VMXNET3 (VMXNET Generation 3) is a virtual network adapter designed to deliver high performance in virtual machines (VMs) running on the VMware vSphere platform.
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VMXNET3 has the same features as the VMXNET2 adapter but with added functionality to minimize I/O virtualization overhead. To enable VMXNET3, VMs need to be on virtual hardware version 7 or later and may need VMware Tools installed, depending on which guest operating system (guest OS) is being used.