computers from getting an IP address from the DHCP server,
    so
    > they will not be able to access the Internet through the network.

    is dhcp by mac address (which of course can easily be spoofed)
    an option?

    regards,
    andreas

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