> > > >---- Original Message ---- >From: [EMAIL PROTECTED] >To: [EMAIL PROTECTED] >Subject: Re: how to get the mac address(network card physical >address) of a remote computer by its IP address? >Date: Wed, 19 Nov 2008 15:16:34 +0200 > >>On Wed, Nov 19, 2008 at 3:06 PM, ??? <[EMAIL PROTECTED]> >wrote: >> >>> 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.] >>> >>> >>> -- >>> To UNSUBSCRIBE, email to [EMAIL PROTECTED] >>> with a subject of "unsubscribe". Trouble? Contact >>> [EMAIL PROTECTED] >>> >>> >>Well, if the visitor uses DHCP, then his IP will change at some >point, so >>one cannot >>tell the MAC if one knows the IP...however, there are tools like >wireshark >>that can help you >>with MAC's. >> AFAIK the MAC address is only available within a single network. Once the packet leaves the net as an IP packet all knowledge of the MAC disappears. Also wireshark (PKA Ethereal) is designed to do packet analysis by sniffing on a single net (usually by putting the computer on which wireshark is hosted in promiscuous mode). This doesn't work outside the originater's net Larry
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