I’ve been doing some additional digging into jumbo frames and other networking configurations, and along the way I came across references to VMware’s Enhanced VMXNet network adapters. These were apparently introduced in VMware ESX 3.5 and are necessary in order for virtual machines to take advantage of features like TCP Segmentation Offload (TSO) or jumbo frames.
The funny thing is this: even though the Enhanced VMXNet adapters are supported on both 32-bit and 64-bit versions of Windows Server 2003 and a few different flavors of Linux, the only way to be able to specify that you want to use an Enhanced VMXNet driver is if the virtual machine is configured as 64-bit Windows Server 2003 Enterprise Edition. This is outlined in this VMware KB article describing to how enable enhanced VMXNet drivers in Windows Server 2003.
Please refer to the Full post for the full document.
Thanks to the Author.