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Chapter 3 Wireless LANs • 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. NWD-270N User's Guide 41

Section	Page
User’s Guide	1
About This User's Guide	3
Document Conventions	4
Safety Warnings	6
Contents Overview	7
Table of Contents	9
Introduction and Configuration	13
Getting Started	15
1.1 Overview	15
1.1.1 What You Need to Know	15
1.1.2 Before You Begin	15
1.2 About Your NWD-270N	16
1.2.1 Hardware	16
1.3 Application Overview	17
1.3.1 Infrastructure	17
1.3.2 Ad-Hoc	17
1.4 Hardware and Utility Installation	18
1.4.1 ZyXEL Utility Icon	18
1.5 Configuration Methods	19
1.5.1 Enabling Windows Wireless Configuration	19
1.5.2 Accessing the ZyXEL Utility	20
Tutorial	21
2.1 Overview	21
2.1.1 What You Can Do in This Tutorial	21
2.1.2 What You Need to Know	21
2.1.3 Before You Begin	22
2.2 Connecting to an AP using Wi-Fi Protected Setup (WPS)	22
2.2.1 Push Button Configuration (PBC)	22
2.2.2 PIN Configuration	23
2.3 Connecting to an AP Without Using WPS	25
2.3.1 Manually Connecting to a Wireless LAN	25
2.3.2 Creating and Using a Profile	27
2.4 Configuring the NWD-270N as an AP	29
Wireless LANs	31
3.1 Overview	31
3.1.1 What You Can Do in This Section	31
3.1.2 What You Need to Know	31
3.1.3 Before You Begin	32
3.2 Wireless LAN Overview	32
3.3 Wireless LAN Security	33
3.3.1 User Authentication and Encryption	33
3.4 WiFi Protected Setup	35
3.4.1 Push Button Configuration	35
3.4.2 PIN Configuration	36
3.4.3 How WPS Works	37
3.4.4 Limitations of WPS	40
Station Mode	43
4.1 Overview	43
4.1.1 What You Can Do in This Section	43
4.1.2 What You Need to Know	43
4.1.3 Before You Begin	44
4.2 ZyXEL Utility Screen Summary	44
4.3 The Link Info Screen	45
4.3.1 Trend Chart	46
4.4 The Site Survey Screen	47
4.4.1 Security Settings	48
4.4.2 Summary Screen	53
4.5 The Profile Screen	53
4.5.1 Adding a New Profile	55
4.6 The Adapter Screen	58
4.6.1 WPS: PBC (Push Button Configuration)	59
4.6.2 WPS: PIN - Use this Device’s PIN	60
4.6.3 WPS: PIN - Use the PIN from the AP or Wireless Router	61
4.7 Security Settings in Windows Vista	61
4.7.1 Using PEAP in Vista	62
4.7.2 Using TLS in Vista	63
AP Mode	65
5.1 Overview	65
5.1.1 What You Can Do in This Section	66
5.1.2 What You Need to Know	66
5.1.3 Before You Begin	67
5.2 AP Mode Screen Summary	67
5.3 The Link Info Screen	68
5.4 The Configuration Screen	69
5.4.1 Security Settings	70
5.5 The MAC Filter Screen	73
Maintenance	75
6.1 Overview	75
6.1.1 What You Can Do in This Section	75
6.1.2 What You Need to Know	75
6.1.3 Before You Begin	75
6.2 The About Screen	76
6.3 Uninstalling the ZyXEL Utility	76
6.4 Upgrading the ZyXEL Utility	77
Troubleshooting and Specifications	79
Troubleshooting	81
7.1 Power, Hardware Connections, and LEDs	81
7.2 Accessing the ZyXEL Utility	82
7.3 Link Quality	82
7.4 Problems Communicating with Other Computers	82
Product Specifications	85
Appendices and Index	89
Wireless LANs	91
Windows Wireless Management	105
Legal Information	127
Customer Support	131

Match case Limit results 1 per page

Chapter 3 Wireless LANs

NWD-270N User’s Guide

•

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.