send/receive udp from specific NIC

This is a discussion on send/receive udp from specific NIC within the Networking/Device Communication forums, part of the General Programming Boards category; well the title sort of says it all. I have a computer with multuple ethernet ports, I want to explicitly ...

  1. #1
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    send/receive udp from specific NIC

    well the title sort of says it all. I have a computer with multuple ethernet ports, I want to explicitly use one of those ethernet ports. I know I could configure routing at the OS level to ensure specific port numbers go to a NIC, but is there a way I can control which NIC I use from within a C++ program without modifying the OS?

    FYI I'll be running in a linux enviroment.

    Thanks.

  2. #2
    Registered User valaris's Avatar
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    You can specify what interface you are binding to when calling bind(). That being said which ever interface gets to this port first will own it until it releases it.

  3. #3
    Captain Crash brewbuck's Avatar
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    When you bind, instead of specifying INADDR_ANY, specify the actual IP address of the interface you want to bind to.

    EDIT: The answer is the same if you want to specify the interface for OUTGOING packets as well. Normally, for outgoing packets, you do not bother binding, but that doesn't mean you can't. bind to the proper IP and it should work how you want.
    Code:
    //try
    //{
    	if (a) do { f( b); } while(1);
    	else   do { f(!b); } while(1);
    //}

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