We upgraded our Hyper-V cluster from 2012 to 2016. (Hardware compatibility issues). Ever since we upgraded, every time a host is restarted, we get a weird DHCP request. We monitor our DHCP server filter, which is installed on a 2012 R2 OS, with SCOM to check if an unknown MAC address is attempting to request an IP. I ran Wireshark and I found the following:
After the server is drained, paused and restarted, a request is coming to the DHCP server with an unknown MAC address. the source of the request is from the host's physical MAC address which has a static IP address. The client IP address is the Host's IP. The client MAC address is a random address which is not a part of anything we setץ
I even tried installing SCVMM 2016 and had the same issues. The only thing that is weird is, when a VM is restarting I don't have this issue.
I have 2 clusters in 2 different locations with the same problem.