Router & Firewall setup for Remote Connection

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In this article we will continue to research the “Remote Desktop Connection” (see the page) but this time we will concentrate on the network settings and requirements in order to make it work.

The RDC application on the host is listening on port 3389 by default so we need to find a way to redirect, forward a request when it comes to our WAN to the right place in the our LAN. The easiest way is “DMZ” – (demilitarized zone) - . It is easy to create a DMZ as a way of being “lazy” and avoiding creating port forwarding rules, but remember that this can be very dangerous since that machine is no longer protected from potentially malicious connections.

Basic port forwarding as seen earlier does have some limitations. One is that you must forward to a specific machine, which makes it awkward to run a service using the same ports from more than one machine inside your LAN. Another is that the rule is always in effect (unless you manually disable it), meaning that port is left open even when the network application is not being used, which could be a security risk in some circumstances.

Above is a typical home or office network diagram, there is Ethernet/wireless router installed connecting to Internet.

You must assign static IP address to that computer with Remote Desktop feature enabled. After that log on to your router management page, look for the port forwarding or virtual server setting. If you are not sure where to look for, read the router manual.

Once you found it, key in the server listening port number (Remote Desktop port is TCP 3389) with protocol TCP and the IP address of Remote Desktop enabled computer.

Below is the port forwarding parameters I put on Linksys WRT54G wireless router, and after that I have no issue to make Remote Desktop connection to home network's public IP 178.63.23.34 remotely from my office. When the router receives the packets with destination port TCP-3389, it will forward those packets to computer with IP 192.168.1.99, which is my Remote Desktop enabled computer.

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