A. Windows Server 2008 introduced jumbo frame support, but it wasn't available within Hyper-V VMs. Hyper-V 2008 R2 introduces jumbo frame support for VMs, but even with this version, the Legacy Network Adapter doesn't support Jumbo Frames.
Make sure jumbo frames are enabled on the network adapters on the Hyper-V host. Then, within the guest OS
- Open the Network and Sharing Center Control Panel applet.
- Click the Change adapter settings link.
- Right-click the network adapter and select Properties.
- Click the Configure button for the Virtual Machine Bus Network Adapter.
- Select the Advanced tab.
- Select 9014 Bytes for the Jumbo Packet value.
- Click OK.
- Q. How do I enable jumbo frames?
- Q. Should I disable NetBIOS over TCP/IP on my Windows Server 2008 R2 Cluster Shared Volume (CSV) cluster networks?
- New Features in Windows Server 2008 R2
- What You Need to Know About Hyper-V 2.0
Check out hundreds more useful Q&As like this in John Savill's FAQ for Windows. Also, watch instructional videos made by John at ITTV.net.