ICMPv6 is pretty crucial for IPv6 to work correctly. Unfortunately, to this day, Windows 10 still blocks those packets by default. Here’s how to let them through.
Open Start / Run, then run:
This opens the Microsoft Management Console with the Windows Defender Firewall with Advanced Security snap-in.
Here select Inbound Rules and click New Rule…. On the Rule Type page, select Custom.
Select All programs.
Change Protocol type to ICMPv6.
Leave the IP addresses as they are.
Leave action as it is, Allow the connection.
Select the profiles as desired, Domain and Private should be a sane choice for most.
Enter a name, such as the very creative ICMPv6.
That’s it, cheers 🙂