The article on "Getting At Your PC’s Media Access Control ID Number" ( http://langa.com/newsletters/2004/2004-11-22.htm#2 ) brought this informative note:
You wrote: "MAC identification isn’t a foolproof security method". You can say that again! Spoofing a MAC address is simple using readily available utility programs, and MAC spoofing is even a standard feature on many DSL/Cable routers.
– Kevin Davidson
Thanks, Kevin. Using a MAC as the sole authentication for a network would be risky (and many wireless LANs are set up this way), but use of MAC addresses is still a generally good thing when it’s done as one of several overlapping security techniques. See "Wireless Poachers, Wireless Guests" at http://www.informationweek.com/story/IWK20021031S0004 .
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