There are computers on a network with three subnets 192.168.0-2 with a mask of 255.255.255.0, how can I add a network with addresses like 10.0.0.0?

Question

System administration

There are computers in the local area in three subnets 192.168.0.x-192.168.2.x with a mask of 255.255.255.0, all see each other and exchange packets through a router with three interfaces, respectively. The entire network receives the Internet through a proxy server. They want to add add ip addresses with a class A network (I think I put it correctly), 10.0.0.0 for further expansion, it turns out the subnet mask will also be different. How to implement this, is it necessary to add a new interface to the router, and if so, how to associate old ip addresses with new ones so that a full packet exchange is performed between them?
upd: Nobody is going to get rid of old networks, everything will work as before, you just need to add a new network and so that everyone sees each other as before

Answer 1

On the router, add an interface with a new subnet
. For example, 10.0.0.1 mask 255.0.0.0
And configure routing for this subnet.
Computers on this subnet can have addresses from 10.0.0.1 to 10.255.255.255.254

Answer 2

Tannenbaum. "Computer networks." Read and understand.

Answer 3

Do you want to get rid of 192.x.x.x and put everyone in 10.0.0.0/8 ?
By the way, they will expand for you more and there will be enough in your spaces, you still have 253 subnets free

Answer 4

A router is needed, which will drive traffic between networks.