Hello All,
I have a server 2012 R2 with Hyper-V installed. Within Hyper-v, I have 3 guest machines: Guest1, Guest2, and Guest3.
I also have 4 physical Network Interfaces on the server. One set with 10.10.10.10/24 IP and the other setup with 10.10.10.254/24 IP.
I have created two virtual switches, each labeled switch1 (10.10.10.10/24) and switch2 (10.10.10.254/24) and both created within hyper-v virutal switches as External switches.
Initially all 3 guest machines were attached to Switch1. Everything was running fine for 4 months and all of a sudden, all 3 machines (using static IPs) stopped communicating with the network. All network communication was lost including internet.
I did everything and could not get these servers to communicate. I could however set each as dhcp and then they would acquire new ip and would work, but the static ip would not work.
Since these are production servers and DNS was pointing to those static IPs, i had to use those IP addresses. After much playing around, i disabled one of the virtual switches and attached all 3 guest machines to the other virtual switch and they started working.
This morning, all three guest machines stopped communication again and i had to remove the virtual switch and attach them back to the original virtual switch and everything started working again.
I'm afraid this will continue.
What is going on and how i prevent this from happening?