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Wireless Networking Basics D-1
Appendix D
Wireless Networking Basics
This chapter provides an overview of Wireless networking.
Wireless Networking Overview
The DG834G wireless router conforms to the Institute of Electrical and Electronics Engineers
(IEEE) 802.11b and 802.11g standards for wireless LANs (WLANs). On an 802.11b or g wireless
link, data is encoded using direct-sequence spread-spectrum (DSSS) technology and is transmitted
in the unlicensed radio spectrum at 2.5 GHz. The maximum data rate for the 802.11b wireless link
is 11 Mbps, but it will automatically back down from 11 Mbps to 5.5, 2, and 1 Mbps when the
radio signal is weak or when interference is detected. The 802.11g auto rate sensing rates are 1, 2,
5.5, 6, 9, 12, 18, 24, 36, 48, and 54 Mbps.
The 802.11 standard is also called Wireless Ethernet or Wi-Fi by the Wireless Ethernet
Compatibility Alliance (WECA, see http://www.wi-fi.net), an industry standard group promoting
interoperability among 802.11 devices. The 802.11 standard offers two methods for configuring a
wireless network - ad hoc and infrastructure.
Infrastructure Mode
With a wireless Access Point, you can operate the wireless LAN in the infrastructure mode. This
mode provides wireless connectivity to multiple wireless network devices within a fixed range or
area of coverage, interacting with wireless nodes via an antenna.
In the infrastructure mode, the wireless access point converts airwave data into wired Ethernet
data, acting as a bridge between the wired LAN and wireless clients. Connecting multiple Access
Points via a wired Ethernet backbone can further extend the wireless network coverage. As a
mobile computing device moves out of the range of one access point, it moves into the range of
another. As a result, wireless clients can freely roam from one Access Point domain to another and
still maintain seamless network connection.
- Reference Manual for the 1
- Model Wireless ADSL 1
- Firewall Router DG834G 1
- Contents 5
- Chapter 1 15
- About This Manual 15
- How to Use This Manual 16
- How to Print this Manual 17
- 1-4 About This Manual 18
- Chapter 2 19
- Introduction 19
- A Powerful, True Firewall 20
- Protocol Support 21
- 2-4 Introduction 22
- What’s in the Box? 23
- The Router’s Front Panel 24
- The Router’s Rear Panel 25
- 2-8 Introduction 26
- Chapter 3 27
- Ethernet Cabling Requirements 28
- How to Connect the Router 31
- 54 Mbps Wireless ADSL 32
- LOG IN TO THE DG834G 34
- CONNECT TO THE INTERNET 35
- ADSL Settings 45
- Chapter 4 47
- Wireless Configuration 47
- Wireless Data 48
- Security Options 48
- Range: Up to 300 Feet 48
- Wireless Configuration 4-3 49
- 4-4 Wireless Configuration 50
- Wireless Configuration 4-5 51
- • Security Options 52
- Wireless Configuration 4-9 55
- Wireless Configuration 4-11 57
- 4-12 Wireless Configuration 58
- How to Configure WEP 59
- How to Configure WPA-PSK 60
- Chapter 5 61
- Protecting Your Network 61
- Protecting Your Network 5-3 63
- Firewall Rules 65
- 5-6 Protecting Your Network 66
- Protecting Your Network 5-7 67
- Figure 5-5: Rule example: 67
- 5-8 Protecting Your Network 68
- Protecting Your Network 5-9 69
- 5-10 Protecting Your Network 70
- Order of Precedence for Rules 71
- Services 72
- How to Set Your Time Zone 73
- 5-16 Protecting Your Network 76
- Chapter 6 77
- Managing Your Network 77
- 6-4 Managing Your Network 80
- Managing Your Network 6-5 81
- Figure 6-6 82
- Managing Your Network 6-7 83
- 6-8 Managing Your Network 84
- Viewing Attached Devices 85
- 6-10 Managing Your Network 86
- Managing Your Network 6-11 87
- Examples of Log Messages 88
- Managing Your Network 6-13 89
- Figure 6-9: E-mail menu 89
- 6-14 Managing Your Network 90
- Enabling Remote Management 91
- 6-16 Managing Your Network 92
- Chapter 7 93
- Advanced Configuration 93
- Configuring LAN IP Settings 95
- 7-4 Advanced Configuration 96
- Advanced Configuration 7-5 97
- Configuring Dynamic DNS 99
- How to Configure Dynamic DNS 100
- Using Static Routes 101
- 7-14 Advanced Configuration 106
- 202-10006-05, June 2005 106
- Chapter 8 107
- VPN Tunnel 108
- VPN Tunnel Configuration 112
- Remote PC 118
- 22.23.24.25 would be used 120
- (8 hours) 127
- (1 hour) 127
- Figure 8-23: Remote IP 129
- VPN Tunnel Control 133
- Deactivating a VPN Tunnel 138
- Deleting a VPN Tunnel 141
- • Parameters 150
- — Encryption Algorithm = 3DES 150
- — Pre-shared Key = 12345678 150
- Chapter 9 157
- Troubleshooting 157
- Power LED Not On 158
- LAN or WAN Port LEDs Not On 158
- Troubleshooting 9-3 159
- ADSL link 160
- Obtaining a WAN IP Address 161
- Request timed out 163
- 9-8 Troubleshooting 164
- Problems with Date and Time 165
- 9-10 Troubleshooting 166
- Appendix A 167
- Technical Specifications 167
- A-2 Technical Specifications 168
- Electromagnetic Emissions 168
- Interface Specifications 168
- Appendix B 169
- Network and Routing Basics 169
- Routing Information Protocol 170
- IP Addresses and the Internet 170
- Subnet Addressing 172
- Table 9-2. Netmask Formats 174
- Private IP Addresses 175
- Related Documents 177
- Domain Name Server 177
- IP Configuration by DHCP 177
- What is a Firewall? 178
- Stateful Packet Inspection 178
- Ethernet Cabling 179
- Inside Twisted Pair Cables 180
- Appendix C 183
- Preparing Your Network 183
- C-2 Preparing Your Network 184
- Windows 95B, 98, and Me 186
- Preparing Your Network C-5 187
- Verifying TCP/IP Properties 188
- Preparing Your Network C-7 189
- C-8 Preparing Your Network 190
- Preparing Your Network C-9 191
- C-10 Preparing Your Network 192
- Preparing Your Network C-11 193
- C-12 Preparing Your Network 194
- Preparing Your Network C-13 195
- Properties button 196
- 3. Type ipconfig /all 197
- MacOS 8.6 or 9.x 198
- 4. Click Save 199
- Are Login Protocols Used? 200
- 4. Select the IP Address tab 201
- 5. Select the Gateway tab 201
- Computers 202
- Restarting the Network 203
- C-22 Preparing Your Network 204
- Appendix D 205
- Wireless Networking Basics 205
- 802.11 Authentication 207
- Open System Authentication 207
- Shared Key Authentication 208
- Overview of WEP Parameters 209
- Key Size 210
- Wireless Channels 211
- WPA Wireless Security 212
- How Does WPA Compare to WEP? 213
- Wired Network with Optional 216
- 802.1x Port Based Network 216
- Access Control 216
- Wireless LAN 216
- Product Support for WPA 220
- Is WPA Perfect? 220
- Appendix E 223
- Virtual Private Networking 223
- IPSec Security Features 224
- IPSec Components 224
- Authentication Header (AH) 226
- IKE Security Association 226
- Key Management 228
- VPN Process Overview 229
- Table E-2. Subnet Addressing 230
- VPNC IKE Security Parameters 232
- Testing and Troubleshooting 233
- Additional Reading 233
- Appendix F 235
- NETGEAR VPN Configuration 235
- Step-By-Step Configuration 236
- Click VPN Policies under 237
- Advanced - VPN to invoke 237
- F-4 NETGEAR VPN Configuration 238
- Click IKE Policies under 239
- VPN to invoke this screen 239
- DG834G with FQDN to FVL328 240
- NETGEAR VPN Configuration F-7 241
- Table F-1. Profile Summary 241
- NETGEAR VPN Configuration F-9 243
- Figure F-7: Status Screen 243
- Figure F-10: Status Screen 245
- Figure F-11: ping 172.23.9.1 247
- (Telecommuter Example) 248
- Glossary 263
- 2 Glossary 264
- 4 Glossary 266
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