I need to access my home http service from internets, but I only have LTE ISP which gives me dynamic internal IP that is different from dynamic public IP. So, straight forward port forwarding is not working.
I do have VPS on DigitalOcean running Ubuntu. At home I have Mikrotik SXT LTE modem and RB2011 router. I set up PPTP on Ubuntu and can PPTP on my router - it works fine. Service is running on local device at 192.168.1.46.
How can I port forward Ubuntu to it's PPTP client which is my router and then to network device?