@craigmod that was what I ended up doing when I was with NTT, sticking their aterm rando router in between my wifi and paying them ¥500/month for the privilege and triple NATing my ipv4 network so that I could use ipv6. I remember I did it because they had all this marketing material telling me that the ipv4 network is super congested. In hindsight I don't know if I believe it now.