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Phantom MS Virtual Bus Network Adapter

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Last Modified: 2013-11-06
Having a problem with a network adapter in a virtual server on a Windows Server 2008 Hyper-V host.   The virtual server is also running Windows Server 2008.

Some how I have ended up with a network adapter named 'Microsoft Virtual Machine Bus Network Adapter #5'.   No idea what happened to 1 thru 4!

When I try to assign a static IP to #5, I receive an error that states that the IP I am assigning to this adaptor is also assigned to an adaptor named 'Microsoft Virtual Machine Bus Network Adapter #4' and askes if I would like to remove the configuration from the absent adaptor.

I answer yes and apply the settings to #5.  Once I close out of network properties for #5, I recieve an error that Windows has detected an IP conflict.  I then do an 'ipconfig' and find that a default ip (169.254.2.XXX) is assigned to adapter #5 in place of the IP I want.

No other hosts on the network are using the IP that I am trying to assign to #5, so I have to conclude that #4 is the problem.  However, I cannot find any reference to #4 anywhere. I have checked device manager (showing hidden devices) and the registry.

I have shutdown the VM, delete and readded the network adaptor and still the problem persists.  Just to get the server back on the network, I have assigned #5 an address other than the one causing the error.  However I need this server to have the IP I was trying to config.  So, I need the server to have 192.168.1.6 and have temporarily assigned 192.168.1.20.

Another bit of behaviour that is related.  Each night at 3AM, the DNS is updated and changes the IP entry of this host from 192.168.1.20 to 192.168.1.6. So each day I must manually correct the IP in DNS in order for clients to connect.

Pleas, any advice or help will be greatly appreciated

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