My added counter script of update DYNV6 below: The files download when update DYNV6, they named same, the file name will be 'update?hostname=&token=1a2b3c4d5e6f'. But I've no idea how to get the date and calculate. So I'm thinking, there is a flie download when update my DYNV6 domain, what about get date of this file, and calculate it, that will know how many days since last update. But I think if my router shutdown, like power failure, the counter will be lost, and if my router still get a same IPv6 address as same as last time, that will cause my domain not get update in a long time, maybe a other 19 days. my script run each 5 minutes, check and update my domain when the IPv6 address change before, so I add a counter in script, to force update my domain in each 10 days. that cause my router didn't update DDNS by script in nearly 19 days, and DYNV6 paused DNS resolution of my domain. But last morning, I found that IPv6 address was over 19 days not change, my ISP should change it each 3 days. so when I need link devices in my room, I configured a openvpn over a DYNV6 domain, to IPv6 address of my router. Hello, this is my first topic in this forum, and my mother tongue isn't English, may be I'm looks like not polite enough，trust me, I'm not mean it.

Update routeros mikrotik