Use both Nas network connections with 2 different lans

[ed]

Yep, you're on the right track. Setting up different IPs on each port is a good way to connect to two separate LANs. Just make sure the IPs are on different subnets, like you did with 192.168.1.5 and 192.168.0.5. As for the default gateway, you generally leave it blank when you're dealing with a local network without internet access. If your second LAN has its own router, that's where you'd put the gateway.

Remember, these two LANs will be like separate islands unless you have a router connecting them. If you want them to play nice and talk to each other, you'll need a router to bridge the gap.