Slow file browsing in MED-V / XP Mode with NAT and DFS

Note, for the purposes of this question, this issue is with the Windows Virtual PC / XP Mode integration portion of MED-V so is not MED-V specific.
We are in the process of deploying hundreds of MED-V instances to Windows 7 PCs to support legacy applications until they are replaced with versions that are compatible with Windows 7. Due to security concerns and our network infrastructure configuration,
we are required to use "Shared Networking (NAT)" mode for the Windows XP virtual machines. Our network drives are mapped to DFS shares. Depending on the site and drive mappings of a user, when opening or saving a file in an application,
it can take several minutes to browse to the target directory, even if it's not on a DFS share. Occasionally, it takes so long that the RemoteApp window hangs and disappears, even though the application is still running in the Windows XP VM.
Running network traces in the VM, I can see that Windows XP tries to "ping" all of the DFS targets whenever the network drives are enumerated, such as when clicking on My Computer. It waits for responses, then eventually times out.
From what I understand, this is the way that Windows XP determines which DFS target link is the fastest. Unfortunately, since vpc.exe does not run with admin rights in Windows 7, ICMP (ping sends ICMP ECHO REQUESTS) is blocked by the NAT
between the VM and the Windows 7 host. (This is why you cannot ping other PCs on the network from within the Windows XP VM when using NAT.) Therefore, the long wait times happen while XP waits for the replies that never come.
To verify that this is indeed the problem, I started vpc.exe with admin rights, then started the MED-V Workspace. I could ping other computers now from within XP and browsing took seconds instead of minutes. However, our users will not have admin
rights in Windows 7 so this is not an option for them. I also tested in bridged mode instead of Shared Networking mode with the same positive results. However, this is also not an option in our environment.
Any solutions or recommendations will be greatly appreciated.
Thank you in advance,
Victor S.
Victor S. - Sogeti USA

Hi,
I would do some research on this issue.
And I would update as soon as possible.
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