Zyxel-communications NBG-419N Manual do Utilizador descarregar pdf (Página 275)

Appendix D Wireless LANs

NBG-419N User’s Guide

275

32.0.2 WPA(2)-PSK Application Example

A WPA(2)-PSK application looks as follows.

1 First enter identical passwords into the AP and all wireless clients. The Pre-Shared

Key (PSK) must consist of between 8 and 63 ASCII characters (including spaces

and symbols).

2 The AP checks each wireless client's password and (only) allows it to join the

network if the password matches.

3 The AP derives and distributes keys to the wireless clients.

4 The AP and wireless clients use the TKIP or AES encryption process to encrypt

data exchanged between them.

Figure 171 WPA(2)-PSK Authentication

32.0.3 WPA(2) with RADIUS Application Example

You need the IP address of the RADIUS server, its port number (default is 1812),

and the RADIUS shared secret. A WPA(2) application example with an external

RADIUS server looks as follows. "A" is the RADIUS server. "DS" is the distribution

system.

1 The AP passes the wireless client's authentication request to the RADIUS server.

2 The RADIUS server then checks the user's identification against its database and

grants or denies network access accordingly.

3 The RADIUS server distributes a Pairwise Master Key (PMK) key to the AP that

then sets up a key hierarchy and management system, using the pair-wise key to

dynamically generate unique data encryption keys to encrypt every data packet

that is wirelessly communicated between the AP and the wireless clients.

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Zyxel-communications NBG-419N Manual do Utilizador Página 275