Question

5

How to tunnel traffic from one machine to another?

rated 0 times [ 5] [ 0] / answers: 1 / hits: 2306 / 2 Years ago, wed, july 13, 2022, 2:04:23

I have a server, which can be seen from outside of my small network, sever has domain name and such. And I have a local machine, which can be seen by server, but is not accessible from outside.

So I want to be able to connect to port on the sever, but talk to my local machine instead.

Can I make traffic arriving on one port on the server be relayed to another port on my local machine?

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

kroapathe

Add To Favorites

Follow

Total Points: 445

Total Questions: 117

Total Answers: 99

Location: Botswana

Member since Sun, Sep 19, 2021

3 Years ago

answered 2 Years ago ingsta · Accepted Answer

You can simply use openssh to do so: https://help.ubuntu.com/community/SSH/OpenSSH/PortForwarding

The commands to look for are -L or -R.

Let's say you want to forward port 4444 on the server to port 5555 on the local machine. On the Server use

ssh -L 4444:local_machine_name:5555 user@local_machine_name

or on the local machine use

ssh -R 4444:localhost:5555 user@server_machine_name

(In the first example you could connect to any other machine, no need to connect to local_machine_name, you could just use localhost to connect to the server itself).

Another more complex way is to use the server as a router. See https://help.ubuntu.com/community/Router and especially https://help.ubuntu.com/community/Router#Enable_IP_forwarding_and_Masquerading.
This is what most small cable or DSL home router do.