Online PC remote control for On Demand Remote Support. March 11, 2010

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Remote Computer Support

- Port Forwarding & DMZ Basics

If you need help getting started using our online remote support software service or have questions, please email us at 4Support@4RemoteSupport.com.

 

On-Demand Remote Computer Control Online Through the Internet

 

To provide on-demand pc remote control on the web, you need to setup a simple port forwarding to, and for each of, the computer systems you'll be providing pc remote control remote support from using a unique port each. You don't need to change any equipment configurations on the remote computer side.

 

 

PC Remote Control Software

 

Basic Definitions & Explanations of networking ports in the context of connecting from the web for remote pc support..

 


YOU DON'T HAVE TO CONFIGURE ANYTHING ON THE REMOTE NETWORK'S EQUIPMENT. THIS APPLIES ONLY TO YOUR SIDE OF THE INTERNET CONNECTION FOR REMOTE PC CONTROL ON THE WEB.

 

Find the steps to configure port forwarding on your router or firewall at the following web site:

 

             http://www.portforward.com

 

They list hundreds of routers by manufacturer and provide configuration screen shots. If you need help please email us. We can try to help you only if we know you're having a problem.

 

Ports:

Applications running on TCP/IP open connections to other computers using something called ports. Ports allow multiple applications to reside on a single computer - all talking TCP/IP. Ports are another set of numbers AFTER the standard IP address. Applications often hide these port numbers to reduce the complexity of TCP/IP. Example: web services (HTTP) reside on port 80 by default. To reach this web site, you could type http://www.4remotesupport.com:80 into your browser. The number 80 is the default port number for the HTTP protocol so typing it is not necessary. There are 65535 available ports.

The settings you enter in your profile are stored in a database so they are "remembered" and then retrieved and used by the software that automatically downloads to the target remote desktop computer which you're trying to get remote control of to provide remote support over the Internet. You could change the port and IP address any time if your network changes. Times when your IP configuration may need changing is if you change your ISP, like going from cable to DSL or vise versa. Or you'd like to provide remote support from a different office or location. One of the great features of our system is that you aren't bound to a single IP address or network and thus you don't have to by multiple licenses or seats. You can provide remote desktop control on the web from almost any location with a single account.  

Port Forwarding:

A broadband router or other NAT application (like ICS) creates a firewall between your internal network and the internet. A firewall keeps unwanted traffic from the internet away from your LAN computers.  A ‘tunnel’ or "route" can be created through your firewall so that remote computers on the Internet can communicate to one of the computers on your LAN using a single port. This is handy for running web servers, game servers, ftp servers, video conferencing, and for online desktop remote support software. This is called port forwarding. One of your computers could run a web server (port 80) while another computer could run an FTP server (port 23) - both on the same IP address. For computer remote support purposes, the port forwarding is for your end-users' software to connect to your Viewer that's running on a computer connected to the LAN.

On your profile page, you input your Public or Internet IP address in the IP address field. The port forwarding to enable the online remote control software is only required to be done once and only on your side. TCP data passing through the port you selected and entered in the port field on your profile page is forwarded to your computer through the router. When supporting remote computer systems on the LAN, private WAN, or through a VPN, you use your computer's private LAN address and port forwarding isn't required.

 

                
 

DMZ:

This is a feature that is included on some routers but is not in Internet sharing software. A DMZ allows a single computer on your LAN to expose ALL of its ports to the Internet. Depending on firewall or router hardware, there could be many systems in a DMZ zone. When doing this, the exposed computer is no longer ‘behind’ the firewall.

Port Forwarding vs. DMZ
A DMZ is far easier to set up than port forwarding but exposes your entire computer to the Internet. Sometimes TCP/IP applications require very specialized IP configurations that are difficult to set up or are not supported by your router. In this case, placing your computer in the DMZ is the only way to get the application working. Placing a computer in the DMZ should be considered ‘temporary’ because your firewall is no longer able to provide any security to it.
The above is a version of a DMZ zone we call "the poor man's DMZ". This is where you place a data switch in between the gateway router and the firewall or router providing NAT for the LAN. Any systems on this small LAN network are assigned public IP addresses.  This is a high risk and not recommended for remote control over the web or any remote support software services. It was only mentioned for completeness. There are other more secure configuration depending on hardware.

Port forwarding can sometimes be difficult to configure, but provides a relatively safe way of running a server from behind a firewall. This is the method we recommend for our online remote support software service. Since only a single port (or small series of ports) is exposed to the Internet, the computer is easier to secure. Additionally, port forwarding allows you to run multiple kinds of servers from different computers on your LAN. (see above diagram)

Many broadband routers have special port forwarding configuration screens for standard applications (FTP, WWW, Mail, etc) and special screens for custom applications.

To learn more about setting up your account click here setting up your account for online remote PC control support  

                                                      Online pc remote control on the web

 
 

(This document is modified from the original located at http:/www.homenethelp.com/web/explain/port-forwarding-dmz.asp)