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Old 06-25-2009, 06:58 PM   #1
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Default How do certain apps work w/ no port forwarding?

I have played many multiplayer games in the past, and I have noticed that some of them have no trouble operating behind a router, even with no port forwarding of any kind, and some just can't do it.

For example, Guild Wars and Left 4 Dead are able to connect fine through my router, but Age of Empires can't.

I thought at first it might be because, since GW and l4d were connecting to a server, they might using cgi calls to get and store data, but thats much too slow for the amount of traffic they have. Then I thought that possibly they were using a port that was open by default, like port 80, but when I ran a test of that with a simple Java server and client nothing went through.

So now I am stumped. Any ideas as to what the difference is?

-Bucky24
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Old 06-26-2009, 08:34 PM   #2
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Default Re: How do certain apps work w/ no port forwarding?

Do you have any additional firewall?
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Old 06-26-2009, 09:42 PM   #3
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Default Re: How do certain apps work w/ no port forwarding?

Not on my computer. The wireless router is connected to a ComCast broadband modem, and I don't know if that has a firewall or not.

This topic isn't about a specific problem I am having-I am just curious as to why certain programs get through and others don't.

-Bucky24
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Old 06-27-2009, 09:28 AM   #4
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Default Re: How do certain apps work w/ no port forwarding?

I believe that they use NAT.
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