Common MTU sizes | NETGEAR DGND4000 specification

N750 Wireless Dual Band Gigabit ADSL Modem Router DGND4000

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 the 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 web-based applications might require an MTU change:

-A secure website that does not open, or displays only part of a web page

-Yahoo email

-MSN portal

-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 websites, frames within websites, secure login pages, or FTP or POP servers.

If you suspect an MTU problem, a common solution is to change the MTU to 1400. If you are willing to experiment, you can gradually reduce the MTU from the maximum value of 1500 until the problem goes away. The following table describes common MTU sizes and applications.

Table 11. Common MTU sizes

MTU	Application

1500	The largest Ethernet packet size and the default value. This is the typical setting for
	non-PPPoE, non-VPN connections, and is the default value for NETGEAR wireless
	modem routers, adapters, and switches.

1492	Used in PPPoE environments.

1472	Maximum size to use for pinging. (Larger packets are fragmented.)

1468	Used in some DHCP environments.

1460	Usable by AOL if you do not have large email attachments, for example.

1436	Used in PPTP environments or with VPN.

1400	Maximum size for AOL DSL.

576	Typical value to connect to dial up ISPs.

To change the MTU size:

1. Select ADVANCED > Setup > WAN Setup.

NETGEAR genie ADVANCED Home

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NETGEAR DGND4000 user manual  To change the MTU size Select Advanced Setup WAN Setup, Common MTU sizes

Contents

N750 WiFi DSL Modem Router Premium Edition Compliance SupportTrademarks Contents USB Printer Control Administration Appendix a Supplemental Information Hardware Setup Get to know your wireless router Product Specifications Weee Hardware Setup Box contents Unpack Your New Router Hardware Features Label Back Panel Back panel port connections Front Panel Front panel LEDs Wireless button GHz Wireless LED Position Your Wireless Router Power On/Off LED Adsl Microfilters One-Line Adsl Microfilter Not Included Two-Line Adsl Microfilter Included Cable Your N750 Wireless Modem RouterSummary Verify the Cabling Connect to Internet with Adsl or Ethernet WAN Get Started with Netgear genie Prepare to Set Up the Wireless Modem Router Types of Logins and AccessWireless Devices and Security Settings Use Standard TCP/IP Properties for Dhcp Netgear genie Setup  To use Netgear genie to set up your wireless modem routerBrowse to http//routerlogin.net  If the browser cannot display the web Use Netgear genie after Installation Upgrade Wireless Modem Router Firmware Wireless Modem Router Dashboard Basic Home Screen Add Wireless Devices or Computers to Your Network Wi-Fi Protected Setup WPS MethodManual Method  To connect manually  To use WPS to join the wireless network Netgear genie Basic Settings Your Internet connection and network Internet Basic Settings Screen Fields Internet Basic SettingsDoes Your ISP Require a Login? Answer either yes or no Attached Devices Internet IP Address Netgear genie Basic Settings Parental Controls USB Storage Basic Settings ReadySHARE USB Storage and Printer Basic Wireless Settings ReadySHARE Printer  To view or change basic wireless settings Wireless Settings Screen Fields Wireless Network Security Options Settings Change WPA Security Option and Passphrase  To set up a guest network Guest Networks Guest Network Wireless Security Options Netgear genie App  To install the genie mobile app Netgear genie Mobile App Specify custom settings Netgear genie Advanced Home Setup Wizard Select Setup Wizard Netgear genie Advanced Home  To use the WPS Wizard Select Advanced WPS Wizard WPS WizardSelect either Push Button or PIN Number VPN Wizard  To use the VPN Wizard Select Advanced VPN Wizard Netgear genie Advanced Home Setup Menu Adsl Setup Select Advanced Setup Adsl Settings WAN Setup Select Advanced Setup WAN Setup  To set up a default DMZ server Default DMZ ServerChange the MTU Size  To change the MTU size Select Advanced Setup WAN Setup Common MTU sizes LAN Setup  To change the LAN settings Select Advanced Setup LAN Setup LAN Setup Screen Settings Use the Wireless Modem Router as a Dhcp ServerLAN TCP/IP Setup Use Router as a Dhcp Server Address Reservation  To reserve an IP address Enable WMM QoS for Wireless Multimedia Applications Quality of Service SetupSelect Advanced Setup QoS Setup Set Up QoS for Internet Access QoS for Applications and Online Gaming To create a QoS policy for applications and online games Priority Rule Netgear genie Advanced Home QoS for a Wireless Modem Router LAN Port QoS for a MAC AddressClick the Add Priority Rule button Click Add Priority Rule Edit or Delete an Existing QoS Policy  To edit or delete a QoS policy Access and configure a USB storage drive USB Storage ReadySHARE Access USB Drive Requirements File-Sharing Scenarios Share PhotosStore Files in a Central Location for Printing  To share files with your friends and family USB Storage Basic Settings Share Large Files over the Internet  To access your USB device Add or Edit a Network Folder USB Storage Advanced Settings Safely Remove a USB Drive Available Network Folders Media Server Settings Specify Approved USB Devices Select the Allow only approved devices check box Connect to the USB Drive from a Remote ComputerFtp//10.1.65.4 Access and configure a USB printer USB Printer Control USB Printer Control Select Tools Configuration Control Center ConfigurationUSB Printer Scan with a Multifunction Printer Keep unwanted content out of your Security Keyword Blocking of Http Traffic Select Advanced Security Block Sites To delete a keyword or domain  To specify a trusted computer Firewall Rules Security Add Custom Services to Allow or Block  To add a custom service TCP UDP TCP/UDP Schedule for Firewall Rules Security Event Email Notifications Administration Manage your network Upgrade the Wireless Modem Router Firmware View Wireless Modem Router Status Router InformationInternet Port LAN Port Show Statistics Button System up time and poll interval statistics Wireless Settings 2.4 GHz and Wireless Settings 5 GHz Connection Status Button Guest Network 2.4 GHz and Guest Network 5 GHz Select Advanced Administration VPN Status View Logs of Web Access or Attempted Web AccessView VPN Status Manage the Configuration File Select Advanced Administration Logs Back Up Settings Restore Configuration Settings To restore configuration settings that you backed up Do not interrupt the reboot process Set Password Password Recovery Diagnostics Administration  To set up Time Machine Set Up Time MachineTime Machine Access the Connected USB Hard Drive  To access the drive Time Machine Before You Back Up a Large Amount of Data Administration Select Guid Partition Table or Master Boot Record MBR Select Volume SchemeChange the Partition Scheme Advanced Settings Fine-tuning your network Advanced Wireless Settings Select Advanced Advanced Setup Wireless Settings Advanced Settings 103 Advanced Settings 104 Wireless Repeating Function WDS Wireless repeating scenario Wireless Repeating Function Select Advanced Advanced Setup Wireless Repeating Function Set Up the Base Station  To set up the base station Set Up a Repeater Unit  To configure the wireless modem router as a repeater unit Remote Computer Access Basics Port Forwarding and Triggering Port Triggering to Open Incoming Ports Advanced Settings 111 Port Forwarding to Permit External Host Communications  To set up port forwarding Set Up Port Forwarding to Local ServersHow Port Forwarding Differs from Port Triggering Advanced Settings 114 Add a Custom Service Click the Add Custom Service buttonClick Edit Service or Delete Service Edit or Delete a Port Forwarding Entry Application Example Making a Local Web Server Public Set Up Port Triggering To make a local web server public Advanced Settings 117 Click Add Service Dynamic DNS Select the Use a Dynamic DNS Service check box  To set up Dynamic DNSStatic Routes  To set up a static route Advanced Settings 121 Remote Management USB Settings Universal Plug and Play Advanced Settings 124 IPv6 Traffic Meter Advanced Settings 126 Device Mode VPN Policies Advanced Settings 128 Add or Edit an Auto VPN Policy IKE Fully Qualified Domain Name. Your domain name Parameters Add or Edit a Manual VPN Policy Advanced Settings 133 Troubleshooting Diagnose and solve problems Wireless Settings Network SettingsQuick Tips Sequence to Restart Your Network Power LED Stays Red Power LED Is Off or BlinkingTroubleshoot with the LEDs Wireless LEDs Are Off LEDs Never Turn OffInternet or Ethernet Port LEDs Are Off Push N Connect WPS Button Blinks Green Cannot Access the Internet Cannot Log In to the Router Troubleshooting 139 Troubleshoot Internet Browsing Troubleshoot PPPoE To troubleshoot a PPPoE connection Changes Not Saved Wireless ConnectivityIncorrect Date or Time Restore the Factory Settings and Password Troubleshoot Your Network Using the Ping UtilityWireless Signal Strength Test the LAN Path to Your Router Test the Path from Your Computer to a Remote Device Troubleshooting 144 Specifications Supplemental Information Factory Settings Factory default settings Supplemental Information 147 Technical Specifications DGND4000 Router specifications Supplemental Information 149 Index 150 151 152 153