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Troubleshooting

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ZyXEL AG-225H v2 User's Guide CHAPTER 7 Troubleshooting This chapter covers potential problems and the possible remedies. After each problem description, some instructions are provided to help you to diagnose and to solve the problem. 7.1 Problems Starting the ZyXEL Utility Table 20 Troubleshooting Starting ZyXEL Utility PROBLEM Cannot start the ZyXEL Wireless LAN utility The ZyXEL utility icon does not display. CORRECTIVE ACTION Make sure the AG-225H v2 is properly inserted and the LED is on. Refer to the Quick Start Guide for the LED descriptions. Use the Device Manager to check for possible hardware conflicts. Click Start, Settings, Control Panel, System, Hardware and Device Manager. Verify the status of the AG-225H v2 under Network Adapter. (Steps may vary depending on the version of Windows). Install the AG-225H v2 in another computer. If the error persists, you may have a hardware problem. In this case, you should contact your local vendor. If you have installed the Funk Odyssey Client software on the computer, uninstall (remove) both the Funk Odyssey Client software and ZyXEL utility, and then install the ZyXEL utility again after restarting the computer. 7.2 Problem Connecting to an Access Point Table 21 Troubleshooting Access Point Connection Problem PROBLEM CORRECTIVE ACTION When using the Windows XP configuration tool, the AG-225H v2 cannot scan for or connect to any access points. The AG-225H v2 might still be operating in access point mode. This results when you set the AG-225H v2 to operate in access point mode using the ZyXEL utility, close the ZyXEL utility and then use the Windows XP configuration tool. Before you use the Windows XP configuration tool, make sure you set the AG225H v2 to operate in station mode before you close and exit the ZyXEL utility. Chapter 7 Troubleshooting 67

Section	Page
User’s Guide	1
Copyright	3
Certifications	3
ZyXEL Limited Warranty	5
Customer Support	6
Table of Contents	9
List of Figures	13
List of Tables	15
Preface	17
Getting Started	19
1.1 About Your AG-225H v2	19
1.2 Application Overview	19
1.2.1 Station Mode	19
1.2.1.1 Infrastructure	19
1.2.1.2 Ad-Hoc	20
1.2.2 Access Point Mode	21
1.2.3 Changing AG-225H v2 Mode	21
1.3 AG-225H v2 Hardware and Utility Installation	22
1.3.1 ZyXEL Utility Icon	22
1.4 Configuration Methods	22
1.4.1 Enabling WZC	22
1.4.2 Accessing the ZyXEL Utility	23
Tutorial	25
2.1 Connecting to a Wireless LAN	25
2.2 Creating and Using a Profile	27
2.3 Configuring the AG-225H v2 as an AP	31
Wireless LAN Network	33
3.1 Wireless LAN Overview	33
3.2 Wireless LAN Security	34
3.2.1 Hide SSID	34
3.2.2 MAC Address Filter	34
3.2.3 User Authentication and Encryption	35
3.2.3.1 WEP	35
3.2.3.2 IEEE 802.1x	36
3.2.3.3 WPA and WPA2	36
Wireless Station Mode Configuration	39
4.1 Wireless Station Mode Overview	39
4.1.1 ZyXEL Utility Screen Summary	39
4.2 The Link Info Screen	40
4.2.1 Trend Chart	41
4.3 The Site Survey Screen	42
4.3.1 Security Settings	43
4.3.1.1 WEP Encryption	43
4.3.1.2 WPA-PSK/WPA2-PSK	44
4.3.1.3 WPA/WPA2	45
4.3.1.4 IEEE 802.1x	46
4.3.2 Confirm Save Screen	47
4.4 The Profile Screen	48
4.4.1 Adding a New Profile	50
4.5 The Adapter Screen	54
Access Point Mode Configuration	57
5.1 Access Point Mode Introduction	57
5.1.1 ZyXEL Utility Screen Summary	57
5.1.2 Additional Setup Requirements	58
5.2 The Link Info Screen	58
5.3 The Configuration Screen	59
5.4 The MAC Filter Screen	61
Maintenance	63
6.1 The About Screen	63
6.2 Uninstalling the ZyXEL Utility	63
6.3 Upgrading the ZyXEL Utility	64
Troubleshooting	67
7.1 Problems Starting the ZyXEL Utility	67
7.2 Problem Connecting to an Access Point	67
7.3 Problem with the Link Quality	68
7.4 Problems Communicating With Other Computers	68
Product Specifications	69
Access Point Mode Setup Example	71
Configuring the Computer on Which You Install the AG-225H v2	71
Configuring the Wireless Station Computer	73
Management with Wireless Zero Configuration	75
Activating Wireless Zero Configuration	75
Connecting to a Wireless Network	76
Security Settings	79
Association	79
Authentication	81
Ordering the Preferred Networks	84
Wireless Security	87
Types of EAP Authentication	87
EAP-MD5 (Message-Digest Algorithm 5)	87
EAP-TLS (Transport Layer Security)	88
EAP-TTLS (Tunneled Transport Layer Service)	88
PEAP (Protected EAP)	88
LEAP	88
Dynamic WEP Key Exchange	88
WPA and WPA2	89
Encryption	89
User Authentication	90
WPA(2)-PSK Application Example	91
WPA(2) with RADIUS Application Example	91
Security Parameters Summary	92
Setting up Your Computer’s IP Address	93
Windows 2000/XP	93
Verifying Settings	97
Index	99
A	99
C	99
D	99
E	99
F	99
G	99
H	99
I	99
K	100
L	100
M	100
N	100
O	100
P	100
Q	100
R	100
S	100
T	101
U	101
V	101
W	101