Hi

My ISP has recently switched me to an ipV6 address and my synology device is no longer updating my ip address. Synology say that and issue with my DDNS provider!

I am using the add custom ddns provider option and this query string

Service Provider: Dynu.com
Query URL: http://api.dynu.com/nic/update?hostname=__HOSTNAME__&username=__USERNAME__&myip=__MYIP__&password=__PASSWORD__

Is there anything special I have to do to enable ipv6??

You can try the following URL for IPv6:

http://api.dynu.com/nic/update?hostname=__HOSTNAME__&username=__USERNAME__&myipv6=__MYIPV6__&password=__PASSWORD__

Please keep us posted on how it works for you.