Virtual Serevr R2 guest no network ?

I just installed VS2005R2 and installed q windows 2008 as guest OS.
configured the network connections - virtual networks etc and all seem fine.
the problem is that i cannot ping outside of the guest os, not event the GW
! whereas the GW is accessible from outside.
i have been told that the switch port is using protection mode ot accept
on,y 1 MAC add. so how do i get this towork ? here is what my hosting support
told me :

That is likely because we restrict each switch port to accept only one MAC
address.
Most modern OSes have the ability to disable arp flux when using a software
bridge. Please consult your favorite search engine for further information.

"Jean Maurice" <JeanMaurice@discussions.microsoft.com> wrote in message
news:B7752B25-07B4-424C-85BD-AB6384705EC7@microsoft.com...
> I just installed VS2005R2 and installed q windows 2008 as guest OS.
> configured the network connections - virtual networks etc and all seem
> fine.
> the problem is that i cannot ping outside of the guest os, not event the
> GW
> ! whereas the GW is accessible from outside.
> i have been told that the switch port is using protection mode ot accept
> on,y 1 MAC add. so how do i get this towork ? here is what my hosting
> support
> told me :
>
> That is likely because we restrict each switch port to accept only one MAC
> address.
> Most modern OSes have the ability to disable arp flux when using a
> software
> bridge. Please consult your favorite search engine for further
> information.
>

There is really no way around that. The bridge software (Virtual Machine
Network Services) allows the guest OS to share the physical NIC in the host
machine. If the switch port only allows one MAC address, you can only have
the host or the guest using the port, not both.

Can you install two NICs in the host and use two switch ports? You could
then configure the host and guest to use on NIC each.