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Appendix C Wireless LANs
NWD-270N User’s Guide
77
RADIUS
RADIUS is based on a client-server model that supports authentication, authorization and
accounting. The access point is the client and the server is the RADIUS server. The RADIUS
server handles the following tasks:
• Authentication
Determines the identity of the users.
• Authorization
Determines the network services available to authenticated users once they are connected
to the network.
• Accounting
Keeps track of the client’s network activity.
RADIUS is a simple package exchange in which your AP acts as a message relay between the
wireless client and the network RADIUS server.
Types of RADIUS Messages
The following types of RADIUS messages are exchanged between the access point and the
RADIUS server for user authentication:
• Access-Request
Sent by an access point requesting authentication.
• 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.
- NWD-270N 1
- About This User's Guide 3
- Document Conventions 4
- Icons Used in Figures 5
- Safety Warnings 6
- Table of Contents 7
- CHAPTER 1 9
- 1.2 Features 10
- 1.3 Hardware Installation 11
- 1.4 Software Installation 11
- Chapter 1 Getting Started 12
- NWD-270N User’s Guide 12
- Chapter 1 Getting Started 13
- 1.5 Device Applications 15
- CHAPTER 2 17
- 2.2 Wireless LAN Overview 18
- 2.3 Wireless LAN Security 19
- Chapter 2 Wireless LANs 20
- 2.4 WiFi Protected Setup 21
- 2.4.2 PIN Configuration 22
- 2.4.3 How WPS Works 23
- Figure 6 How WPS works 24
- REGISTRARENROLLEE 25
- SECURITY INFO 25
- REGISTRAR 25
- ENROLLEE 25
- EXISTING CONNECTION 25
- 2.4.4 Limitations of WPS 26
- Chapter 2 Wireless LANs 27
- CHAPTER 3 29
- 3.1.3 Before You Begin 30
- 3.3 The Profile Screen 31
- 3.6 The Link Status Screen 35
- 3.7 The Site Survey Screen 36
- 3.8 The Statistics Screen 37
- 3.9 The Advanced Screen 39
- 3.10 The WPS Screen 40
- 3.11 The About Screen 44
- CHAPTER 4 45
- 4.4 Link Quality 46
- Chapter 4 Troubleshooting 47
- Chapter 4 Troubleshooting 48
- CHAPTER 5 49
- APPENDIX A 53
- Verifying Settings 56
- Mac OS X: 10.5 57
- APPENDIX B 61
- Subnet Masks 62
- Notation 63
- Subnetting 64
- Example: Four Subnets 65
- Example: Eight Subnets 66
- Subnet Planning 67
- Configuring IP Addresses 68
- IP Address Conflicts 69
- APPENDIX C 71
- Appendix C Wireless LANs 72
- Figure 29 Basic Service Set 72
- Appendix C Wireless LANs 73
- Figure 31 RTS/CTS 74
- Fragmentation Threshold 75
- Preamble Type 75
- IEEE 802.11g Wireless LAN 75
- Wireless Security Overview 76
- IEEE 802.1x 76
- Types of RADIUS Messages 77
- Types of EAP Authentication 78
- Dynamic WEP Key Exchange 79
- WPA and WPA2 80
- User Authentication 81
- Security Parameters Summary 83
- Antenna Overview 83
- Antenna Characteristics 83
- Types of Antennas for WLAN 84
- Positioning Antennas 84
- APPENDIX D 85
- 者均不得擅自變更頻率、加大功率或變更原設計之特性及功能。 86
- 有干擾現象時，應立即停用，並改善至無干擾時方得繼續使用。 86
- ZyXEL Limited Warranty 87
- Appendix D Legal Information 88
- APPENDIX E 89
- Appendix E Customer Support 90
- Appendix E Customer Support 91
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