Modem 192.168.0.1
Router 192.168.1.1
Synology NAS 192.168.1.143 (TCP port 5000/5001)
When entering 192.168.1.143 in my browser at home-network I am able to access my NAS without any problems but I also want to access it from outside. I would need a DDNS Service for that but I am not even able to access my router / NAS from another device.
Ping and open ports are different things. Install tcpdump on the OpenWrt and run this command to verify that you indeed pass the packets properly to the NAS. tcpdump -i any -vn tcp port 5000 or tcp port 5001