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Tuesday, 16 April 2013

Nested ESXi Install & Second VMKernel Communication Issues

Attempting to build myself a small lab using a MAC Mini.  Bigger post to follow on that.

If your running nested ESXi, multiple interfaces and multiple VMKernel vNICS on the second hypervisor layer then do yourself a favour and enable Promiscuous mode on the vSwitch.

The upstream switch only ever learns the first VMKernel MAC (ESXi uses the actual physical interface MAC) and not the subsequent vNIC interfaces so L3 comms will never work to the vNIC, even between devices on the same subnet/vlan.

This probably demands a picture, which it's not going to get right now but this post is about the same problem.