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RangeMax Wireless-N DSL Gigabit Modem Router DGN3500 User Manual
Advanced Configuration 5-3
v1.0, November 2009
Setting Up a Default DMZ Server
The default demilitarized zone (DMZ) server feature is helpful when you use some online games
and videoconferencing applications that are incompatible with NAT. The modem router is
programmed to recognize some of these applications and to work correctly with them, but there
are other applications that might not function well. In some cases, one local computer can run the
application correctly if that computer’s IP address is entered as the default DMZ server.
Incoming traffic from the Internet is usually discarded by the modem router unless the traffic is a
response to one of your local computers or a service that you have configured in the Ports screen.
Instead of discarding this traffic, you can have it forwarded to one computer on your network. This
computer is called the default DMZ server.
To assign a computer or server to be a default DMZ server:
1. Log in to the modem router at its default LAN address of http://192.168.0.1 with its default
user name of admin and default password of password, or using whatever user name,
password, and LAN address you have chosen for the modem router.
2. In the main menu, under Advanced, click WAN Setup to display the following screen.
3. On the WAN Setup screen, select the Default DMZ Server check box.
4. Type the IP address for that server.
5. Click Apply to save your changes.
MTU Size (in bytes) The normal MTU (Maximum Transmit Unit) value for most Ethernet networks
is 1500 bytes, or 1492 Bytes for PPPoE connections. For some ISPs you
might need to reduce the MTU. This is rarely required, and should not be done
unless you are sure it is necessary for your ISP connection. See “Changing
the MTU Size” on page 7-6.
Disable SIP ALG The Session Initiation Protocol (SIP) Application Level Gateway (ALG) is
enabled by default to optimize VoIP phone calls that use the SIP. The Disable
SIP ALG check box allows you to disable the SIP ALG. Disabling the SIP ALG
might be useful when running certain applications.
Note: For security reasons, you should avoid using the default DMZ server feature. When
a computer is designated as the default DMZ server, it loses much of the protection
of the firewall, and is exposed to many exploits from the Internet. If compromised,
the computer can be used to attack your network.
Table 5-1. WAN Setup Settings
Setting Description
- RangeMax Wireless-N DSL 1
- Gigabit Modem Router 1
- DGN3500 User Manual 1
- Contents 6
- About This Manual 10
- How to Print This Manual 11
- Revision History 11
- Chapter 1 12
- Figure 1-1 13
- Figure 1-2 14
- Figure 1-3 14
- Using the Setup Wizard 15
- Figure 1-5 16
- Configuring ADSL Settings 19
- Chapter 2 20
- Wireless Security Options 22
- Figure 2-1 23
- Figure 2-2 28
- Configuring WEP 30
- Configuring WPA-802.1x 31
- Figure 2-4 33
- Figure 2-5 35
- Adding More WPS Clients 36
- Figure 2-6 37
- Chapter 3 39
- Protecting Your Network 39
- 3-2 Protecting Your Network 40
- Figure 3-1 40
- Figure 3-2 40
- Protecting Your Network 3-3 41
- Figure 3-3 41
- Blocking Sites 42
- Protecting Your Network 3-5 43
- Figure 3-4 43
- Firewall Rules 44
- Protecting Your Network 3-7 45
- Figure 3-5 45
- 3-8 Protecting Your Network 46
- Figure 3-6 46
- Protecting Your Network 3-9 47
- Figure 3-7 47
- 3-10 Protecting Your Network 48
- Protecting Your Network 3-11 49
- Figure 3-8 49
- Order of Precedence for Rules 50
- Services 51
- 3-14 Protecting Your Network 52
- Figure 3-10 52
- Figure 3-11 52
- Setting Your Time Zone 53
- Scheduling Firewall Services 54
- Protecting Your Network 3-17 55
- Figure 3-13 55
- 3-18 Protecting Your Network 56
- Chapter 4 57
- Managing Your Network 57
- 4-2 Managing Your Network 58
- Figure 4-2 58
- Managing Your Network 4-3 59
- Figure 4-3 59
- 4-4 Managing Your Network 60
- Figure 4-4 60
- Managing Your Network 4-5 61
- Connection Status 62
- Statistics 63
- 4-8 Managing Your Network 64
- Figure 4-7 64
- Managing Your Network 4-9 65
- Figure 4-8 65
- Modem Router 66
- Managing Your Network 4-11 67
- Figure 4-10 67
- 4-12 Managing Your Network 68
- Chapter 5 69
- Advanced Configuration 69
- 5-2 Advanced Configuration 70
- Figure 5-1 70
- Advanced Configuration 5-3 71
- 5-4 Advanced Configuration 72
- Figure 5-2 72
- Advanced Configuration 5-5 73
- Table 5-2. LAN Setup 73
- Address Reservation 74
- Configuring LAN Setup 75
- 5-8 Advanced Configuration 76
- Figure 5-3 76
- Advanced Configuration 5-9 77
- Table 5-3. LAN Setup 77
- Dynamic DNS Service 79
- 5-12 Advanced Configuration 80
- Figure 5-4 80
- Setting up Static Routes 81
- Configuring Static Routes 82
- Advanced Configuration 5-15 83
- Figure 5-7 83
- 5-16 Advanced Configuration 84
- Figure 5-8 84
- Advanced Configuration 5-17 85
- 5-18 Advanced Configuration 86
- Figure 5-9 86
- Advanced Configuration 5-19 87
- Figure 5-10 87
- 5-20 Advanced Configuration 88
- Figure 5-11 88
- Advanced Configuration 5-21 89
- Chapter 6 90
- USB Storage 90
- USB Drive Requirements 91
- File Sharing Scenarios 91
- USB Storage 6-3 92
- USB Storage Basic Settings 93
- USB Storage 6-5 94
- Figure 6-3 94
- 6-6 USB Storage 95
- Editing a Network Folder 96
- 6-8 USB Storage 97
- Figure 6-5 97
- USB Storage 6-9 98
- Unmounting a USB Drive 99
- USB Storage 6-11 100
- Figure 6-7 100
- Settings 101
- USB Storage 6-13 102
- Troubleshooting 103
- Chapter 7 103
- Interface 104
- Power LED Is Not On 104
- Power LED Is Red 104
- 7-3 Troubleshooting 105
- ADSL Link 106
- Internet LED is Red 107
- Troubleshooting 7-6 108
- 7-7 Troubleshooting 109
- 7-9 Troubleshooting 111
- Problems with Date and Time 112
- Appendix A 113
- Technical Specifications 113
- Factory Default Configuration 114
- A-3 Technical Specifications 115
- Appendix B 116
- Related Documents 116
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