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Reference Manual for the Model DG834GT 108 Mbps Super Wireless ADSL Router
Network and Routing Basics B-11
August 2004
Denial of Service Attack
A hacker may be able to prevent your network from operating or communicating by launching a
Denial of Service (DoS) attack. The method used for such an attack can be as simple as merely
flooding your site with more requests than it can handle. A more sophisticated attack may attempt
to exploit some weakness in the operating system used by your router or gateway. Some operating
systems can be disrupted by simply sending a packet with incorrect length information.
Ethernet Cabling
Although Ethernet networks originally used thick or thin coaxial cable, most installations currently
use unshielded twisted pair (UTP) cabling. The UTP cable contains eight conductors, arranged in
four twisted pairs, and terminated with an RJ45 type connector. A normal straight-through UTP
Ethernet cable follows the EIA568B standard wiring as described below in Table B-1
.
Category 5 Cable Quality
Category 5 distributed cable that meets ANSI/EIA/TIA-568-A building wiring standards can be a
maximum of 328 feet (ft.) or 100 meters (m) in length, divided as follows:
20 ft. (6 m) between the hub and the patch panel (if used)
295 ft. (90 m) from the wiring closet to the wall outlet
Table B-1. UTP Ethernet cable wiring, straight-through
Pin Wire color Signal
1 Orange/White Transmit (Tx) +
2 Orange Transmit (Tx) -
3 Green/White Receive (Rx) +
4Blue
5 Blue/White
6 Green Receive (Rx) -
7 Brown/White
8Brown
- Reference Manual for the 1
- Model DG834GT 108 1
- Mbps Super Wireless 1
- ADSL Router 1
- Contents 5
- Chapter 1 13
- About This Guide 13
- How to Use this Manual 14
- How to Print this Manual 15
- 1-4 About This Guide 16
- Chapter 2 17
- Introduction 17
- Key Features 18
- A Powerful, True Firewall 19
- Protocol Support 20
- Content Filtering 21
- What’s in the Box? 22
- Introduction 2-7 23
- The Router’s Rear Panel 24
- Introduction 2-9 25
- 2-10 Introduction 26
- Chapter 3 27
- Ethernet Cabling Requirements 28
- How to Connect the Router 31
- &RPSXWHU 34
- LOG IN TO THE DG834GT 35
- CONNECT TO THE INTERNET 36
- ADSL Settings 46
- 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
- Figure 4-3: 108 Mbps Logo 51
- 4-6 Wireless Configuration 52
- 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 Define Services 73
- How to Set Your Time Zone 74
- 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
- 7-12 Advanced Configuration 104
- August 2004 104
- Troubleshooting 105
- Chapter 8 105
- Power LED Not On 106
- LAN or WAN Port LEDs Not On 106
- Troubleshooting 8-3 107
- ADSL link 108
- Obtaining a WAN IP Address 109
- Request timed out 111
- 8-8 Troubleshooting 112
- Problems with Date and Time 113
- 8-10 Troubleshooting 114
- Appendix A 115
- Technical Specifications 115
- A-2 Technical Specifications 116
- Electromagnetic Emissions 116
- Interface Specifications 116
- Appendix B 117
- Network and Routing Basics 117
- Routing Information Protocol 118
- IP Addresses and the Internet 118
- Subnet Addressing 120
- Table 8-2. Netmask Formats 122
- Private IP Addresses 123
- Related Documents 125
- Domain Name Server 125
- IP Configuration by DHCP 125
- What is a Firewall? 126
- Stateful Packet Inspection 126
- Ethernet Cabling 127
- Inside Twisted Pair Cables 128
- Appendix C 131
- Preparing Your Network 131
- C-2 Preparing Your Network 132
- Windows 95B, 98, and Me 134
- Preparing Your Network C-5 135
- Verifying TCP/IP Properties 136
- Preparing Your Network C-7 137
- C-8 Preparing Your Network 138
- Preparing Your Network C-9 139
- C-10 Preparing Your Network 140
- Preparing Your Network C-11 141
- C-12 Preparing Your Network 142
- Preparing Your Network C-13 143
- Properties button 144
- 3. Type ipconfig /all 145
- MacOS 8.6 or 9.x 146
- 4. Click Save 147
- Are Login Protocols Used? 148
- 4. Select the IP Address tab 149
- 5. Select the Gateway tab 149
- Computers 150
- Restarting the Network 151
- C-22 Preparing Your Network 152
- Appendix D 153
- Wireless Networking Basics 153
- 802.11 Authentication 155
- Open System Authentication 155
- Shared Key Authentication 156
- Overview of WEP Parameters 157
- Key Size 158
- Wireless Channels 159
- WPA Wireless Security 160
- How Does WPA Compare to WEP? 161
- Wired Network with Optional 164
- 802.1x Port Based Network 164
- Access Control 164
- Wireless LAN 164
- Is WPA Perfect? 168
- Product Support for WPA 168
- Glossary 171
- -6 Glossary 176
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