NETGEAR WNDR3700V4 user manual Change the MTU Size, Common MTU sizes

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N600 Wireless Dual Band Gigabit Router WNDR3700v4

Change 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 a device in the data path has a lower MTU setting than the other devices, the data packets are split or “fragmented” to accommodate the device with the smallest MTU.

The best MTU setting for NETGEAR equipment is often just the default value. In some situations, changing the value fixes one problem but causes 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. For example, you might not be able 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 1. Common MTU sizes

MTU	Application

1500	The largest Ethernet packet size and the default value. This setting is typical for
	connections that do not use PPPoE or VPN, and is the default value for NETGEAR
	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..

NETGEAR genie Advanced Home

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Contents October 2013 East Plumeria Drive San Jose, CA N600 Wireless Dual Band Gigabit Router WNDR3700v4Support Contents Netgear genie Advanced Home Advanced Settings Appendix a Supplemental Information Getting to know your router Hardware SetupHardware Features Unpack Your RouterFront Panel Icon Description Label Back PanelPosition Your Router Attach the StandCable Your Router Verify the Cabling N600 Wireless Dual Band Gigabit Router WNDR3700v4 Getting Started with Netgear Genie Connecting the routerUse Standard TCP/IP Properties for Dhcp Router Setup PreparationTypes of Logins and Access Wireless Devices and Security SettingsUpgrade the Firmware Use Netgear genie after InstallationBasic Home screen with dashboard, language, and online help Dashboard Basic Home ScreenManual Method Join Your Wireless NetworkWi-Fi Protected Setup WPS Method  To use WPS to join the wireless networkNetgear genie App and Mobile genie App Your Internet connection and network Netgear genie Basic SettingsInternet Setup  To view or change the basic Internet setupBasic Home Screen Internet Setup Screen Fields Does Your ISP Require a Login? Answer either yes or noInternet IP Address  To go to the Attached Devices screen Attached DevicesParental Controls  To set up Live Parental ControlsN600 Wireless Dual Band Gigabit Router WNDR3700v4 Click the Take me to the status screen button ReadySHARE Storage To view or change basic wireless settings Basic Wireless SettingsWireless Settings Screen Fields Wireless Network 2.4 GHz b/g/n and 5 GHzRegion Selection Change WPA Security Option and Password Security Options Settings To change the WPA settings Guest Networks  To set up a guest network Select Basic Guest NetworkWPA Encryption Guest Network Wireless Security OptionsNetgear genie Advanced Home Specify custom settingsSetup Wizard  To use the Setup WizardNetgear genie Advanced Home Screen WPS Wizard  To use the WPS Wizard Select Advanced WPS WizardSelect either Push Button or PIN Number Setup Menu WAN Setup  To set up a default DMZ server Default DMZ ServerCommon MTU sizes Change the MTU SizeLAN Setup  To change the MTU size Select Advanced Setup WAN Setup To change the LAN settings LAN Setup Screen Settings LAN TCP/IP SetupUse Router as a Dhcp Server Use the Router as a Dhcp Server Address ReservationAddress Reservation  To reserve an IP address Quality of Service QoS SetupEnable WMM QoS for Wireless Multimedia Applications  To configure QoSSet Up QoS for Internet Access QoS for Applications and Online Gaming To create a QoS policy for applications and online games Select the Turn Internet Access QoS On check box QoS for a Router LAN PortClick the Add Priority Rule button Click Add Priority Rule  To edit or delete a QoS policy Select Advanced QoS SetupQoS for a MAC Address Edit or Delete an Existing QoS PolicyStorage Accessing and configuring a USB storageShare Photos ReadySHARE Access To access the USB device from Windows File-Sharing ScenariosStore Files in a Central Location for Printing Share Large Files over the Internet To share files with your friends and family Storage Basic Settings  To go to Storage Basic Settings Select Basic ReadySHARE To access your USB device Select Basic ReadySHARE, and click Edit Add or Edit a Network Folder To go to USB Storage Advanced Settings Storage Advanced SettingsSafely Remove a USB Drive Media ServerAvailable Network Folders Select the Allow only approved devices check box Specify Approved USB DevicesFtp//10.1.65.4 Access the Router USB Drive Remotely Using FTP To connect to the router’s USB drive using a web browser Connect to the USB Drive from a Remote ComputerSecurity Keep unwanted content out of your network To specify a trusted computer Keyword Blocking of Http TrafficSelect Advanced Security Block Sites  To delete a keyword or domain To block services Select Advanced Security Block Services Block Services Port FilteringN600 Wireless Dual Band Gigabit Router WNDR3700v4  To schedule blocking Schedule BlockingSecurity Event Email Notifications Manage your network Administration To check for new firmware and update your router LAN Port View Router StatusRouter Information Hardware Version. The router modelShow Statistics Button Internet PortView connection status information Connection Status ButtonWireless Settings 2.4 GHz and 5 GHz View Logs of Web Access or Attempted Web Access Erase Manage the Configuration FileBack Up Settings Restore Configuration SettingsPassword Recovery Set PasswordCustomize your network Advanced SettingsAdvanced Wireless Settings  To restrict access based on MAC addresses Restrict Wireless Access by MAC AddressSelect the Turn Access Control On check box Wireless APSelect the Enable Access Point Mode check box Wireless Repeating Function WDSWireless repeating scenario Following settings are available  To view or change the Wireless Repeating Function settings To set up the base station Set Up the Base Station To configure the router as a repeater unit Set Up a Repeater UnitPort Forwarding and Port Triggering Remote Computer Access BasicsDestination port number Port Triggering to Open Incoming PortsPort Forwarding to Permit External Host Communications How Port Forwarding Differs from Port Triggering  To set up port forwarding Set Up Port Forwarding to Local ServersAdd a Custom Service Edit or Delete a Port Forwarding Entry To edit or delete a port forwarding entry  To make a local web server public Set Up Port TriggeringClick Edit Service or Delete Service Application Example Making a Local Web Server PublicN600 Wireless Dual Band Gigabit Router WNDR3700v4  To set up Dynamic DNS Select the Use a Dynamic DNS Service check boxDynamic DNS Static Routes  To set up a static route Remote Management USB Settings Universal Plug and Play To turn on Universal Plug and Play IPv6  To set up an IPv6 Internet connection typeIPv6 LAN Setup Auto Detect FieldsIPv6 Filtering Auto Config Pass Through 6to4 TunnelIPv6 Fixed WAN Setup IPb6 Fixed LAN SetupFixed Dhcp PPPoE Traffic Meter Troubleshooting Quick Tips Power LED Is Off or Blinking Troubleshoot with the LEDsLEDs Never Turn Off Wireless 2.4 GHz and 5 GHz LEDs Are Off Cannot Log In to the RouterInternet LED Is Off Cannot Access the Internet Wireless Connectivity Changes Not SavedIncorrect Date or Time Wireless Signal Strength Supplemental Information Factory default settings Factory SettingsWPA2-PSK AES Technical Specifications111 Notification of Compliance Netgear Dual Band WirelessFCC Caution Avertissement Important Note Radiation Exposure Statement

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