An issue that is bothering me.
The host is a Windows 2012 R2 server, the Hyper-V VM running on it is also Windows 2012 R2. The virtual switch is configured to be external network. The VM is able to network on the external network only for 3 minutes, after that it automatically becomes internal network effectively, as it can only communicate with the host. Now, if I go and do are reset by setting the virtual switch to become internal then set it back to external, the VM is able to communicate to external network, but only for 3 minutes, after that it again falls back to internal. I removed the virtual switch and re-create a new one, the symptom is the same - 3 minutes external, then become effectively internal.
There are 600 + computers on the network with similar configuration, this VM is the only one having this problem.
The MAC address is statically assigned, so far I have not seen any duplicate in MAC address on the network.
Any suggestion?
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