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machinegunjoe

how do routers know which computer to send info to

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so I was building this simple messaging program and I realized that this probably wouldnt work over the internet if both computers were behind routers.

I was wondering if their was a way to make it so the routers send the right tcp data-grams(packets) to the right computers without having to log in to the routers admin and set up port forwarding?

thanks,

machinegunjoe

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so I was building this simple messaging program and I realized that this probably wouldnt work over the internet if both computers were behind routers.

I was wondering if their was a way to make it so the routers send the right tcp data-grams(packets) to the right computers without having to log in to the routers admin and set up port forwarding?

thanks,

machinegunjoe

Maybe if both computers were on the DMZ?

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Look up UDP hole punching.

Alternatively, if the router has a uPnP interface active, look at one of these programs:

http://www.codeproject.com/KB/IP/PortForward.aspx

http://www.upnpworks.alcidelic.com/

http://miniupnp.tuxfamily.org/files/

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Look up UDP hole punching.

Alternatively, if the router has a uPnP interface active, look at one of these programs:

http://www.codeproject.com/KB/IP/PortForward.aspx

http://www.upnpworks.alcidelic.com/

http://miniupnp.tuxfamily.org/files/

so basically to do the udp hole punching technique i would send a server a datagram on the same port that I would use to communicate with the computer i was trying to communicate with then start communicating with the other computer?

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