Is it possible to distribute an Internet proxy from one point to a local network?

Question

Computer networks

Good afternoon! The school installed a fiber-optic Internet with one point. I would like to distribute the Internet to the entire local network, but it does not work. I registered proxy parameters for each PC, put a certificate. Woz and now there.
Can you help? The school is rural, there are not very many opportunities to get to the city.
Thanks in advance.

Answer 1

and to specify a router as the gateway?

Answer 2

And it's like (I'm a teapot)?

Answer 3

What is "with one dot"? Here comes the optics, what's next?