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Wireless LANs, N220 User's Guide

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Chapter 3 Wireless LANs configuration interface of the registrar device to discover the key the network is using (if the device supports this feature). Then, you can enter the key into the non-WPS device and join the network as normal (the non-WPS device must also support WPA-PSK or WPA2-PSK). • When you use the PBC method, there is a short period (from the moment you press the button on one device to the moment you press the button on the other device) when any WPS-enabled device could join the network. This is because the registrar has no way of identifying the "correct" enrollee, and cannot differentiate between your enrollee and a rogue device. This is a possible way for a hacker to gain access to a network. You can easily check to see if this has happened. WPS works between only two devices simultaneously, so if another device has enrolled your device will be unable to enroll, and will not have access to the network. If this happens, open the access point's configuration interface and look at the list of associated clients (usually displayed by MAC address). It does not matter if the access point is the WPS registrar, the enrollee, or was not involved in the WPS handshake; a rogue device must still associate with the access point to gain access to the network. Check the MAC addresses of your wireless clients (usually printed on a label on the bottom of the device). If there is an unknown MAC address you can remove it or reset the AP. 48 N220 User's Guide

Section	Page
N220	1
About This User's Guide	3
Document Conventions	5
Safety Warnings	7
Contents Overview	9
Table of Contents	11
Introduction and Configuration	15
Getting Started	17
1.1 Overview	17
1.1.1 What You Need to Know	17
1.1.2 Before You Begin	18
1.2 About Your N220	18
1.2.1 Hardware	18
1.3 Application Overview	19
1.3.1 Infrastructure	19
1.3.2 Ad-Hoc	20
1.4 Hardware and Utility Installation	20
1.4.1 ZyXEL Utility Icon	20
1.5 Configuration Methods	21
1.5.1 Enabling Windows Wireless Configuration	21
1.5.2 Accessing the ZyXEL Utility	21
Tutorial	23
2.1 Overview	23
2.1.1 What You Can Do in This Tutorial	23
2.1.2 What You Need to Know	23
2.1.3 Before You Begin	24
2.2 Connecting to an AP using Wi-Fi Protected Setup (WPS)	24
2.2.1 Push Button Configuration (PBC)	24
2.2.2 PIN Configuration	25
2.3 Connecting to an AP Without Using WPS	29
2.3.1 Manually Connecting to a Wireless LAN	29
2.3.2 Creating and Using a Profile	31
2.4 Configuring the N220 as an AP	34
Wireless LANs	37
3.1 Overview	37
3.1.1 What You Can Do in This Section	37
3.1.2 What You Need to Know	37
3.1.3 Before You Begin	38
3.2 Wireless LAN Overview	38
3.3 Wireless LAN Security	39
3.3.1 User Authentication and Encryption	39
3.4 WiFi Protected Setup	41
3.4.1 Push Button Configuration	42
3.4.2 PIN Configuration	42
3.4.3 How WPS Works	44
3.4.4 Limitations of WPS	47
Station Mode	49
4.1 Overview	49
4.1.1 What You Can Do in This Section	49
4.1.2 What You Need to Know	49
4.1.3 Before You Begin	50
4.2 ZyXEL Utility Screen Summary	50
4.3 The Link Info Screen	51
4.3.1 Trend Chart	53
4.4 The Site Survey Screen	54
4.4.1 Security Settings	55
4.4.2 Summary Screen	61
4.5 The Profile Screen	62
4.5.1 Adding a New Profile	63
4.6 The Adapter Screen	68
4.6.1 WPS: PBC (Push Button Configuration)	69
4.6.2 WPS: PIN - Use this Device’s PIN	69
4.6.3 WPS: PIN - Use the PIN from the AP or Wireless Router	70
4.7 Security Settings in Windows Vista	71
4.7.1 Using PEAP in Vista	72
4.7.2 Using TLS in Vista	73
AP Mode	75
5.1 Overview	75
5.1.1 What You Can Do in This Section	76
5.1.2 What You Need to Know	76
5.1.3 Before You Begin	76
5.2 AP Mode Screen Summary	77
5.3 The Link Info Screen	77
5.4 The Configuration Screen	78
5.4.1 Security Settings	80
5.5 The MAC Filter Screen	82
Maintenance	85
6.1 Overview	85
6.1.1 What You Can Do in This Section	85
6.1.2 What You Need to Know	85
6.1.3 Before You Begin	85
6.2 The About Screen	86
6.3 Uninstalling the ZyXEL Utility	86
6.4 Upgrading the ZyXEL Utility	87
Troubleshooting and Specifications	89
Troubleshooting	91
7.1 Power, Hardware Connections, and LEDs	91
7.2 Accessing the ZyXEL Utility	92
7.3 Link Quality	92
7.4 Problems Communicating with Other Computers	93
Product Specifications	95
Appendices and Index	99
Setting Up Your Computer’s IP Address	101
Wireless LANs	131
Windows Wireless Management	147
Wireless for Windows 7	173
Legal Information	179