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What is the significance of the DMZ LED bulb on the Linksys Wireless G Broadband Router?

Hi Everyone:

       Recently, I have purchased a Linksys Wireless-G Broadband Router and wish to learn as much as possible about it.  For instance, I noticed on the front panel one of the LED's labeled DMZ.  Could someone explain what DMZ is all about?  It is not lit on this wireless router.

        Any information regarding the LED light of DMZ on the Linksys Wireless-G Broadband Router.  I look forward to reviewing everyone's input.

         Thank you.

        George
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GMartin
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GMartin
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GCD1Commented:
I found this on DSL Reports.  I hope it helps you.

Quote:

I've seen several confusion and misunderstandings of what a DMZ is.

DMZ stands for DeMilitarized Zone and it can mean many things.
Most commonly it is a zone (computer or a network) that sits between a trusted zone (network - typically LAN) and untrusted zone (network - typically Internet). DMZ is typically separated by firewalls at each border. DMZ is typically used for servers (i.e. WEB or FTP) which are accessed from untrusted networks.

However in LinkSys terminology DMZ means something totally different - it means default forwarding.

A DMZ in LinkSys terminology is a host (computer) to which all ports are forwarded if DMZ turned on.
More appropriate term than DMZ would be Default Server (or something like that).

This DMZ does not introduce any additional security but it actually makes you more vulnerable (open) to the outside world.
(There are cases when you would use DMZ host but I leave that out of this topic for further discussions).

Speaking more specifically about DMZ implementation, if you have any port or range specific forwarding turned on on your router this takes preference and the rest of the ports is then forwarded to the DMZ host.

Whenever you can, use specific port forwarding, range forwarding or port triggering and try to avoid using of DMZ host unless you really understand what you're doing.
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GMartinAuthor Commented:
Hi

     Could you give me an example for the usufulness of port forwarding?

      Thank you

      George
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GCD1Commented:
Port forwarding is used when you have multiple computers connected by a router, but each computer uses a common port for a specific function.

Example:

If you have multiple computers connecting to the router, and you want to be able to connect to them via Remote Desktop Connection.  Remote Desktop operates on port 3389 on each computer, so what you have to do is setup port forwarding on the router to forward a unique port # to port # 3389 on each computer.  Let's say your router is IP of 192.168.1.1 and you have three computers with IPs of 192.168.1.2, 192.168.1.3, and 192.168.1.4.  If you want to be able to remote connect into each, you assign the computers a unique port # that will be forwarded from the router.  An example is this:

192.168.1.1 port 4025 is port forwarded to 192.168.1.2 port 3389
192.168.1.1 port 4050 is port forwarded to 192.168.1.3 port 3389
192.168.1.1 port 4075 is port forwarded to 192.168.1.4 port 3389

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GMartinAuthor Commented:
Hi There:

        Thank you so much for your clear definition and breakdown of DMZ.  Pesonally, I found this rather technical issue better to understand after reading your input on this topic.  

         Once again, many thanks to you for helping to make this clearer to me.

         George
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