Change the MTU Size, Application | NETGEAR D500 and D1500 instruction

N150 and N300 WiFi DSL Modem Routers

Leave the MTU unchanged unless one of these situations occurs:

•You experience 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 experience severe performance problems.

•You used a program to optimize MTU for performance reasons and now you are experiencing connectivity or performance problems.

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 2. Common MTU sizes

MTU	Application

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

Change the MTU Size

WARNING:

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. Change the MTU only if you are sure that it is necessary for your ISP connection.

Manage the Internet Settings Manually

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NETGEAR D500 and D1500 user manual Change the MTU Size, Application

Contents

N150 WiFi DSL Modem Router-Essentials Edition Compliance SupportTrademarks Contents Manage the WiFi Network Settings Appendix a Supplemental Information Router Unpack Your Modem Router Your package contains the following items Top Panel with LEDs Following table describes the LEDs from right to left Adsl Bottom Panel Product Label Modem router product label Install and Access the Modem Router and Its Network Position Your Modem Router Types of Logins Wired ConnectionWiFi Connection Before You Connect to the Modem Router Netgear genie Automatic Setup Utility and Setup Wizard Set Up Your Modem Router for DSL Service DSL Service  To connect your modem router to a DSL service Modem router cabling for DSL service Install and Access the Modem Router and Its Network Set Up Your Modem Router for Cable or Fiber Service  To connect your modem router to a cable or fiber service Modem router cabling for cable or fiber service Install and Access the Modem Router and Its Network WAN physical interface changing. Please wait Install and Access the Modem Router and Its Network  To log in to the modem router Change the Language Change the admin Password and Automatic Login Time-Out To change the password for the user name admin  To change the language Install and Access the Modem Router and Its Network Manage the Internet Settings Manually Use the Internet Setup Wizard After Initial Setup  To use the Setup Wizard Manage the Internet Settings Manually Manually Set Up the Internet Connection Specify an Internet Connection Without a Login Field Description Internet IP Address Router MAC Address Domain Name Server DNS AddressNAT Network Address Translation Manage the Internet Settings Manually From the Encapsulation menu, select PPPoE PPP over Ethernet Or Manually Connect Manage the Internet Settings Manually From the Encapsulation menu, select PPPoA PPP over ATM IPv6 Internet Connections and IPv6 Addresses Specify an IPv6 Internet ConnectionField Description Internet IP Address Set Up an IPv6 6to4 Tunnel Connection Manage the Internet Settings Manually Set Up an IPv6 Fixed Connection Set Up an IPv6 Pass-Through Connection To set up an IPv6 pass-through Internet connection  To set up a fixed IPv6 Internet connection Set Up an IPv6 Dhcp Connection  To set up an IPv6 Internet connection with a Dhcp server Manage the Internet Settings Manually Set Up an IPv6 PPPoE Connection  To set up an IPv6 PPPoE Internet connection Manage the Internet Settings Manually Manage the MTU Size MTU Concepts Change the MTU Size Application  To change the MTU size Manage the WiFi Network Settings Manage the Basic WiFi Settings and WiFi Security Field Description Wireless Network N150 WiFi DSL Modem Router Model N300 WiFi DSL Modem Router Model D1500 Field Description Security Options Configure WPA/WPA2 Enterprise WiFi Security  To configure WPA/WPA2 enterprise security Configure WEP Legacy WiFi Security  To configure WEP security Manage the WiFi Network Settings Manage the WiFi Radio  To manage the WiFi radio Manage Advanced WiFi Features  To manage advanced WiFi features Set Up the Modem Router as a Wireless Repeater Transmit Power Control menu Following figure shows a wireless repeating scenario Select the Enable Wireless Repeating Function check box Settings Manage the Adsl Settings  To view or change the DSL setup Manage the WAN and LAN Network Settings Manage the WAN and LAN Network Settings Manage the WAN Security Settings  To change the default WAN security settings Manage Igmp Proxying and VPN Pass-Through  To change the default NAT filtering settings Manage NAT Filtering Manage the WAN and LAN Network Settings  To change the default ALG settings Manage the Application Level Gateway Manage the Modem Router’s LAN IP Address  To change the LAN TCP/IP settingsLAN IP address Change the Modem Router’s Device Name  To change the router’s device name Manage the Dhcp Server Address Pool Disable the Built-In Dhcp Server  To disable the built-in Dhcp server Set Up and Manage Static Routes Clear the Use Router as Dhcp Server check box Set Up a Static Route  To set up a static route Field Description  To change a static route Change a Static RouteRemove a Static Route  To remove a static route Manage Universal Plug and Play To manage Universal Plug and Play Manage the WAN and LAN Network Settings Manage the Modem Router Monitor the Traffic Update the Firmware of the Modem Router  To check for new firmware and update your modem router Manually Check for New Firmware and Update the Modem Router D1500-V1.0.0.141.0.1PE.img Back Up the Settings Manage the Configuration File of the Modem Router To back up the modem router’s configuration settings Restore the Settings  To restore configuration settings that you backed up Use the Reset Button Return the Modem Router to Its Factory Default Settings To reset the modem router to factory default settings Erase the Settings  To erase the settings View the Status and Statistics of the Modem Router Field Description Router Information Internet Port Wireless SettingsModem View the Traffic Statistics Field or Column Description View or Change a PPPoE or PPPoA Internet Connection View or Change a TCP/IP Internet Connection  To view or change the TCP/IP Internet connection status View the xDSL Line Status and Modem Statistics  To view modem router status Manage the Modem Router and Monitor the Traffic  To display the wired and WiFi devices View Devices Currently on the Network Product label Troubleshooting Quick Tips for Troubleshooting Problem Possible Solution WiFi LED Is Off Power LED Is OffTroubleshoot with the LEDs You Cannot Log In to the Modem Router LAN LED Is Off Troubleshoot the Internet Connection Troubleshoot the DSL Link Obtain an Internet IP Address Internet LED Is Off To check the Internet IP address Troubleshoot PPPoE or PPPoA  To verify that your PPPoE or PPPoA connection is working Troubleshoot Internet Browsing Troubleshoot the WiFi Connectivity Changes Are Not Saved  To ping the modem router from a Windows computer Troubleshoot Your Network Using the Ping UtilityTest the LAN Path to Your Modem Router Ping Test the Path from Your Computer to a Remote Device Supplemental Information Factory Settings Feature Default Behavior Technical and Environmental Specifications Feature Description Supplemental Information 114