LAN division

Question

Computer networks

Good afternoon dear gurus.
The situation is as follows:
1. There is an Internet that goes to our office (OF) via a radio channel from someone else's apartment (HF).
2. The cord is plugged into the router, which is in HF, from the router via LAN, the Internet goes to the transmitter, from the transmitter to the receiver in our office.
3. OF + KV uses the Internet
As I understand it, KV has the ability to intercept our packets.
Now the question is: how can we protect ourselves, in the simplest possible way?
And one more thing - we need a static IP only for our "subnet".
Thank you.

Answer 1

vpn per server outside sq. On the same digitalocean.com At your end, you need a piece of iron that can hold this vpn. Mikrotik or something like that. The price of the issue is about 3000 for your router and 300 monthly for the server to which your traffic will go.

Answer 2

IPSEC to help you
Details here...

Answer 3

Install another router with NAT at your end - cut off HF from your intranet traffic. And the external one - no matter how you twist it, will go through the HF. If you want privacy, use encryption.