TSO (TSO MSS: 65535) is enabled at VMKernel by default, while it must be enable at VM level, which requires enhanced vmxnet virtual network adapter.
Windows 2k3, RHEL4/64, and SuSE 10 are the entry OS for TSO
For VMs without enhanced vmxnet, its virutal network adapter need to be replaced to support TSO. (Writting down the old MAC address is a good practice before removing the old virtual NIC).
TSO at VMkernel NIC could not be re-enabled, it has be re-created.
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