Windows 7 Guest Network dies

I have a Windows 7 guest that was created on a KVM machine and imported to RHEV using virt-v2v.

On the KVM, the Win7 guest worked fine. After importing to RHEV, I can tranfer just a small amount of data (about 4K) and the network just shuts down.

I ran into this issue using a Cisco Blade system and using VM-FEX, and the problem turned out to be with Generic Receive Offload. Shutting gro off on the blade interfaces made the system work. Turning gro off on this server's interfaces did do anything.

I have tried both the RH virt io drivers as well as the realtek drivers. It doesn't seem to make a difference.

I have two interfaces, one connected to a rhevm, the other connected to a private vlan. It does not seem to make a difference which interface is used or if one or the other is disabled on the guest.

Is there anything specific I can look at to find out why my network does not work?

Thanx for any help you can give.

Frank