What package contains this tool?

I found this topic in wiki: http://wiki.mikrotik.com/wiki/Manual:Tools/Dynamic_DNS
Is this tool still alive?

ur firmware is Hilink or no-hilink?

I don't know what "hilink" is.

In hilink mode LTE modem working as virtual network card.
In no-hilink mode LTE modem working as a simple modem.

I think you need xDLS slam.
Something like Zyxel IES-612-51

Please, make it possible to set GRE tunnel Key (not IPSec key) according of RFC1701 (https://tools.ietf.org/html/rfc1701).