I do see sockets listening on all interfaces, but those are blocked by the firewall.

  root@OpenWrt2:~# ss -Qlnt4 'src 0.0.0.0'
  State  Local Address:Port Peer Address:Port
  LISTEN       0.0.0.0:443       0.0.0.0:*   
  LISTEN       0.0.0.0:80        0.0.0.0:*   
  LISTEN       0.0.0.0:22        0.0.0.0:*