VirtualBox flubs IPv6 (when in doubt, go wired)

I’ve just spent an hour struggling with (I thought) IPv6 on Windows 7. IPv6 is enabled by default on Windows 7. I was seeing autoconfigured addresses on the ethernet interface, but there was no IPv6 connectivity beyond that. Looking at it with Wireshark, I could see neighbor discovery packets leaving, but answer came there none. No firewall rules were blocking ICMPv6; in desperation I turned the firewalls OFF on both source and destination test machines – still nothing. What the…?

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