On Sat, Oct 30, 2010 at 1:49 AM, Kurt Buff <[email protected]> wrote:
> I'm more than a little baffled by this one.

  It does sound weird.  Random thoughts follow, no particular order,
sleep-deprived brain, so use at your own risk.  :)

> However, when I ping the IP address that the machine refuses to use, I
> get no answer.

  Maybe try nmap with a full port scan, see if anything else comes back?

> When I use netmon on the VM in the AU office to capture ARP traffic, I
> get a MAC address that's for the DC.

  Do you see anything else for that IP address besides an ARP "is-at" message?

> I've even fired up regedit on the DC to search for the IP address, and
> all I'm showing is the one it's supposed to have - 192.168.61.31

  There are other ways to store IP addresses (e.g., binary data, or
outside the registry entirely), so that's not entirely conclusive.

  On the DC, check RRAS (Routing and Remote Access), see if .30 is
configured for dial-in or something like that.

  Check the following on the DC for clues:

getmac
ipconfig /all
netsh -c interface show interface
netsh -c interface show alias

  Can you temporarily shut down the misbehaving DC (or disable its
switch port) and see if the ARP still comes back?  Long shot, but
maybe something's spoofing it.

-- Ben

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

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