Edit /etc.defaults/ddns_provider.conf
and append the following at the end:
[dynv6 (IPv4)]
modulepath=DynDNS
queryurl=https://ipv4.dynv6.com/api/update?hostname=__HOSTNAME__&ipv4=__MYIP__&token=__PASSWORD__
website=https://dynv6.com/hosts
NOTE: This will be overwritten when DSM is updated, so it needs to be added again.
Once this is added, use Control Panel -> External Access -> DDNS to add a new
service provider of type dynv6 (IPv4)
, where the 'Password/Key' is the token
for dynv6 API access.