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Reference Manual for the 54 Mbps Wireless ADSL Firewall Router DG834G
Network and Routing Basics B-9
202-10006-01
This scheme offers the additional benefit of firewall-like protection because the internal LAN
addresses are not available to the Internet through the translated connection. All incoming
inquiries are filtered out by the router. This filtering can prevent intruders from probing your
system. However, using port forwarding, you can allow one PC (for example, a Web server) on
your local network to be accessible to outside users.
MAC Addresses and Address Resolution Protocol
An IP address alone cannot be used to deliver data from one LAN device to another. To send data
between LAN devices, you must convert the IP address of the destination device to its media
access control (MAC) address. Each device on an Ethernet network has a unique MAC address,
which is a 48-bit number assigned to each device by the manufacturer. The technique that
associates the IP address with a MAC address is known as address resolution. Internet Protocol
uses the Address Resolution Protocol (ARP) to resolve MAC addresses.
If a device sends data to another station on the network and the destination MAC address is not yet
recorded, ARP is used. An ARP request is broadcast onto the network. All stations on the network
receive and read the request. The destination IP address for the chosen station is included as part of
the message so that only the station with this IP address responds to the ARP request. All other
stations discard the request.
Related Documents
The station with the correct IP address responds with its own MAC address directly to the sending
device. The receiving station provides the transmitting station with the required destination MAC
address. The IP address data and MAC address data for each station are held in an ARP table. The
next time data is sent, the address can be obtained from the address information in the table.
For more information about address assignment, refer to the IETF documents RFC 1597, Address
Allocation for Private Internets, and RFC 1466, Guidelines for Management of IP Address Space.
For more information about IP address translation, refer to RFC 1631, The IP Network Address
Translator (NAT).
- Reference Manual for the 1
- 54 Mbps Wireless ADSL 1
- Firewall Router DG834G 1
- Contents 5
- Contents xi 11
- Glossary 11
- Chapter 1 13
- About This Guide 13
- How to Use this Manual 14
- How to Print this Manual 15
- 4 About This Guide 16
- Chapter 2 17
- Introduction 17
- Key Features 18
- Content Filtering 19
- Protocol Support 19
- 2-4 Introduction 20
- What’s in the Box? 21
- The Router’s Front Panel 22
- The Router’s Rear Panel 23
- 2-8 Introduction 24
- Chapter 3 25
- Ethernet Cabling Requirements 26
- How to Connect the Router 29
- LOG IN TO THE DG834G 32
- CONNECT TO THE INTERNET 33
- ISP Does Not Require Login 39
- ISP Does Require Login 39
- ADSL Settings 43
- Chapter 4 45
- Wireless Configuration 45
- Wireless Data 46
- Security Options 46
- Range: Up to 300 Feet 46
- Wireless Configuration 4-3 47
- 4-4 Wireless Configuration 48
- 4-6 Wireless Configuration 50
- Wireless Configuration 4-9 53
- How to Configure WEP 54
- 4-12 Wireless Configuration 56
- Chapter 5 57
- Protecting Your Network 57
- Protecting Your Network 5-3 59
- Firewall Rules 61
- 5-6 Protecting Your Network 62
- Figure 5-4: Rules menu 62
- Protecting Your Network 5-7 63
- 5-8 Protecting Your Network 64
- Protecting Your Network 5-9 65
- 5-10 Protecting Your Network 66
- Order of Precedence for Rules 67
- Services 68
- How to Set Your Time Zone 69
- 5-16 Protecting Your Network 72
- Chapter 6 73
- Managing Your Network 73
- 6-4 Managing Your Network 76
- Managing Your Network 6-5 77
- 6-6 Managing Your Network 78
- Figure 6-6 79
- 6-8 Managing Your Network 80
- Viewing Attached Devices 81
- 6-10 Managing Your Network 82
- Managing Your Network 6-11 83
- Examples of Log Messages 84
- Managing Your Network 6-13 85
- 6-14 Managing Your Network 86
- Figure 6-9: Diagnostics menu 86
- Enabling Remote Management 87
- 6-16 Managing Your Network 88
- Chapter 7 89
- Advanced Configuration 89
- Configuring LAN IP Settings 91
- 7-4 Advanced Configuration 92
- Advanced Configuration 7-5 93
- Configuring Dynamic DNS 95
- How to Configure Dynamic DNS 96
- Using Static Routes 97
- 7-12 Advanced Configuration 100
- 202-10006-01 100
- Chapter 8 101
- Troubleshooting 101
- Power LED Not On 102
- LAN or WAN Port LEDs Not On 102
- Troubleshooting 8-3 103
- ADSL link 104
- Obtaining a WAN IP Address 105
- Request timed out 107
- 8-8 Troubleshooting 108
- Problems with Date and Time 109
- 8-10 Troubleshooting 110
- Appendix A 111
- Technical Specifications 111
- T1.413, G.DMT, G.Lite 112
- ITU Annex A or B 112
- Appendix B 113
- Network and Routing Basics 113
- What is a Router? 114
- Routing Information Protocol 114
- IP Addresses and the Internet 114
- Subnet Addressing 117
- Table 8-2. Netmask Formats 118
- Private IP Addresses 119
- Related Documents 121
- Domain Name Server 122
- IP Configuration by DHCP 122
- Ethernet Cabling 123
- Category 5 Cable Quality 124
- Inside Twisted Pair Cables 125
- Appendix C 129
- Preparing Your Network 129
- C-2 Preparing Your Network 130
- Windows 95B, 98, and Me 132
- Preparing Your Network C-5 133
- Verifying TCP/IP Properties 134
- Preparing Your Network C-7 135
- C-8 Preparing Your Network 136
- Preparing Your Network C-9 137
- C-10 Preparing Your Network 138
- Preparing Your Network C-11 139
- C-12 Preparing Your Network 140
- Preparing Your Network C-13 141
- Properties button 142
- 3. Type ipconfig /all 143
- MacOS 8.6 or 9.x 144
- 4. Click Save 145
- Are Login Protocols Used? 146
- 4. Select the IP Address tab 147
- 5. Select the Gateway tab 147
- Computers 148
- Restarting the Network 149
- C-22 Preparing Your Network 150
- Appendix D 151
- Wireless Networking Basics 151
- Authentication and WEP 152
- 802.11b Authentication 153
- Open System Authentication 153
- PWR TEST 154
- Key Size 156
- WEP Configuration Options 156
- Wireless Channels 157
- Glossary 159
- 2 Glossary 160
- 4 Glossary 162
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