NavigateWorx NR500 - Setting as local Router

Go to Link Management > Ethernet > Port Assignement

Change the Interface of Port Eth1 from LAN0 to LAN1

Port Eth1 is now running on LAN1

Go to Link Management > Ethernet > LAN

Add/change the LAN1 settings, setup the subnet of your choice

Now the Ports Eth0 and Eth1 are running in two different subnets,
using the management IP of both sides as Gateway make
the two subnets routing together feasible