WIN2008R2: No external network access from Hyper-V guest using Virtual Machine Bus - Legacy ok

Windows Server 2008 R2 Enterprise x64 Hyper-V host
HP DL370 G6, HP NC375i integrated Quad Port Multifunction Gigabit Server Adapter
Static IP (.11), internet connection via a Cisco switch and PIX firewall
External virtual network connected to port 1, allowing management OS to share the network adapter
Windows Server 2008 R2 Enterprise x64 guest
Static IP (.21) on the same subnet, same subnet mask and default gateway (.1) as host
* with Virtual Machine Bus network adapter:
- host can ping guest (.21), switch (.5), and has internet access
- guest can ping host (.11), but cannot ping switch (.5) and has no internet access.
- network map shows the guest and host connected via a hub (Microsoft virtual switch), connected to a gateway, then a red X between gateway and internet
* with Legacy network adapter:
- host can ping guest (.21), switch (.5), and has internet access
- guest can ping host (.11), switch (.5) and has internet access.
- network map shows the guest and host connected via a hub (Microsoft virtual switch), connected to a gateway, and no red X between gateway and internet
I installed Hyper-V before adding the HP network drivers (there's a known problem if you install Hyper-V after adding the network drivers), so that's not it.
This happens both with straight network adapters, and also when two are configured as a network team - no difference.
I don't want to use the Legacy network adapter as the performance is terrible, but right now I have no choice as otherwise I can't get network or internet access from the guest.
Any ideas?

Hi,
Please refer to the following post to see whether you can resolve the issue.
Network Adapter (not Legacy) does not work on Virtual Machine after installation through ISO
http://social.technet.microsoft.com/Forums/en-US/windowsserver2008r2virtualization/thread/b1e9d24c-e298-472e-ad72-90cf079f6fbd
By the way, did you only encounter this issue with one VM or all VMs? Please do the same test on VMs with other version of Windows such as Windows Server 2008 or Windows Server 2003.
Best Regards,
Vincent Hu

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