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RTS/CTS, Fragmentation Threshold

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Appendix D Wireless LANs wireless gateway, but out-of-range of each other, so they cannot "hear" each other, that is they do not know if the channel is currently being used. Therefore, they are considered hidden from each other. Figure 116 RTS/CTS When station A sends data to the AP, it might not know that the station B is already using the channel. If these two stations send data at the same time, collisions may occur when both sets of data arrive at the AP at the same time, resulting in a loss of messages for both stations. RTS/CTS is designed to prevent collisions due to hidden nodes. An RTS/CTS defines the biggest size data frame you can send before an RTS (Request To Send)/CTS (Clear to Send) handshake is invoked. When a data frame exceeds the RTS/CTS value you set (between 0 to 2432 bytes), the station that wants to transmit this frame must first send an RTS (Request To Send) message to the AP for permission to send it. The AP then responds with a CTS (Clear to Send) message to all other stations within its range to notify them to defer their transmission. It also reserves and confirms with the requesting station the time frame for the requested transmission. Stations can send frames smaller than the specified RTS/CTS directly to the AP without the RTS (Request To Send)/CTS (Clear to Send) handshake. You should only configure RTS/CTS if the possibility of hidden nodes exists on your network and the "cost" of resending large frames is more than the extra network overhead involved in the RTS (Request To Send)/CTS (Clear to Send) handshake. If the RTS/CTS value is greater than the Fragmentation Threshold value (see next), then the RTS (Request To Send)/CTS (Clear to Send) handshake will never occur as data frames will be fragmented before they reach RTS/CTS size. Note: Enabling the RTS Threshold causes redundant network overhead that could negatively affect the throughput performance instead of providing a remedy. 170 WAP3205 User's Guide

Section	Page
WAP3205	1
About This User's Guide	3
Document Conventions	5
Safety Warnings	7
Contents Overview	9
Table of Contents	11
Introduction	17
Getting to Know Your WAP3205	19
1.1 Overview	19
1.2 Applications	19
1.3 Ways to Manage the WAP3205	19
1.4 Good Habits for Managing the WAP3205	20
1.5 LEDs	20
Introducing the Web Configurator	23
2.1 Overview	23
2.2 Accessing the Web Configurator	23
2.2.1 Login Screen	24
2.2.2 Password Screen	25
2.2.3 Home Screen	25
2.3 Resetting the WAP3205	27
2.3.1 Procedure to Use the Reset Button	28
Monitor	29
3.1 Overview	29
3.2 What You Can Do	29
3.3 Log	29
3.4 Packet Statistics	30
3.5 WLAN Station Status	32
WAP3205 Modes	33
4.1 Overview	33
4.1.1 Web Configurator Modes	33
4.1.2 Device Modes	33
Easy Mode	35
5.1 Overview	35
5.2 What You Can Do	36
5.3 What You Need to Know	36
5.4 Navigation Panel	37
5.5 Network Map	37
5.6 Control Panel	38
5.6.1 Wireless Security	39
5.6.2 WPS	41
5.7 Status Screen in Easy Mode	42
Access Point Mode	45
6.1 Overview	45
6.2 What You Can Do	45
6.3 What You Need to Know	45
6.3.1 Setting your WAP3205 to AP Mode	46
6.3.2 Accessing the Web Configurator in Access Point Mode	46
6.3.3 Configuring your WLAN, LAN and Maintenance Settings	47
6.4 AP Mode Status Screen	47
Client Mode	53
7.1 Overview	53
7.2 What You Can Do	53
7.3 What You Need to Know	54
7.3.1 Setting your WAP3205 to Client Mode	54
7.3.2 Accessing the Web Configurator in Client Mode	54
7.4 Client Mode Status Screen	55
7.5 Wireless LAN Profile Screen	57
7.5.1 Adding a New WLAN Profile	58
7.5.2 Site Survey Screen	62
7.5.3 WPS Screen	63
Universal Repeater Mode	65
8.1 Overview	65
8.2 What You Can Do	65
8.3 What You Need to Know	66
8.3.1 Setting your WAP3205 to Universal Repeater Mode	66
8.3.2 Accessing the Web Configurator in Universal Repeater Mode	66
8.4 Universal Repeater Mode Status Screen	67
8.5 Universal Repeater Screen	69
8.5.1 No Security	70
8.5.2 Static WEP	70
8.5.3 WPA(2)-PSK	72
Tutorials	73
9.1 Overview	73
9.2 Connecting to the Internet from an Access Point	73
9.3 Configuring Wireless Security Using WPS	73
9.3.1 Push Button Configuration (PBC)	74
9.3.2 PIN Configuration	75
9.4 Enabling and Configuring Wireless Security (No WPS)	77
9.4.1 Configure Your Notebook	79
Configuration	81
Wireless LAN	83
10.1 Overview	83
10.2 What You Can Do	84
10.3 What You Should Know	84
10.3.1 Wireless Security Overview	84
10.4 General Wireless LAN Screen	87
10.5 Wireless Security Screen	88
10.5.1 No Security	88
10.5.2 WEP Encryption	89
10.5.3 WPA-PSK/WPA2-PSK	91
10.6 MAC Filter	92
10.7 Wireless LAN Advanced Screen	93
10.8 Quality of Service (QoS) Screen	95
10.9 WPS Screen	95
10.10 WPS Station Screen	97
10.11 Scheduling Screen	97
10.12 WDS Screen	99
LAN	101
11.1 Overview	101
11.2 What You Can Do	101
11.3 What You Need To Know	102
11.3.1 LAN TCP/IP	102
11.3.2 IP Alias	102
11.4 LAN IP Screen	103
11.5 IP Alias Screen	104
Maintenance and Troubleshooting	105
Maintenance	107
12.1 Overview	107
12.2 What You Can Do	107
12.3 General Screen	108
12.4 Password Screen	108
12.5 Time Setting Screen	109
12.6 Firmware Upgrade Screen	111
12.7 Configuration Backup/Restore Screen	113
12.8 Reset/Restart Screen	114
12.9 System Operation Mode Overview	115
12.10 Sys Op Mode Screen	116
Troubleshooting	119
13.1 Power, Hardware Connections, and LEDs	119
13.2 WAP3205 Access and Login	120
13.3 Internet Access	122
13.4 Resetting the WAP3205 to Its Factory Defaults	123
13.5 Wireless Router/AP Troubleshooting	124
Product Specifications	125
14.1 Wall-mounting Instructions	126
Appendices and Index	129
Pop-up Windows, JavaScripts and Java Permissions	131
IP Addresses and Subnetting	139
Setting up Your Computer’s IP Address	149
Wireless LANs	167
Common Services	179
Legal Information	183