I've just read this: https://support.microsoft.com/en-hk/kb/2701206 , is
it possible that MS should do the fixing? not the side on Linux?
Besides, I install Ubuntu 16.04.1 on OpenVZ and VirtualBox, they are
working happily, only the guest VM in Hyper-V has this issue.
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Hyper-V NIC cannot pass IPv6 UDP packets by default until protocol
offload is disabled
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