How does port monitoring / mirroring work? This blog post has the purpose of explaining how to handle non trivial Hyper-V promiscuous mode requirements and introduces a simple PowerShell module to easily handle port monitoring settings on the host. PowerShell APIs, which do a great job in setting up port monitoring between VMs, are quite convoluted and obscure when it comes to host monitoring settings. Hyper-V 2012 introduced the concept of port monitoring (also called port mirroring) which can be enabled on any virtual machine network adapter or on the host. The interesting part is that there’s quite some official documentation available if you want to setup port monitoring / mirroring between two or more VMs, but you are almost on your own if you want to capture traffic coming from an external network or from the host root partition. A Hyper-V related question that shows regularly up in the forums is how to setup virtual switch ports in promiscuous mode so that external traffic can be received / monitored on the host’s root partition or on virtual machines.
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