My router is AX1800, using official firmware.
It seems that UPnP support is removed and the latest miniupnp is not working behind NAT. Sadly my ISP provides only 100.64 IP instead of public accessible one.
Any idea to get the old version of miniupnp? Or other solution?
@luochongjun, I do not believe fullcone-nat works behind carrier-grade NAT (CGN).
Scegg, what are you trying to do?
Port forwarding cannot be done behind CGN, because the CGN already stops incoming packets. So even with port forwarding setup properly, no incoming packets will reach the AX1800, because CGN stops them before they reach the AX1800.
UPnP is simply a service allowing devices on the network to make/setup a port forward to them, so that will not work either! It might setup the port forward correctly, but like a already said: all packets will not get passed CGN.