Update: After hours of looking around I found "SPI firewall" in "Security" and "basic security" section, disabling it allowed me to lower the firewall and allow all packets on all ports toward all...

Thank you fo replying. Yes, the 192.168.1.0 is the WAN of the nano router. Can I somehow open all ports for all the devices on 192.168.3.0 without opening them one at a time?

Hello, installed the new travel router, set up router mode, set up static ip and found out that I can reach out the devices on the other subnet(192.168.1.0) with the devices connected on the wireless...