D-Link DIR-825 manual Troubleshooting

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Section 6 - Troubleshooting

You should start at 1472 and work your way down by 10 each time. Once you get a reply, go up by 2 until you get a fragmented packet. Take that value and add 28 to the value to account for the various TCP/IP headers. For example, lets say that 1452 was the proper value, the actual MTU size would be 1480, which is the optimum for the network we’re working with (1452+28=1480).

Once you find your MTU, you can now configure your router with the proper MTU size.

To change the MTU rate on your router follow the steps below:

•Open your browser, enter the IP address of your router (192.168.0.1) and click OK.

•Enter your username (admin) and password (blank by default). Click OK to enter the web configuration page for the device.

•Click on Setup and then click Manual Configure.

•To change the MTU enter the number in the MTU field and click Save Settings to save your settings.

•Test your email. If changing the MTU does not resolve the problem, continue changing the MTU in increments of ten.

D-Link DIR-825 User Manual

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Contents Page Preface Manual RevisionsTrademarks Revision Date DescriptionTable of Contents Wireless Security RegistrationProductPackageOverviewContents System Requirements Computer with the followingBrowser Requirements Utility RequirementsIntroduction Total PerformanceFeatures Hardware Overview ConnectionsPower LED LEDsInternet LED Status LEDInstallation Before you BeginWireless Installation Considerations Connect to Cable/DSL/Satellite Modem Connect to Another Router Installation Click Install Router Getting StartedConfiguration Web-based Configuration UtilitySetup Wizard Click Launch Internet Connection Setup Wizard to beginConfiguration Configuration Configuration Manual Internet Connection Setup Click Manual Internet Connection Setup to beginDynamic Cable Host NamePrimary ServerConnection Internet SetupPPPoE DSL Pptp ManualPage Reconnect Mode Select either Always-on,On-Demand, or Manual L2TPPage Static assigned by ISP Wireless Settings Manual Wireless Settings 802.11n/g 2.4GHzPage 802.11n/a 5GHz Page Network Settings Router SettingsDhcp Server Settings Dhcp Reservation Virtual Server Configuration Port Forwarding Application Rules QoS Engine SpeedPage Network Filters Access Control Access Control WizardAccess Control Wizard Access Control Wizard Website Filters Add Website Select Allow or Deny Filtering RuleInbound Filters Enable DMZ Firewall SettingsEnable SPI NAT Endpoint Filtering Routing Advanced Wireless Settings Transmit Power Set the transmit power of the antennas802.11n/a 5GHz Wish Settings Page Wi-Fi Protected Setup WPS Reset PIN toStation Device WizardAdvanced Network Settings Enable UPnP WAN PingSchedule Security ModeGuest Zone Administrator Settings Time Settings SysLog SysLog Server SysLog ServerEmail Settings Authentication authenticationSystem Settings Update Firmware Check Email Notification of Newer FirmwareDdns System Check Schedules Device Information Log Statistics Internet Sessions Wireless WishSupport Wireless Security What is WPA?Wireless Security Setup Wizard Security Add Wireless Device with WPS Wizard Configure WPA-Personal PSK Next to Security Mode, select WPA-PersonalConfigure WPA-Enterprise Radius Next to Security Mode, select WPA-EnterpriseSecurity Connect to a Wireless Network Using Windows VistaConfigure Wireless Security Connecting to a Wireless Network Connect Using WCN 2.0 in Windows Vista Using Windows XP Configure WPA-PSK Connecting to a Wireless Network Troubleshooting Why can’t I access the web-based configuration utility?What can I do if I forgot my password? Troubleshooting Troubleshooting Wireless Basics What is Wireless? Wireless Local Area Network WlanSmall Office and Home Office Wireless Personal Area Network WpanHome Centralize your router or Access Point Eliminate InterferenceWireless Modes SecurityNetworking Basics Check your IP addressStatically Assign an IP address StepTechnical Specifications Contacting Technical Support For customers within the United StatesWarranty Limited WarrantySubmitting a Claim Limited Software WarrantyNon-Applicability of Warranty What Is Not Covered Disclaimer of Other WarrantiesLimitation of Liability Governing LawTrademarks Copyright StatementCE Mark Warning FCC StatementFCC Caution FCC Radiation Exposure StatementRèglement d’Industry Canada ICC NoticeIC Radiation Exposure Statement Registration