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Wireless-N ADSL2+ Modem Router DGN2000 Reference Manual
Protecting Your Network 3-9
v1.0, July 2008
Considerations for Inbound Rules
• If your external IP address is assigned dynamically by your ISP, the IP address might change
periodically as the DHCP lease expires. Consider using the Dynamic DNS screen so that
external users can always find your network.
• If the IP address of the local server computer is assigned by DHCP, it might change when the
computer is rebooted. To avoid this, use the Reserved IP address feature in the LAN IP Setup
screen 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 the previous figure). Attempts by local computers to access
the server using the external WAN IP address will fail.
Outbound Rules (Service Blocking)
The modem router 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 the following:
• 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.
Outbound Rule Example: Blocking Instant Messenger
If you want to block Instant Messenger usage by employees during working hours, you can create
an outbound rule to block that application from any internal IP address to any external address
according to the schedule that you create in the Schedule screen.You can specify that the modem
router logs any attempt to use Instant Messenger during this blocked period. You can also open or
close AOL or MSN Instant Messenger ports: see the Firewall Rules screen in the “Order of
Precedence for Rules” section on page 3-11.
- Wireless-N ADSL2+ 1
- Modem Router DGN2000 1
- Reference Manual 1
- Contents 7
- About This Manual 11
- Italics Emphasis, books 12
- Italics URL links 12
- How to Use This Manual 13
- How to Print this Manual 13
- Revision History 14
- Chapter 1 15
- Figure 1-1 17
- Figure 1-2 17
- Figure 1-3 18
- ISP does not require login 22
- ISP does require login 22
- ADSL Settings 25
- Chapter 2 27
- Wireless Security Options 29
- Figure 2-2 31
- Table 2-1. Wireless Settings 33
- Figure 2-3 38
- Figure 2-4 41
- Network and Security 43
- Figure 2-5 44
- Figure 2-6 45
- Figure 2-7 45
- Chapter 3 49
- Protecting Your Network 49
- 3-2 Protecting Your Network 50
- Figure 3-1 50
- Figure 3-2 50
- to perform these functions 51
- 3-4 Protecting Your Network 52
- Figure 3-3 52
- Firewall Rules 53
- 3-6 Protecting Your Network 54
- Figure 3-4 54
- Protecting Your Network 3-7 55
- Figure 3-5 55
- 3-8 Protecting Your Network 56
- Figure 3-6 56
- Protecting Your Network 3-9 57
- 3-10 Protecting Your Network 58
- Figure 3-7 58
- Order of Precedence for Rules 59
- Services 60
- Protecting Your Network 3-13 61
- Figure 3-9 61
- Figure 3-10 61
- How to Set Your Time Zone 62
- Protecting Your Network 3-15 63
- 3-16 Protecting Your Network 64
- Chapter 4 65
- Managing Your Network 65
- 4-2 Managing Your Network 66
- Figure 4-1 66
- Managing Your Network 4-3 67
- 4-4 Managing Your Network 68
- Figure 4-2 68
- Managing Your Network 4-5 69
- Figure 4-3 69
- Figure 4-4 69
- 4-6 Managing Your Network 70
- Managing Your Network 4-7 71
- 4-8 Managing Your Network 72
- Figure 4-5 72
- Managing Your Network 4-9 73
- Figure 4-6 73
- Viewing Attached Devices 74
- Managing Your Network 4-11 75
- Figure 4-8 75
- 4-12 Managing Your Network 76
- Examples of Log Messages 77
- 4-14 Managing Your Network 78
- Figure 4-9 78
- Modem Router 79
- Configuring Remote Management 80
- Managing Your Network 4-17 81
- Figure 4-11 81
- Automatic Firmware Recovery 82
- Managing Your Network 4-19 83
- 4-20 Managing Your Network 84
- Chapter 5 85
- Advanced Configuration 85
- 5-2 Advanced Configuration 86
- Other WAN Options 87
- Configuring LAN IP Settings 88
- Advanced Configuration 5-5 89
- Figure 5-2 89
- Configuring DHCP 90
- Advanced Configuration 5-7 91
- 5-8 Advanced Configuration 92
- Figure 5-3 92
- Configuring Dynamic DNS 93
- How to Configure Dynamic DNS 93
- Using Static Routes 94
- Advanced Configuration 5-11 95
- Figure 5-5 95
- 5-12 Advanced Configuration 96
- Figure 5-6 96
- Advanced Configuration 5-13 97
- Figure 5-7 97
- Figure 5-8 97
- 5-14 Advanced Configuration 98
- Advanced Configuration 5-15 99
- Figure 5-9 99
- 5-16 Advanced Configuration 100
- Figure 5-10 100
- Advanced Configuration 5-17 101
- Figure 5-11 101
- 5-18 Advanced Configuration 102
- Figure 5-12 103
- Advanced Configuration 5-19 103
- 5-20 Advanced Configuration 104
- Advanced Configuration 5-21 105
- Figure 5-13 105
- Figure 5-14 105
- 5-22 Advanced Configuration 106
- Chapter 6 107
- Troubleshooting 107
- Interface 108
- Power LED Is Not On 108
- Power LED Is Red 108
- Troubleshooting 6-3 109
- ADSL Link 110
- Internet LED is Red 111
- 6-6 Troubleshooting 112
- Troubleshooting 6-7 113
- Troubleshooting 6-9 115
- Problems with Date and Time 116
- Appendix A 117
- Technical Specifications 117
- Default Configuration 118
- Technical Specifications A-3 119
- A-4 Technical Specifications 120
- Appendix B 121
- Related Documents 121
- B-2 Related Documents 122
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