[jedberg]

Anecdotal, but IPv6 saved me a lot of headache recently.

I got a warning about an unauthorized attempted login to my gmail account. They gave me the IP of the offending login. I was able to track that IP not only back to my house, but to a specific device in my house.

It was my NAS, and it was trying to log into gmail to send me an email about a failing drive. Gmail no longer allows username/password logins from third party apps, so I got a warning instead.

Without IPv6, I would have just chalked it up to a misbehaving device and ignored it since it came from my own IP, but because of IPv6, I was able to see it was from the NAS and investigate further.