Hyper-V, NIC Teaming and 2 hosts getting in the way of each other

Hey TechNet,
After my initial build of 2 Hyper-V Core server which took me a bit of time without a domain, I started building 2 more for another site. After the initial two, setting up the new ones went very fast until I ran into a very funny issue. And I am willing
to bet it is just my luck but I am wondering if any other out there ended up with it.
So, I build these 2 new servers, create a NIC teaming on each host, add the management OS adapter, give it an IP and I can ping the world. So I went back to my station and tried to start working on these hosts but I kept getting DCed especially from one
of them. Reinstalled it and remade the NIC teaming config, just in case. Same issue
So I started pinging both of the servers and I remarked that when one was pinging, the other one tended to not answer ping anymore and vice versa. After testing the firewall and the switch and even trying to put the 2 machines on different switches, did
not help. So I thought, what the heck, let's just remove all the network config from both machine, reboot, and redo the network config. Since then no issue.
I only forgot to do one thing before removing the network configuration, I forgot to check if the MAC address on the Management OS adapters were the same. Even if it is a small chance, it can still happen (1 in 256^4 i'd say).
So to get to my question, am I that unlucky or might it have been something else ?
Enjoy your weekends

I raised this bug long ago (one year ago in fact) and it still happens today.
If you create a virtual switch, then add a management vNIC to it - there are times when you will get two hosts with the same MAC on the vNIC that was added for management.
I have seen this in my lab (and I can reproduce it at will).
Modify the entire Hyper-V MAC address pool.  Or else you will have the same issue with VMs.  This is the only workaround.
But yes, it is a very confusing issue.
Brian Ehlert
http://ITProctology.blogspot.com
Learn. Apply. Repeat.

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