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NETGEAR RangeMax™ NEXT Wireless Router WNR834B User Manual
Customizing Your Network Settings 4-7
v2.1, July 2007
Disabling the SPI Firewall
The Stateful Packet Inspection (SPI) Firewall protects your network and computers against attacks
and intrusions. A stateful packet firewall carefully inspects incoming traffic packets, looking for
known exploits such as malformed, oversized, or out-of-sequence packets. The firewall should
only be disabled in special circumstances, such as when troubleshooting application issues.
Setting Up a Default DMZ Server
The default DMZ server feature is helpful when using some online games and videoconferencing
applications that are incompatible with Network Address Translation (NAT). The router is
programmed to recognize some of these applications and to work properly with them, but there are
other applications that may not function well. In some cases, one local computer can run the
application properly if that computer’s IP address is entered as the default DMZ server.
Incoming traffic from the Internet is normally discarded by the router unless the traffic is a
response to one of your local computers or a service that you have configured in the Port
Forwarding/Port Triggering menu. Instead of discarding this traffic, you can have it forwarded to
one computer on your network. This computer is called the Default DMZ Server.
The WAN Setup menu lets you configure a Default DMZ Server.
To assign a computer or server to be a Default DMZ server:
1. In the main menu, under Advanced, click WAN Setup.
2. Under Default DMZ Server, type the last digit of the IP address for that computer. To remove
the default DMZ server, enter zero.
3. Select the checkbox for Default DMZ Server and click Apply.
Responding to a Ping on the Internet WAN Port
If you want the router to respond to a 'ping' from the Internet, select the checkbox for Respond to
Ping on Internet WAN Port. This should only be used as a diagnostic tool, since it allows your
router to be discovered by Internet scanners. Do not select this checkbox unless you have a
specific reason to do so, such as when troubleshooting your connection.
Warning: DMZ servers pose a security risk. A computer designated as the default DMZ
server loses much of the protection of the firewall, and is exposed to exploits
from the Internet. If compromised, the DMZ server computer can be used to
attack other computers on your network.
- NETGEAR RangeMax™ 1
- NEXT Wireless Router 1
- WNR834B User Manual 1
- WNR834B product package 3
- FCC Information to User 4
- FCC Declaration Of Conformity 5
- Contents 7
- About This Manual 11
- How to Use This Manual 12
- How to Print this Manual 12
- Revision History 13
- Chapter 1 15
- Figure 1-1 16
- Figure 1-2 17
- Figure 1-3 18
- Figure 1-4 18
- Figure 1-5 20
- Figure 1-6 22
- Figure 1-7 23
- Configuring Wireless Settings 24
- Figure 1-8 25
- Figure 1-9 27
- Figure 1-10 29
- Figure 1-11 30
- Chapter 2 31
- Safeguarding Your Network 31
- 2-2 Safeguarding Your Network 32
- Figure 2-1 32
- Recommended Security Settings 33
- 2-4 Safeguarding Your Network 34
- Figure 2-2 34
- Safeguarding Your Network 2-5 35
- 2-6 Safeguarding Your Network 36
- Safeguarding Your Network 2-7 37
- 2-8 Safeguarding Your Network 38
- Figure 2-3 38
- Wireless Security 39
- Figure 2-4 40
- Figure 2-5 41
- Figure 2-6 42
- Figure 2-7 42
- Backing Up Your Configuration 44
- Understanding Your Firewall 45
- Chapter 3 47
- Figure 3-1 48
- Figure 3-2 49
- Figure 3-3 50
- Scheduling Blocking 51
- Figure 3-5 52
- Field Description 53
- Figure 3-6 54
- Setting the Time 55
- Chapter 4 57
- Figure 4-1 58
- Using Address Reservation 60
- Using a Dynamic DNS Service 61
- Figure 4-3 62
- Disabling the SPI Firewall 63
- Configuring Static Routes 64
- Figure 4-5 65
- Figure 4-6 67
- Figure 4-7 68
- Chapter 5 71
- Fine-Tuning Your Network 71
- Through Your Router 72
- Fine-Tuning Your Network 5-3 73
- 5-4 Fine-Tuning Your Network 74
- Fine-Tuning Your Network 5-5 75
- 5-6 Fine-Tuning Your Network 76
- Adding a Custom Service 77
- 5-8 Fine-Tuning Your Network 78
- Figure 5-2 78
- Configuring Port Triggering 79
- 5-10 Fine-Tuning Your Network 80
- Figure 5-3 80
- Fine-Tuning Your Network 5-11 81
- Figure 5-4 81
- Using Universal Plug and Play 82
- Fine-Tuning Your Network 5-13 83
- 5-14 Fine-Tuning Your Network 84
- Fine-Tuning Your Network 5-15 85
- Figure 5-6 85
- 5-16 Fine-Tuning Your Network 86
- Fine-Tuning Your Network 5-17 87
- Figure 5-7 87
- Figure 5-8 87
- 5-18 Fine-Tuning Your Network 88
- Figure 5-9 88
- Fine-Tuning Your Network 5-19 89
- Figure 5-10 89
- Changing the MTU 90
- Fine-Tuning Your Network 5-21 91
- Table 5-1. Common MTU Sizes 91
- 5-22 Fine-Tuning Your Network 92
- Figure 5-11 92
- Technologies 93
- 5-24 Fine-Tuning Your Network 94
- Chapter 6 95
- Figure 6-1 96
- Figure 6-4 99
- Figure 6-5 100
- Erasing the Configuration 101
- Upgrading the Router Software 102
- Figure 6-7 103
- Figure 6-8 104
- Figure 6-9 105
- Chapter 7 107
- Troubleshooting 107
- 7-2 Troubleshooting 108
- Troubleshooting 7-3 109
- 7-4 Troubleshooting 110
- Troubleshooting 7-5 111
- 7-6 Troubleshooting 112
- Troubleshooting 7-7 113
- Problems with Date and Time 114
- Troubleshooting 7-9 115
- 7-10 Troubleshooting 116
- Figure 7-1 116
- Troubleshooting 7-11 117
- 7-12 Troubleshooting 118
- Figure 7-2 118
- Troubleshooting 7-13 119
- 7-14 Troubleshooting 120
- Appendix A 121
- Technical Specifications 121
- General Specifications 122
- Technical Specifications A-3 123
- A-4 Technical Specifications 124
- Appendix B 125
- Related Documents 125
- B-2 Related Documents 126
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