How to send the Internet to a friend on the provider's local network?

Question

Network administration

Hello.
The bottom line is this - my neighbor and I have the same provider, when the tariff plan ends and access to the Internet is cut down, the neighbor's IP pings with a bang. Based on this, as I understand it, you can use the network in the house as a local one, because we paid for the connection - that means everything is legal, right?

100Mbit tariff costs 180 UAH/month, and 1Gbit - 350/month.
No matter how, free 400% are not lying on the road!

I can not figure out where to dig to implement this, if anyone fumbles - tell me.
We log in to the network using a login and password, and I imagine it somehow like this - I buy a gigabyte tariff plan, connect an additional device on linux to the lan port of the router, do "magic" on it that will shoot the Internet at a friend's IP on a non-standard port, and the friend's router, in turn, will be configured to accept this magical Internet. Here.
If you are a system administrator and your eyes are bleeding - sorry, I don't know how it works, I need your help

Answer 1

The easiest way: Install a proxy (Squin Hginx), set it up - and the neighbor specifies the IP address and port of this proxy in his browser.
Disadvantage: only works in the browser. Well, even in some programs that can through proxy. You can set up a proxy on the router. a little problematic.
If you are in the same segment with him, then the neighbor can indicate your computer / router as a gateway (that is, you, not a provider). And you start at yourself NAT.
If you are with him in different segments, then you need to configure VPN, and then NAT again.
If you are close to him, then you can simply throw a cable from your router to his apartment ("close" is just determined by the possibility of a direct connection). It's a very "clean" way.
There is some difficulty with "authorize by login and password" - it is not clear which device does this.
No "additional device on linux'e in the lan port of the router" is needed - everything can be done by the router. Fortunately, routers almost always have linux.
PS: The question is normal.

Answer 2

Traffic is not to blame

Answer 3

Try in the settings of the neighbor's router / PC, set the IP address of your router

Answer 4

if you and your neighbor are in the same ethernet segment, you can raise your IP network on this segment, and the neighbor will fumble the Internet from the provider network of the segment to yours
if the ethernet segments are different, then a VPN will help you

Answer 5

I did this via PPTP, home-work

Answer 6

Connect ONE Internet.
And then stretch the cable to a neighbor.
Skinte on the Internet.
Profit

Answer 7

If the neighbor is conditionally nearby, then connect his router to the usual port of your router and share the Internet. One cable from the provider. That would be completely fair.

Answer 8

openvpn server up