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Host unavailable after Guest starts

Source: microsoft.public.virtualpc
Sent: 12/22/2005
From: "Bob" <(email address - cut out)>
Message:

Hi,

I have been asked to look into a strange problem.

I have a Windows 2003 Standard Edition physical server and I have loaded on
Virtual Server

I have built a guest also of Windows 2003.

Now, I can reboot the physical machine and I can ping its TCP/IP address and
get a response back
If I start the guest computer, I can ping the guest's TCP/IP address and get
a response back, but I can't do anything remotely to the host - everything
must be perfromed at the physical computer.

I suspect that this particular building uses "intelligent" ethernet switches
that register the MAC address attached at the other end of the cable. When
the physical host boots up, it registers its MAC address and the switch has
an entry for that in its internals, but when the guest OS boots and uses a
different MAC address (on the same cable) that the switch over-writes the
exisitng entry with a new MAC address. - Thus when I try to find the TCP/IP
address (either from ARP cache or by ARP broadcast) that the switch isunable
to locate and entry for the host MAC address because it has been
over-written by the guest MAC address.

Does this sound plausible? How can I prove (or disprove) this guess

TIA

Bob

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