Naseer  Freshman Member

Hello Guys, thanks a lot for your answers and supports. I contacted the ISP, and they told me that their SIM card is just for Hostspot like iPad, and Tablets. This means, the problem is not with routers, but with ISP. I close this issue here. Thanks a lot. Best regards, Naseer

Guys, i really appreciate your supports. Here is my topology. As I mentioned, once i could ping my DDNS (ping xxxx.synology.me) Address from the world (from my office), after that i could not anymore. But the DDNS Add has always the current public IP (google: what is my ip? = DDNS's public IP). I used the older versions of…

Thanks, but where could be the possible problem here? my Synology Router or ISP? i know, it is not the right question, perhaps based on experience could be an answer. but once with current Zyxel router setup i could ping my DDNS address from external network.

Hi Greg, thanks for your reply, i can't understand you well, could you please write more preciser? thank you so much.

Thanks for your reply. here are the screenshots: The NAT device is the Router Synology RT6600AX, the WAN port is auto IP Assign. Thanks once again.