I have a old PLC. I can config the PLC's LAN IP(192.168.2.2) address manually but there is no Default Gateway setting. And I have IR302 with a public statip IP(166.123.4.9) address from SIM provider.

Since I can not config default gateway on PLC, I want to know how to config the IR302 so I can access PLC remotely via the public static IP