how to get the mac address(network card physical address) of a remote computer by its IP address?

To: "Debian User List" <debian-user@lists.debian.org>
Subject: how to get the mac address(network card physical address) of a remote computer by its IP address?
From: "中和刘" <minxinjianxin@gmail.com>
Date: Wed, 19 Nov 2008 21:06:13 +0800
Message-id: <[🔎] 407c36770811190506y376659b0j64da007f83f405da@mail.gmail.com>

when a user visit my website, it's easy to get the ip address of the
user, but i think IP address is not as stable as mac address, so I
hope I can get the mac address of the user according to its IP
address, is it possible? thanks

-- 
Welcome to visit my home page http://www.starliu.com
[It's only accessable when my pc is turned on, on which it's hosted.]

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