We have continual problems with losing network connectivity to the virtual machines hosted on a Hyper-V host (the host is running Hyper-V Server 2012 R2), it goes down 2 – 3 times per week.
Situation:
- All 3 Windows 2008 R2 virtual machines on the host lose connectivity to the outside world at the same random time (they are the only 3 on the host).
- When this occurs the host can still ping the 3 virtual machines and the host is reachable.
- When this occurs the 3 virtual machines can ping the host and each other, but nothing else outside of the host (request timed out followed by destination host unreachable)
- Nothing in the hardware or Windows event logs on the host indicates there is a problem. No indications of issues in the VM event logs either.
- Restarting the virtual machines does not fix the issue
- Brand new HP hardware, Broadcom nic drivers were upated early on
- VMQ is disabled on the VM's
- We are not using nic teaming or clustering
- Restarting the host temporarily resolves the problem (during the restart the vms are just placed in a saved state).
- The host is running Hyper-V Server 2012 R2
- The switch ports that the 2 network cables are plugged into (1 for RDP access to host and 1 for the VM traffic) show no errors on the switch.
- This sounds like an issue with the Virtual switch but I can't find anything in the logs that gives me a hint.