Impossible, even for you??

[rickyk586]

Is there any way to establish a TCP connection between two client sockets without one of them being a server?

Task: To establish a connection between two computers.

Requirements:

• TCP connection (socket)
• The two computers to be connected cannot listen to ports/accept connections (like a server does).
• The two computers can however initiate a TCP connection (like a client does)
• The network path between the two computers cannot be listened to (sniffed).
• Any number of computers can be used, and these restrictions only apply to the two computers to be connected.

I am 99% sure that this task is impossible, but there are some pretty smart people out there so I may be wrong...

[WingedPanther]

One way this has been done with some software is to have a third computer which is a server.

[Maurice_Z]

Well, since there is no Server to listen to ports, you can't get any data, no matter how hard you try, I think... That's how far my logic can take me ^^

[rickyk586]

Still no one can answer it??

[DuneMan]

trick one I think

[R-G]

Well, this issue is elementary (not so hard to do in the practice as it sounds like, or as some other issues theoretically could be), but it is definitely not conveniently.

I could give you a nice introduction on this issues without any problems, but I don't have every minute free time, so I recommend that all people that are interested in this issue try to search for it in a digital search engine. I suggest that you use appropriate parameters, so you will receive pure useful information.

[rickyk586]

I would love to hear your answer. I have posted this question on many forums, and have searched the internet many times, and I have concluded that this task is impossible.

The connection requires sync numbers which are randomly generated with each connection, so there is no way to determine what the sync number will be (and there is no way to set the sync number in Java anyways).