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WEP
cannot be used
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shared
keys cannot be used
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how
to do the WEP key exchange with multiple vendor products
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Authentication
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WWW
authentication may be the only feasible method
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MAC
address by itself is not reliable nor does every card have a smart card
reader
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embedded
into them => more authentication is needed
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Accounting
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how
to bill random users (paying with credit card for access)?
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combined
GSM/WLAN billing is a pretty good idea, how to do it with every
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vendor’s
card?
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VPN
trouble
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with
NAT
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interoperability
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key
distribution is hard
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for
every terminal there’s not a client
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users
cannot be ”forced” to use just one single vendor solution
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