Hi, all. After I upgraded the system and rebooted, the secondary ethernet port(i.e. the LAN port) is gone.   The system info: https://paste.armbian.com/ekotoqigos   nanopi-r4s:~:% ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever pre