WAN Port not detected for Nanopi R5C

Hi, Just received my Nanopi R5C. Flashed the Debian 12 (Bookworm) Minimal/IOT images with Armbian Linux v6.12 from here https://www.armbian.com/nanopi-r5c/. Everything works well except that I could not get the WAN port working. Anyone has any idea? BTW, the Nanopi R5C looks different from the image showed on https://www.armbian.com/nanopi-r5c/. Mine has only 2 x 2.5Gb ports instead of the 3 port. The image on the page looks like a NanoPi R5S... Just a side note. Cheers.

I am not sure if this line in the yaml file makes sense: all-wan-interfaces: # include interfaces that are renamed to 'wanX' by udev, e.g. nanopi-r1 There is usually only 1 WAN interface on routers. The print on my R6C is "WAN" and "LAN1". WAN is clearly the Rockchip GMAC. Actually I use it as 'LAN', as the only RJ45 cable. Only temporary I also use the PCI-E / 2.5GbE port while bridging with the GMAC, so I have a real 2.5GbE port as peer for my ROCK5B (just for speedtests). For the R5C,