How to make remote connection (ssh tunnel) with putty/ssh?

Question

I am trying to make a tunnel between a server and laptop with Putty. The problem is, since the laptop has no public IP address, I have to make a reverse connection. But I really don't know how to do that.

Let me demonstrate what I want:

SERVER(PORT:6000) ----------> LAPTOP(PORT:7000)

but since the laptop has no public IP address I have to make like

SERVER(PORT:6000) <---------- LAPTOP(PORT:7000)

Can you please tell me what should I write as source port, destination etc.

Solution

Depends on which setup you want:

SETUP 1) server is listening

                              ssh tunel             LAN destination   
SERVER (listen on port 6000) ==========> LAPTOP -----> ip:port

(LAN destination could also be localhost:port to connect laptop itself)

PUTTY SETUP: right click on putty window title, choose Change settings / Tunnels and fill in:

source port: 6000
destination: ip:port (or hostname:port)
select "Remote"

SSH: ssh -R 6000:hostname:port

SETUP 2) laptop is listening

                              ssh tunel              destination   
LAPTOP (listen on port 7000) ==========> SERVER -----> ip:port

again, the destination could be localhost:port to connect to server itself.

PUTTY setup:

source port: 7000
destination: ip:port (or hostname:port)
select "Local"

SSH: ssh -L 7000:hostname:port

In both cases, you can also specify (in putty by a checkbox) if the listening LAPTOP/SERVER also accepts connection from other hosts.