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Thread: How to extract Mac address from client?

  1. Mar 16th, 2007, 06:11 PM #1
    capsulecorpjx
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    How to extract Mac address from client?

    Lets say I have a website or server software (for example Java Servlet website on Apache Webserver, or say my own FTP server I wrote).

    How do I extract the MAC address of TCP/IP packets coming from a client trying to log on? Are there code examples for Java / C++ / .NET?

    This is useful for security reasons, so I know that the user is logging in from the same location he or she usually logs in from.
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  2. Mar 19th, 2007, 01:49 PM #2
    Al42
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    Re: How to extract Mac address from client?

    There's really no way you can tell that the user is at the same location, only that he's using the same MAC address. Since the MAC address can be cloned, or the user can be using a portable NIC, it's very poor security. It's also bad practice to base anything on the user's physical location - where he is should be up to him, not up to you.
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  3. Apr 2nd, 2007, 08:51 PM #3
    rnd me
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    Re: How to extract Mac address from client?

    Quote Originally Posted by capsulecorpjx
    How do I extract the MAC address of TCP/IP packets coming from a client trying to log on? Are there code examples for Java / C++ / .NET?

    you could use a java applet to get the MAC, but obviously not in an FTP scenario.

    unless the remote user is on your lan (in the same subnet mask), it is impossible to get their MAC address!

    the simple reason for this is that MAC addresses are not routed over TCP/IP!

    sorry for the bad news.
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