We have had issues where upgrading VMtools causes the existing NIC to be replaced by another NIC and all settings are lost. We are running ESXi 5.5 U3b and upgrading tools from various versions to version 10. We need to understand the circumstances under which this can happen and also how to prevent it, if possible. We are using VMXNET3 NICs.
I have researched online and reviewed release notes, but cannot find anything which clarifies the expected behavior.