IChat and DMZ

Greetings.
After months of not being able to chat with my wife and children through iChat, I have found a partial solution that I would like to share with you. At the same time I would like to ask for your help, in hope that the problem can be solved completely.
My problem (and every other iChat user's - apparently) was that when I called anyone at home (using iChat) from outside, I was getting an "user did not respond" message.
I read much about this problem on this forum and elsewhere in the Internet, but none of the solutions proposed worked (to make things worse, I have a very limited knowledge of what I was doing: - port forwarding???).
But recently I came across a couple of postings that seemed to point in the direction of something called DMZ. Happily, after playing with this setting for a while, I am now able to iChat with my wife consistently.
What did I do? Originally I had set DMZ (enabled) with the LAN address of the router 10.0.1.1. Instead, I configured DMZ with the address of my wife's computer. And it worked!
This is my setup:
1 ADSL Router (Zoom Zoom X5v 5565 - NAT enabled, DHCP enabled, DMZ enabled, no ports forwarded)
1 Airport Extreme Base (NAT disabled, no ports forwarded)
1 iBook, 2 iMacs (IP address set manually, all running OS X 10.4.6, connected through Airport)
My question: Putting my wife's LAN address on the DMZ configuration means that her computer is the only one I can iChat to. Obviously I world like to be able to talk to the other computers too!
I have tried to use the Router IP address and the Airport Base address instead, to no avail. I have also tried to disable DMZ, again with no success.
Any ideas?
Kind regards from Spain.
Mac OS X (10.4.6) iChat and Airport

Hi Manuel,
Welcome to the Apple Discussions.
Ok the way you have your devices set up yuo have DMZ from the modem to one computer on the LAN through the Airport which is not doing NAT or DHCP.
With some changes you can have the modem not doing DHCP and the Airport asking for a Static IP from the modem. The Airport can then do DHCP and NAT to the computers beyond this.
Even better will be if your mdoem is logging on to the ISP with PPPoE as you can ask the Airport to do this then there is no problems with NAT.
DMZ is an extreme form of Port Forwarding and uses NAT.
The things to avoid is two lots of DHCP and two lots on NAT.
This Page at PortForward.com is not the exact modle you have but should give you some idea of the set up pages of the modem.
I can not see that this device in the pics has UPnP and it difinitely does not have Port Triggering that would ideally allow connection to mulitple computers. It might be that your device does have UPnP, being a different model or possibly different firmware from the link I gave.
DMZ doe in fact open all ports and protocols to one computer.
Port Forwarding the correct ports to the same IP would limit the ports that are open.
The ports shown on the Port Forward site are in fact wrong at the moment.
You should use the ones listed here http://www.ralphjohnsuk.dsl.pipex.com/page4.html You do not have to set them in the Mac firewall but the same 29 ports needs to be set in the modem. The method of setting them can be used from the Port Forward page.
11:08 PM Thursday; June 22, 2006

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Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
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This is the problem.
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I have a NAS drive which uses Mac's AFP protocol and the Windows SMB protocol AND it can be set to be Time Machine Backup place and can do Bonjour Shares. (it appears 4 times in my list)
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Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
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Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
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Thank you for the information. I am sorry that I have not updated my profile. If I could post on my profile that networking overwhelms me, I would. My firewall is not on (I have had every intention to get that started). I went to set up the firewall and it is asking for information that I just do not know (e.g. DNS Server, Domain, etc.) Should I set it up a particular way?? I have seen some posts recommending PPPoE. Quite honestly, it is Greek to me. I have purchased a book to help me with this information, but I just have not had the time to really read the information (I know that sounds very lazy). I appreciate your help. I have increased the Quicktime streaming rate. We will try again tonight.

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Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

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Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

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