Model :

Hardware Version : Not Clear

Firmware Version :

ISP :

Sorry, my english isn't good.

I want to remotely access an application, I opened the necessary ports, but when i used public ip to connect, no response (no ping).
Within the status of the modem router is a WAN section which is the IP Address. But this ip (100.81.x.x) is completely different public IP (190.42.x.x).
I wish to help me with this issue because it is important, how should set up my modem router.
Significantly, the encapsulation of the connection to the ISP is PPPoE LLC and Get IP Addres is Dynamic.