Attention: The Establishment of the DDNS updater directly at the NAS will only be necessary, if it is not possible to deposit data in the router. Currently the DDNS Service of QNAP only works with IPv4.
If you want to reach the services of your QNAP with a DS-Lite connection, go on reading here:
Systemadministration -> Network settings -> TCP-IP
fill in the DNS-Server
Change to the tab DDNS.
Activate the option
[x] Dynamic DNS service
User name: HOST-ID (Is shown to you when name is created.)
Password: (Is shown to you when name is created.)
Host name: YOUR-NAME.feste-ip.net
Please, attend to register a port forwarding in the router to be able to use the services of your QNAP device.