I have a Hyper-V server that randomly just drops off the internet in no specific pattern. It will go fine running five VMs that all have their own IPV4 in a /29 subnet.
The host machine is on a separate /30. Every few days at random times the host and all the virtual machines will lose network connectivity.
I have had the datacenter connect a KVM to the machine and I could not revive the networking without a reboot. This is very annoying and I don't know why it would be happening.
The server is a HP Proliant SE1101. The host OS is Windows Server 2008 R2.