@Clive_A and @dariana_dev thanks for your advice, that helps. I'll use the ER605 in one of these ways.

@Clive_A to clarify my goal: I have two local networks with the addresses 192.168.10.0/24 and 192.168.20.0/24 and want to connect both with the ER605. Any device in the 192.168.10.0 network should be...

I want to use the ER605 for internal purposes: it should connect two local and internal networks (192.168....) without limitation. The connection from the LAN network to the WAN network works well,...