NAT Forwarding is not working among WAN
I am trying to SSH forward my Raspberry using the 4G-Router Archer MR600 but cannot connect over internet.
Virtual Server Forwarding is working fine when my laptop and Raspberry are both connected to the router, but if I try to connect from a different access point it says "Resource temporarily unavailable". I am absolutely sure my Forward settings are not wrong. Now I also tried using with and without DDNS, Firewall, and many other settings that could mess this up in my mind but nothing changed. Even worse: when I ping the WAN IP of the router it replies when connected to its Wi-Fi, and doesn't when from a different access point !
I am at this point where, after doing researches for over 6 hours, I cannot find solutions by myself...