Use software LRO in the VMkernel backend of VMXNET3 adapters to improve networking performance of virtual machines if the host physical adapters do not support hardware LRO.

vSphere supports software LRO for both IPv4 and IPv6 packets.



  1. In the vSphere Client, navigate to the host.
  2. On the Configure tab, expand System.
  3. Click Advanced System Settings.
  4. Edit the value of the Net.Vmxnet3SwLRO parameter for VMXNET3 adapters.
    • To activate software LRO, set Net.Vmxnet3SwLRO to 1.
    • To deactivate software LRO, set Net.Vmxnet3SwLRO to 0.
  5. Click OK to apply the changes.