I also confirm this issue. All IPv6 udp are blocked (guest vm by
Hyper-V)

using frederic-druilhet's comment 11
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1584042/comments/11

    ethtool --offload eth0 rx off tx off

the IPv6 udp works.

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https://bugs.launchpad.net/bugs/1584042

Title:
  Hyper-V NIC cannot pass IPv6 UDP packets by default until protocol
  offload is disabled

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