Port Tunnel Server
The Port Tunnel
allow you to create a virtual tunnel to a computer. You can use
this to map a server to multiple ports (for example you run an http
server on the standard port 80 and you want it to be available also
on port 8080). But the most common use is to tunnel through a local
Most local area
networks are organized like shown in the diagram below:
This is a very simple
diagram, but almost all LANs can be compared to it. You can have
more switches or even routers, but the main problem is that all
computers in the LAN can see each other and they can access the
Internet through a server (also called NAT or Network Address Translator).
The problem with this configuration is that a computer situated
on the Internet can not access a computer in the LAN unless the
LAN computer makes the "first contact".
take an example. Suppose that an user from outside the network (the
user with the laptop in the diagram) want to access his office computer
(Computer A). He can not do this, because Computer A is not visible
from the Internet.
By using the Port
Tunnel you can map a port on the server (port X) that will
point to Computer A (port Y). Now, the user with the Laptop can
connect to the server on port X and it will actually be connected
to the port Y on Computer A.
This can be a very useful
tool to provide remote access to a computer in a LAN, but you must
be very careful because if you can access your computer remotely
so can other people. In order to use a port tunneling technique
you must speak with your network administrator and he/she must create
a security policy with consideration to the port tunnel.
Why you should use port
- Provide access to the office computers for
employees working from home
- Use a special computer to run scripts for
- Use a special computer to hold a database
that is visible from the Internet
- Test a new server on another computer before
actually installing it on the real server.
I want to know how you
are using the port tunnel, so if you use it for something please
send me an e-mail
and tell me why you have decided to use it. If you have some special
ideas I will publish them on this site !