Turns out you're right, thanks for the correction! It's been so incredibly long since I used XP that I forgot it does need to be installed. It was introduced as

Turns out you're right, thanks for the correction! It's been so incredibly long since I used XP that I forgot it does need to be installed. It was introduced as a default in Server 2008 & Vista per https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/configure-ipv6-in-windows https://learn.microsoft.com/en-us/troubleshoot/windows-serve...