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Appendix D Wireless LANs
P-660HN-F1A User’s Guide
408
keys. This prevent all wireless devices sharing the same encryption keys. (a
weakness of WEP)
User Authentication
WPA and WPA2 apply IEEE 802.1x and Extensible Authentication Protocol (EAP) to
authenticate wireless clients using an external RADIUS database. WPA2 reduces
the number of key exchange messages from six to four (CCMP 4-way handshake)
and shortens the time required to connect to a network. Other WPA2
authentication features that are different from WPA include key caching and pre-
authentication. These two features are optional and may not be supported in all
wireless devices.
Key caching allows a wireless client to store the PMK it derived through a
successful authentication with an AP. The wireless client uses the PMK when it tries
to connect to the same AP and does not need to go with the authentication
process again.
Pre-authentication enables fast roaming by allowing the wireless client (already
connecting to an AP) to perform IEEE 802.1x authentication with another AP
before connecting to it.
Wireless Client WPA Supplicants
A wireless client supplicant is the software that runs on an operating system
instructing the wireless client how to use WPA. At the time of writing, the most
widely available supplicant is the WPA patch for Windows XP, Funk Software's
Odyssey client.
The Windows XP patch is a free download that adds WPA capability to Windows
XP's built-in "Zero Configuration" wireless client. However, you must run Windows
XP to use it.
WPA(2) with RADIUS Application Example
To set up WPA(2), 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
A 256-bit Pairwise Master Key (PMK) is derived from the authentication process by
the RADIUS server and the client.
Содержание P-660HN-F1A
Страница 2: ......
Страница 10: ...Contents Overview P 660HN F1A User s Guide 10...
Страница 20: ...Table of Contents P 660HN F1A User s Guide 20...
Страница 21: ...21 PART I User s Guide...
Страница 22: ...22...
Страница 36: ...Chapter 2 Introducing the Web Configurator P 660HN F1A User s Guide 36...
Страница 44: ...Chapter 3 Status Screens P 660HN F1A User s Guide 44...
Страница 77: ...Chapter 4 Tutorials P 660HN F1A User s Guide 77 2 Leave the other settings as their defaults and click Apply...
Страница 84: ...Chapter 4 Tutorials P 660HN F1A User s Guide 84 Physical Port 1 3 exclude port 4 3 Click Apply...
Страница 88: ...Chapter 4 Tutorials P 660HN F1A User s Guide 88...
Страница 103: ...103 PART II Technical Reference...
Страница 104: ...104...
Страница 142: ...Chapter 7 LAN Setup P 660HN F1A User s Guide 142...
Страница 188: ...Chapter 9 Network Address Translation NAT P 660HN F1A User s Guide 188...
Страница 210: ...Chapter 10 Firewalls P 660HN F1A User s Guide 210...
Страница 236: ...Chapter 13 Certificates P 660HN F1A User s Guide 236...
Страница 240: ...Chapter 14 Static Route P 660HN F1A User s Guide 240...
Страница 256: ...Chapter 16 Quality of Service QoS P 660HN F1A User s Guide 256 Figure 111 QoS Class Example Boss 2...
Страница 276: ...Chapter 17 Dynamic DNS Setup P 660HN F1A User s Guide 276...
Страница 288: ...Chapter 18 Remote Management P 660HN F1A User s Guide 288...
Страница 344: ...Chapter 24 Troubleshooting P 660HN F1A User s Guide 344...
Страница 376: ...Appendix A Setting up Your Computer s IP Address P 660HN F1A User s Guide 376...
Страница 386: ...Appendix B Pop up Windows JavaScripts and Java Permissions P 660HN F1A User s Guide 386...
Страница 396: ...Appendix C IP Addresses and Subnetting P 660HN F1A User s Guide 396...
Страница 420: ...Appendix F Legal Information P 660HN F1A User s Guide 420...
Страница 430: ...Index P 660HN F1A User s Guide 430...