On Wed, Jan 14, 2009 at 9:42 AM, Roger Wright <[email protected]> wrote:
> How best to troubleshoot this?

  Use a packet sniffer.  Wireshark is free, and I believe Microsoft's
own Network Monitor still is, too.  See what packets are getting to
the DHCP servers, and back.

  If you have managed switches, you should be able to mirror the
port(s) your DHCP server(s) are plugged into to the sniffer computer.
If you can't do that, temporarily plug the DHCP server(s) into an
intermediate repeater, with the sniffer also plugged into the same
repeater.

-- Ben

~ Finally, powerful endpoint security that ISN'T a resource hog! ~
~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/>  ~

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