NETGEAR DGND3300 Changing the MTU Size

RangeMax Dual Band Wireless-N Modem Router DGND3300 User Manual

6-6 Fine-Tuning Your Network

v1.0, March 2009

• Microwave ovens (no closer than 10 feet)

• Choose your settings.

– Use a scanning utility to determine what other wireless networks are operating nearby, and

choose an unused channel.

– Turn off SSID broadcast, and change the default SSID. Other nearby devices might

automatically try to connect to your network several times a second, which can cause

significant performance reduction.

• Use WMM to improve the performance of voice and video traffic over the wireless link.

Changing the MTU Size

The Maximum Transmission Unit (MTU) is the largest data packet a network device transmits.

When one network device communicates across the Internet with another, the data packets travel

through many devices along the way. If any device in the data path has a lower MTU setting than

the other devices, the data packets must be split or “fragmented” to accommodate the one with the

smallest MTU.

The best MTU setting for NETGEAR equipment is often just the default value, and changing the

value might fix one problem but cause another. Leave MTU unchanged unless one of these

situations occurs:

• You have problems connecting to your ISP or other Internet service, and the technical support

of either the ISP or NETGEAR recommends changing the MTU setting. These might require

an MTU change:

– A secure website that won’t open, or displays only part of a Web page

–Yahoo e-mail

–MSN

– America Online’s DSL service

• You use VPN and have severe performance problems.

• You used a program to optimize MTU for performance reasons, and now you have

connectivity or performance problems.

Note: An incorrect MTU setting can cause Internet communication problems such as the

inability to access certain Web sites, frames within Web sites, secure login pages,

or FTP or POP servers.

Contents

Main Regulatory Compliance Information iii Europe EU Declaration of Conformity iv FCC Requirements for Operation in the United States FCC Information to User FCC Guidelines for Human Exposure v FCC Declaration Of Conformity Maximum Wireless Signal Rate Derived from IEEE Standard 802.11 Specifications RangeMax Dual Band Wireless-N Modem Router Product and Publication Details Contents Page Page Page About This Manual Conventions, Formats, and Scope How to Use This Manual How to Print This Manual Revision History Page Chapter 1 Configuring Your Internet Connection Using the Setup Manual Logging In to Your Modem Router Page Using the Setup Wizard Viewing or Manually Configuring Your ISP Settings The following table explains the fields in the Basic Settings screen. Configuring Your Internet Connection 1-7 Table1-1. Basic Settings screen fields Configuring ADSL Settings Note: For information about how to install ADSL filters, see the Setup Manual. 1-8 Configuring Your Internet Connection Table1-1. Basic Settings screen fields (continued) Page Page Chapter 2 Safeguarding Your Network Planning Your Wireless Network certified and WPA or WPA2 capable, and that they support WPS configuration. Wireless Placement and Range Guidelines Wireless Security Options Manually Configuring Your Wireless Settings Safeguarding Your Network 2-5 Table2-1. Wireless Settings Configuring WEP Wireless Security Page Configuring WPA, WPA2, or Mixed WPA2 + WPA Wireless Security Page Using Push 'N' Connect (WPS) to Configure Your Wireless Network Using a WPS Button to Add a WPS Client Using PIN Entry to Add a WPS Client Configuring Advanced WPS Settings Connecting Additional Wireless Client Devices After WPS Setup Adding More WPS Clients Adding Both WPS and Non-WPS Clients Restricting Access to Your Modem Router Page Page Chapter 3 Protecting Your Network Protecting Access to Your Modem Router Changing the Built-In Password Restricting Access by MAC Address Page Blocking Access to Internet Sites Page Firewall Rules Page 3-8 Protecting Your Network Blocking Access to Internet Services Table3-1. Adding or Editing Firewall Service Rules (continued) Page Scheduling Blocking Viewing Logs of Web Access or Attempted Web Access Configuring E-mail Alert and Web Access Log Notifications Setting the Time Page Chapter 4 Using Network Monitoring Tools Upgrading the Firmware Manually Checking for Firmware Upgrades Page Viewing Modem Router Status Information Using Network Monitoring Tools 4-5 Table4-1. Modem Router Status Fields Connection Status To view the connection status, on the Router Status screen, click Connection Status. The following table describes the connection status settings. Statistics The following table describes the modem router statistics. To view statistics, on the Router Status screen, click Show Statistics. Viewing a List of Attached Devices Managing the Configuration File Backing Up and Restoring the Configuration Erasing the Configuration Running Diagnostic Utilities and Rebooting the Modem Router Enabling Remote Management Access Page Page Chapter 5 Customizing Your Network Settings Using the LAN Setup Options Page Customizing Your Network Settings 5-3 Table5-1. LAN Setup Using the Modem Router as a DHCP Server Address Reservation Using a Dynamic DNS Service Page Customizing Your Network Settings 5-7 Configuring the WAN Setup Options The WAN Setup fields are described in the following table: Figure 5-3 Table5-2. WAN Setup Settings Setting Up a Default DMZ Server Setting up Quality of Service (QoS) Configuring QoS for Internet Access Page Page Page Editing or Deleting an Existing QoS Policy Configuring Static Routes Page Wireless Repeating (Also Called WDS) Wireless Repeating Function Setting Up the Base Station Setting Up a Repeater Unit Page Chapter 6 Fine-Tuning Your Network Assessing Your Speed Requirements Optimizing Your Network Bandwidth Page Optimizing Wireless Performance Changing the MTU Size Universal Plug and Play Page Chapter 7 Troubleshooting Quick Tips Troubleshooting with the LEDs Troubleshooting 7-3 The Wireless LEDs are lit. If any of the above conditions does not occur, see the following table. Table7-2. Troubleshooting with the LEDs Cannot Access the Router Menu Cannot Access the Internet Checking the Configuration Checking the WAN IP Address Page Troubleshooting a Network Using the Ping Utility Testing the LAN Path to Your Router Testing the Path from Your Computer to a Remote Device Problems with Date and Time Wireless Connectivity Viewing Available Networks Appendix A Default Configuration and Technical Specifications Restoring the Factory Configuration Settings Using the Restore Factory Settings Button A-2 Default Configuration and Technical Specifications TableA-1. Default Configuration Settings Technical Specifications Default Configuration and Technical Specifications A-3 TableA-1. Specifications TableA-1. Default Configuration Settings (continued) Page Appendix B Related Documents In addition, you can find initial setup instructions for your modem router in the Setup Manual. Page Index-1 Index A B C D E F G H I N O P Q R T U V W