US Robotics USR2450 Informacje Techniczne Pobierz pdf (Strona 14)

V 2.2 Copyright SystemExperts 2001,2002,2003

Eavesdropping

n Indirect: listening to the network that the wireless

access point is connected to (PROMISC)

n Remember: WEP only encrypts data between the client and

the access point!

n Quite frankly, this is what most people are doing when they

talk about “sniffing wireless”

n Direct: listening to the airwaves (RFMON)

n Sender can not detect eavesdropping

n Frequency band largely determines range

n it is quite possible that it goes outside the building

n special electromagnetic shielding is needed to “stop” leakage

V 2.2 Copyright SystemExperts 2001,2002,2003

MAC Layer

n Can configure the AP to talk to specific Media

Access Control addresses

(MAC, a.k.a. hardware address)

n Not to be confused with Message Authentication Code (MAC)

n Controls access to wired network not wireless

n Some APs will use RADIUS to get the information

n Problem:

n MAC addresses can be manually set very easily

(see next slide)

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US Robotics USR2450 Informacje Techniczne Strona 14