Let's make Ubuntu see subnets?

Question

ubuntu

This is my first communication with Ubuntu, and with Unix in general.
There is an IP video surveillance system: 10 servers and ~ 600 cameras.
Everything works as usual, but the management decided to see the time display on the video file after exporting.
Decided to deploy Ubuntu built on NTP.
As a result, the following happened: all video servers located on the same subnet are ideally synchronized with Ubuntu. We started setting up the cameras. And then it turned out that other subnets are not visible.
Good people suggested that you just need to disable routing in Ubuntu, but Googl began to mislead me more and more.
So how do you get Ubuntu to talk to more subnets?

Answer 1

The switches were set up fine.
The solution turned out to be adding a route, only specifying the desired geteway.

Answer 2

ip addr add 192.168.0.1/24 dev eth0
ip addr add 192.168.1.1/24 dev eth0
ip
addr add 192.168.2.1/24 dev eth0
ip addr add 192.168.3.1/24 dev eth0
Well, this is if there is / 24 on the cameras.