Hi stebos,
I don't know how the user interface of the
Dynamic DNS configuration of your D-Link box looks like (I even don't use a D-Link router any more), but may be it is possible to leave the combo box for selecting one of the predefined DynDNS providers empty and configure a kind of
Update-URL in the
Server Address: field?
For example I'm using
FreeDNS as my DynDNS provider which is also not available among the predefined DynDNS providers within my router, and to make it work I have to use an Update-URL of the form
https://freedns.afraid.org/dynamic/update.php?{personal-ID}&address=<ipaddr>
where
{personal-ID} has to be replaced by an individual Identifier for my address registration which I can see in my account settings on FreeDNS' web site and where the placeholder term <ipaddr> is automatically replaced by my router by the current IPv4 address it has been assigned to its WAN interface via IPCP/PPPoE (of course the router model must support this automatism, don't know if DIR-868L does).
How the Update-URL has to look like with
No-IP look at you provider's web site, for example
here.