Difference Between Port Forwarding and Port Triggering.

Hi guys,
I'm lost! The differences between port forwarding and port triggering is driving me nuts! It all seems very subtle to me. Can anyone explain to me (in a very simple way) what exactly are their differences. Thanks in advance!!

Port Forwarding
The big difference between this and port triggering is that forwarding is fixed.. you forward a port and it is always forwarded.. IE available to connection.. basically the forwarded port is excluded from the fire walling abilities of the router. Second it is static and applies to one machine only. Whereas you could set port triggering to the router and thereafter any machine on the LAN can trigger it unless its already in use.. port forwarding must be specified for each individual machine.
Port forwarding requires you to give each PC on the network its own unique static IP address.. Although there is ssh port forwarding that can be set dynamically. Most users only have the option of static ip port forwarding.
The real downside of port forwarding is that it can be very tricky to set up... You may have to allow a series of ports on a machine and have to do that for each machine you want to allow through. Also routers often have limited abilities and may not allow you the ability to forward a port or select the service you require.
Port Triggering
This is a way of Dynamically assigning a service to a port WHEN it is required by an outgoing service. The port is initially not allowed so nothing can get in and you are protected by your network.
A good example of this is when using Yahoo! voice .. the voice works fine for a few minutes after you connect to Yahoo! then Yahoo! sends some kind of packet that requires a response from your PC... The packet is allowed in through your router no prob but the outgoing reply is not authorized to open a port on the router and is thus blocked.
'ope this helps

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Yes I did a hard reset in order to set it up. I then used the Airport Utility to give it a Network name and base station name that was different from the Wireless AC one upstairs. I left everything else set to defaults and used 'Create a new wireless network'. Added some passwords and then let it boot itself. It all worked ok but as I mentioned I can then only access this downstairs network. The Wireless AC one then refuses to connect afterwards. The only way I can get the Wireless AC to work is to switch off the Wireless N one and then reboot the Wireless AC.
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Hi--
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I am now assuming I will be able to access the 'server' from an external location. Very optimistic! But I can't test that for a couple of days.
Ah, but you've given up too soon! You can access your web server from outside your network real easy: you just need to find an external client you can point back to your site. I like to use the W4C validator to do that. It has the happy side effect of also telling you if your web page markup is valid. So you'd point your browser to the validator page:
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Is the router setup to accept static connections?
I have my router set up to accept both, so from 192.168.1.100 to 192.168.1.192 the addresses are static the other addresses are given by DHCP.
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There have been a number of threads discussing port forwarding and loopback, so I thought it might be useful to summarise my experiences. I have two HomeHub 3Bs on separate lines, one is a standard broadband line, the other is on an Infinity connection. My experience is limited to these two specific devices :-)
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On Loopback, I know various people have said it doesnt work, but it has always worked fine for me, at both the locations where I have a HomeHub 3B. I use a DDNS service and I can test that my port forwarding is working by opening a Command Prompt window on my PC and typing telnet mydomain.dyndns.web.com 21 or whatever. That command contacts my DDNS host to ascertain my IP address and then (attempts to) connect to port 21.
If port 21 is closed on your router (i.e. you have no port forwarding in place) you will see the message attempting to connect to mydomain.dyndns.web.com... and, after a while that will time out, with Could not open connection to the host, on port 21: Connect failed. If you do have your port forwarding set up correctly then your application will respond in some appropriate mannerr. However, you do need to understand what youre doing, because the response of an application that is expecting HTTP data is simply to do nothing! You will probably get a blank screen. If you type GET / HTTP/1.1 [note spaces] (which is not echoed to your screen, so be careful not to mistype it) you will receive a page of HTTP response data and HTML data. Thus proving that your port forwarding is working.
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http://img205.imageshack.us/img205/1497/linksysbg2.jpg
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http://img510.imageshack.us/img510/2131/linksys1rf5.jpg
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