Free RADIUS for WLAN - Problems?

[dat nguyen]

I'm using freeRADIUS-1.02 as an Authentication Server for my Wireless LAN. I've read "802.1X 
Port-Based Authentication HOWTO" and I'm still wondering some thing:
 
- What are differences between "unicast key" and "multicast/global key". If unicast key is used 
for encrypting per-client data and if I have 20 client, does that mean Access Point must hold all 
20 per-client unicast key? And if multicast/global key is used for encrypting multicast/broadcast 
traffic, does that mean we have to pre-configure the key in Access Point?
 
- Can someone explain me about "4-way handshake" and how a client derives 128-bits key for 
Encryption and 64-bits key for MIC.
- I want to authenticate my clients with ComputerName\\UserName and i configured my 
radiusd.conf like below:
 realm ntdomain {
   format = prefix
   delimiter = "\\\\"
   ignore_default = no
   ignore_null = no
  } 
Is it right? Is it neccessary to care lowercase or upercase in ComputerName?
 
- And I have a problem with my XP client: after the first successful authentication, when I 
disconnect and reconnect, Instead I must enter my username and password, It automatically 
connect without a login prompt.
 
Thanks in advance!


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