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Closed != Invisible
Authored by: magill on Jul 03, '02 03:54:39PM

You are in the RF world here -- closed does NOT mean invisible.

Any frequency scanner can find your 802.11 signal... send it to a protocol converter
and tell you lots about it. [Guess what a Stumbler is -- and I have one for my iPaq, it's a very useful tool.]

All that CLOSED means is -- I have a list of MAC addresses, and if you are not on that list this base station won't talk back to you ...

Note however, that you can talk to the base station to your hearts content, in the RF world this is called JAMBING... or in Internet terms a DOS (Denial of Service) attack. Since the 802.11 world operates under Part 15 of the FCC Rules and Regs, you are SOL ... you MUST sit back and take it. 802.11 is unlicensed and a "restriction" of using "unlicensed" RF based services is that you must put up with whatever interference you get stuck with.

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re: Closed != Invisible
Authored by: jasonxz on Jul 04, '02 01:47:26AM

A bit OT; Robert Cringley has an interesting article on bandwith conflicts occuring in the 2.4GHz range at

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Closed != Invisible
Authored by: klieb2002 on Jul 05, '02 01:40:11PM

The above author's point is still valid, but it should be noted that access control via MAC is different from the "closed network" option of Airport. The following is from the document "Designing Airport Networks."

"The closed network option provides additional security by hiding the name of the network created by the Airport Base station."

Access control, which involves specifying which MAC address may access the wire network, is a separate feature, and may be enabled or disabled without interacting with the closed network setting.

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