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ZyXEL NWD2205 Manual

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Appendix A Wireless LANs
NWD2205 User’s Guide
64
• Access-Reject
Sent by a RADIUS server rejecting access.
• Access-Accept
Sent by a RADIUS server allowing access.
• Access-Challenge
Sent by a RADIUS server requesting more information in order to allow access.
The access point sends a proper response from the user and then sends another
Access-Request message.
The following types of RADIUS messages are exchanged between the access point
and the RADIUS server for user accounting:
•Accounting-Request
Sent by the access point requesting accounting.
• Accounting-Response
Sent by the RADIUS server to indicate that it has started or stopped accounting.
In order to ensure network security, the access point and the RADIUS server use a
shared secret key, which is a password, they both know. The key is not sent over
the network. In addition to the shared key, password information exchanged is
also encrypted to protect the network from unauthorized access.
Types of EAP Authentication
This section discusses some popular authentication types: EAP-MD5, EAP-TLS,
EAP-TTLS, PEAP and LEAP. Your wireless LAN device may not support all
authentication types.
EAP (Extensible Authentication Protocol) is an authentication protocol that runs on
top of the IEEE 802.1x transport mechanism in order to support multiple types of
user authentication. By using EAP to interact with an EAP-compatible RADIUS
server, an access point helps a wireless station and a RADIUS server perform
authentication.
The type of authentication you use depends on the RADIUS server and an
intermediary AP(s) that supports IEEE 802.1x. .
For EAP-TLS authentication type, you must first have a wired connection to the
network and obtain the certificate(s) from a certificate authority (CA). A certificate
(also called digital IDs) can be used to authenticate users and a CA issues
certificates and guarantees the identity of each certificate owner.
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