Hello Community,

Here is my situation : 

I have a problem regarding my TP link modem model: TL-MR6400 V4, i have a statique public ip assigned from my ISP and i want to promote my name server through it. now the SIM is inserted in the modem correctly and the IP address is also obtained successfully. but when i try to add virtual server to my internel server also no problem. it won't work.

I tried also configuring the DMZ to my internal server to DNAT all traffic not only port 53 but also no success.

here are some screenshots :

telnet from WAN to the public IP :

Also i tried DMZ config :

NOTES : 

I can ping the public ip from the wan when i activate remote ping in the modem. also when activate remote management over https when i tap : https://MYWANIP it takes my to the modem and not my web server.

I request any support.