Hyper-V Networking

Posted on 2011-10-16
Medium Priority
Last Modified: 2012-05-12
I'm new to Hyper-V and testing some configurations in preparation to implementing it.  For my testing I'm running Hyper-V without Win2008 installed,  just the hypervisor.  For the test environment I only have 1 NIC.

I've got one virtual machine (W2k3) running with no issues.  When I add additional VMs, I cannot get network connectivity.  The VMs (W2k3, XP) have integration services installed and the Virtual Machine Bus Network Adapter shows up in each, but no connectivity.  

I'm assuming based upon my understanding I can have multiple virtual machines using the one NIC?  Any suggestings?
Question by:PasoRon
  • 2

Expert Comment

ID: 36978314
Try to:
1. Stop virual machine. (Changing properties will not work before VM restarts)
2. Go to VM properties
3. Check wich network is selected on Network Adapter item - my be there are "no network", may be VLAN selected but network swich not in trunk mode. Also select dynamic MAC.
4. Check Hyper-V server properties - Virual Neworks manager - is there enougth MAC-address range (more then one)?
5. Start VM again.

What you mean under "no connetivity"" Guest OS report "cable not plugged"?

Author Comment

ID: 36979846
Thanks for reply,
Network selected is same as network selected on the VM that works correctly,  VLAN is not selected, Dynamic MAC is selected.

MAC range is 00 - FF

Your question of why I say No Connectivity?  prompted me to recheck things.  I determined that if I assign a static IP to the VMs things seem to work.  At least to the extent I've determined so far.  

So the problem now is why would the VMs not reach the DHCP when I can reach that server after I give the network adapter a fixed IP.


Accepted Solution

morpheios earned 750 total points
ID: 36982734
Ok. I think some of this may help:
1. Update drivers on phisical NIC
2. Enable TCP Chimney Offload  http://support.microsoft.com/kb/951037

Also tell me what kind of network switch conected to Physical NIC - its maneged or unmanaged device? (May be some limitation on number of MAC on one port)

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