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Troubleshooting

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ZyXEL G-120 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 G-120 is properly inserted and the LED(s) 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 G-120 under Network Adapter. (Steps may vary depending on the version of Windows). Install the G-120 in another computer. If the error persists, you may have a hardware problem. In this case, you should contact your local vendor. If you install 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 Problems with the Link Quality Table 21 Troubleshooting Link Quality PROBLEM CORRECTIVE ACTION The link quality and/or signal strength is poor all the time. In wireless station mode, search and connect to another AP with a better link quality using the Site Survey screen. Move your computer closer to the AP or the wireless client(s). There may be too much radio interference (for example microwave or another AP using the same channel) around your wireless network. Lower the output power of each AP. Ensure there are not too many wireless stations connected to a wireless network. Chapter 7 Troubleshooting 71

Section	Page
User’s Guide	1
Copyright	3
Certifications	4
Safety Warnings	6
ZyXEL Limited Warranty	7
Customer Support	8
Table of Contents	11
List of Figures	15
List of Tables	17
Preface	19
Getting Started	21
1.2.1 Station Mode	21
1.2.1.1 Infrastructure	21
1.2.1.2 Ad-Hoc	22
1.2.2 Access Point Mode	22
1.2.3 Changing G-120 Mode	23
1.2.4 G-120 Hardware and Utility Installation	24
1.4.1 Enabling WZC	24
1.4.2 Accessing the ZyXEL Utility	25
Tutorial	27
2.1 Connecting to a Wireless LAN	27
2.2 Creating and Using a Profile	29
2.3 Configuring the G-120 as an AP	32
Wireless LAN Network	35
3.2.1 Hide SSID	36
3.2.2 MAC Address Filter	36
3.2.3 User Authentication and Encryption	37
3.2.3.1 WEP	37
3.2.3.2 IEEE 802.1x	38
3.2.3.3 WPA and WPA2	38
3.3.1 Enabling OTIST	39
3.3.1.1 AP	39
3.3.1.2 Wireless Client	40
3.3.2 Starting OTIST	40
3.3.3 Notes on OTIST	41
Wireless Station Mode Configuration	43
4.1.1 ZyXEL Utility Screen Summary	43
4.2 The Link Info Screen	43
4.2.1 Trend Chart	45
4.3 The Site Survey Screen	46
4.3.1 Security Settings	47
4.3.1.1 WEP Encryption	47
4.3.1.2 WPA-PSK/WPA2-PSK	49
4.3.1.3 WPA/WPA2	49
4.3.1.4 802.1x	50
4.3.2 Confirm New Settings	51
4.4 The Profile Screen	52
4.4.1 Adding a New Profile	54
4.5 The Adapter Screen	58
Access Point Mode Configuration	61
5.1.1 ZyXEL Utility Screen Summary	61
5.1.2 Additional Setup Requirements	61
5.2 The Link Info Screen	62
5.3 The Configuration Screen	63
5.4 The MAC Filter Screen	65
Maintenance	67
Troubleshooting	71
7.1 Problems Starting the ZyXEL Utility	71
7.2 Problems with the Link Quality	71
7.3 Problems Communicating With Other Computers	72
Product Specifications	73
Access Point Mode Setup Example	75
Configuring the Computer on Which You Install the G-120	75
Configuring the Wireless Station Computer	77
Management with Wireless Zero Configuration	79
Activating Wireless Zero Configuration	79
Connecting to a Wireless Network	80
Security Settings	83
Association	83
Authentication	85
Ordering the Preferred Networks	88
Wireless Security	91
Types of EAP Authentication	91
EAP-MD5 (Message-Digest Algorithm 5)	91
EAP-TLS (Transport Layer Security)	92
EAP-TTLS (Tunneled Transport Layer Service)	92
PEAP (Protected EAP)	92
LEAP	92
Dynamic WEP Key Exchange	92
WPA and WPA2	93
Encryption	93
User Authentication	94
WPA(2)-PSK Application Example	95
WPA(2) with RADIUS Application Example	95
Security Parameters Summary	96
Setting up Your Computer’s IP Address	97
Windows 98/Me	97
Installing Components	98
Configuring	99
Verifying Settings	100
Windows 2000/XP	100
Verifying Settings	104
Index	105
A	105
C	105
D	105
E	105
F	105
G	105
H	105
I	106
L	106
M	106
N	106
O	106
P	106
Q	106
R	106
S	106
T	106
U	107
V	107
W	107