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Reference Manual for the Model DG834 ADSL Firewall Router
Protecting Your Network 4-9
Considerations for Inbound Rules
• If your external IP address is assigned dynamically by your ISP, the IP address may change
periodically as the DHCP lease expires. Consider using the Dynamic DNS feature in the
Advanced menus so that external users can always find your network.
• If the IP address of the local server computer is assigned by DHCP, it may change when the
computer is rebooted. To avoid this, use the Reserved IP address feature in the LAN IP menu
to keep the computer’s IP address constant.
• Local computers must access the local server using the computer’s local LAN address
(192.168.0.11 in the example in Figure 4-6 above). Attempts by local computers to access the
server using the external WAN IP address will fail.
Outbound Rules (Service Blocking)
The DG834 allows you to block the use of certain Internet services by computers on your network.
This is called service blocking or port filtering. You can define an outbound rule to block Internet
access from a local computer based on:
• IP address of the local computer (source address)
• IP address of the Internet site being contacted (destination address)
•Time of day
• Type of service being requested (service port number)
Following is an application example of outbound rules:
- Reference Manual for the 1
- Model DG834 ADSL 1
- Firewall Router 1
- Contents 5
- Chapter 1 11
- About This Guide 11
- How to Use this Manual 12
- How to Print this Manual 13
- 1-4 About This Guide 14
- Chapter 2 15
- Introduction 15
- Key Features 16
- Protocol Support 17
- 2-4 Introduction 18
- What’s in the Box? 19
- ADSL Firewall Router DG834 20
- 2-8 Introduction 22
- Chapter 3 23
- Ethernet Cabling Requirements 24
- How to Connect the Router 27
- '6/ 28
- LOG IN TO THE DG834 30
- CONNECT TO THE INTERNET 31
- ISP Does Not Require Login 37
- ISP Does Require Login 37
- ADSL Settings 41
- Chapter 4 43
- Protecting Your Network 43
- Protecting Your Network 4-3 45
- Firewall Rules 47
- 4-6 Protecting Your Network 48
- Protecting Your Network 4-7 49
- 4-8 Protecting Your Network 50
- Protecting Your Network 4-9 51
- 4-10 Protecting Your Network 52
- Protecting Your Network 4-11 53
- Services 54
- How to Define Services 55
- How to Set Your Time Zone 56
- 4-16 Protecting Your Network 58
- Chapter 5 59
- Managing Your Network 59
- 5-4 Managing Your Network 62
- Managing Your Network 5-5 63
- 5-6 Managing Your Network 64
- Figure 5-6 65
- 5-8 Managing Your Network 66
- Viewing Attached Devices 67
- 5-10 Managing Your Network 68
- Managing Your Network 5-11 69
- Examples of Log Messages 70
- Managing Your Network 5-13 71
- Enabling Remote Management 72
- Configuring Remote Management 73
- 5-16 Managing Your Network 74
- Chapter 6 75
- Advanced Configuration 75
- Configuring LAN IP Settings 77
- 6-4 Advanced Configuration 78
- Advanced Configuration 6-5 79
- Configuring Dynamic DNS 81
- How to Configure Dynamic DNS 82
- Using Static Routes 83
- 6-12 Advanced Configuration 86
- Chapter 7 87
- Troubleshooting 87
- Power LED Not On 88
- LAN or WAN Port LEDs Not On 88
- Troubleshooting 7-3 89
- ADSL link 90
- Obtaining a WAN IP Address 91
- Request timed out 93
- 7-8 Troubleshooting 94
- Problems with Date and Time 95
- 7-10 Troubleshooting 96
- Appendix A 97
- Technical Specifications 97
- T1.413, G.DMT, G.Lite 98
- ITU Annex A or B 98
- Appendix B 99
- Network and Routing Basics 99
- Routing Information Protocol 100
- IP Addresses and the Internet 100
- Subnet Addressing 102
- Network Subnet Node 103
- Table 7-2. Netmask Formats 104
- Private IP Addresses 105
- Related Documents 107
- Domain Name Server 107
- IP Configuration by DHCP 108
- Ethernet Cabling 109
- Category 5 Cable Quality 110
- Inside Twisted Pair Cables 111
- Appendix C 115
- Preparing Your Network 115
- C-2 Preparing Your Network 116
- Windows 95B, 98, and Me 118
- Preparing Your Network C-5 119
- Verifying TCP/IP Properties 120
- Preparing Your Network C-7 121
- C-8 Preparing Your Network 122
- Preparing Your Network C-9 123
- C-10 Preparing Your Network 124
- Preparing Your Network C-11 125
- C-12 Preparing Your Network 126
- Preparing Your Network C-13 127
- Properties button 128
- 3. Type ipconfig /all 129
- MacOS 8.6 or 9.x 130
- 4. Click Save 131
- Are Login Protocols Used? 132
- 4. Select the IP Address tab 133
- 5. Select the Gateway tab 133
- Computers 134
- Restarting the Network 135
- C-22 Preparing Your Network 136
- Glossary 137
- 2 Glossary 138
- 4 Glossary 140
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