use dynv6.com 's DDNS service, bind v6hub.passby.me to it.
(need change passby.me 's DNS record).
then write a bash, dynamically update the ip.
view my ipv6 address: http://ip6.me/ or test-ipv6.com ,
or your windows network property panel.
or by curl curl -s [<https://api.myip.la>](<https://api.myip.la>)