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