How I can manage router wifi

Hello, how I can manage a router lan; this is the example:

router lan 10.0.3.10 this ip came form the Nethserver, and the ip lan of the router is 192.168.0.120

How I can get in the other lan, thats call intervlan.

(I hope I understand correctly)
What do you want to manage/connect to the wifi router with?
If you use a Windows pc on the network card put a fixed free ip, out of DHCP, class 10.0.3.x then add an alias on the same network card 192.168.0.x.
You can also do this on linux.

I can help with this if you can give me just a little more info.