It seems like miniupnpd is getting confused in case of Multiwan scenario.
Specifically there's an issue where the GUI adds "WAN" by default to the /etc/upnp/config and specifically the ext_ifname=xxx
Now, say WAN2 is the primary interface upnp will simply not work because the vlan of WAN is used in the config instead.
apparently you can add multiple outside interfaces so perhaps the code can be modified to check how many WANs are enabled and add the correspondent ext_ifname= for...
FT 2020.2 - miniupnpd issue - guest VLAN/WLAN only
Specifically there's an issue where the GUI adds "WAN" by default to the /etc/upnp/config and specifically the ext_ifname=xxx
Now, say WAN2 is the primary interface upnp will simply not work because the vlan of WAN is used in the config instead.
apparently you can add multiple outside interfaces so perhaps the code can be modified to check how many WANs are enabled and add the correspondent ext_ifname= for...
FT 2020.2 - miniupnpd issue - guest VLAN/WLAN only