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c#tcptcpclientlantcplistener

TCPclient in C# with public IP

Is it possible to use TCPclient and TCPlistener in c# with public IP addresses (or outside my LAN)? If NAT randomly assigns port number to each LAN communication, is there any way to know what port-number will be assigned to TCPlistener by its NAT-router to make TCPclient be able to communicate with it. P.S. If it's not possible is there any other tool/technique to communicate outside the LAN without reconfiguring router (to forward all the messages to TCPlistener)?

Solution

  • Have a look at

    TcpListener.AllowNatTraversal

    This can be done with Toredo, 6to4, or an ISATAP tunnel.

    Another option is UPnP if your NAT device supports it.