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Section 5 - 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.

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Contents Page Preface Manual RevisionsTrademarks DescriptionTable of Contents Troubleshooting WarrantyRegistration IiiProductPackageOverviewContents System Requirements Computer with the followingBrowser Requirements Introduction Total PerformanceFeatures Your specific settings within minutesHardware Overview ConnectionsLEDs TransmissionInstallation Before you BeginWireless Installation Considerations Configuration Quick Router Setup Wizard CDQRS Mobile App Configuration Quick Setup Wizard Configuration Configuration Configuration Configuration Configuration Web-based Configuration Utility Internet Connection Setup Manual Internet Configuration Setup and skip to the nextManual Internet Setup Static IPService Dynamic IPPPPoE DSL Select either Always-on,On-Demand, or ManualPptp L2TP DS-Lite Aftr IPv6 Address B4 IPv4 AddressWireless Settings Manual Wireless Settings Wireless Security What is WPA?Wireless Network Setup Wizard Configuration Configure WPA-Personal PSK Click on Manual Wireless Connection SetupConfigure WPA-Enterprise Radius Next to Security Mode, select WPA-EnterpriseConfiguration Add Wireless Device with WPS Wizard WPSConfiguration Network Settings Router SettingsDhcp Server Settings NetBIOS ScopeDhcp Reservation ClientsUSB Settings Connectivity Setup button IPV6IPv6 Internet Connection Setup Wizard Configuration IPv6 over PPPoE Length AddressDNS Address Tunneling Connection 6rd IPv6 Manual Setup Auto DetectionStatic IPv6 Autoconfiguration LifetimePPPoE Lifetime Settings IPv6 in IPv4 TunnelingConnection DNS Address 6rd Link-Local Connectivity Advanced Virtual ServerSchedules section Port Forwarding Application Rules QoS Engine SpeedNetwork Filters Access Control Access Control WizardConfiguration Configuration Website Filters Inbound Filters Action Select Allow or DenyFirewall Settings Application Level Gateway Configuration Routing Advanced Wireless Settings Transmit Power Set the transmit power of the antennasWish Settings Enable WishAutomatic Wish Rules Wi-Fi Protected Setup WPS Add Wireless StationAdvanced Network Settings Guest Zone IPv6 Firewall FirewallAddress Range field IPv6 Routing Administrator Settings ToolsTime Settings Time Zone Select the Time Zone from the drop-down menuSysLog Check this box to send the router logs to a SysLog ServerEmail Settings Authentication authenticationSystem Settings Update Firmware Firmware UpgradeDdns System Check Schedules Wireless LAN StatusDevice Information GeneralView Levels Apply Log Settings Refresh LogSave Log Stats Active SessionsRouting Wireless IPV6 Support Connect to a Wireless Network Connecting to a Wireless NetworkWPS Button Windows Connecting to a Wireless Network Connecting to a Wireless Network Windows Vista Configure Wireless Security Connect to a networkConnecting to a Wireless Network Using Windows XP View Available Wireless Networks 100 Troubleshooting Why can’t I access the web-based configuration utility?101 What can I do if I forgot my password? 102Ping url -f -l MTU value 103 104 Wireless Basics Appendix a Wireless Basics105 Home Small Office and Home Office106 Centralize your router or Access Point Eliminate InterferenceSecurity 107Wireless Modes 108Networking Basics Check your IP addressAppendix B Networking Basics 109Step 110Technical Specifications Contacting Technical Support Appendix D Contacting Technical Support112 GNU General Public License Appendix E GNU General Public License113 Definitions Source Code114 Basic Permissions 115Conveying Verbatim Copies Conveying Modified Source Versions116 Conveying Non-Source Forms 117Additional Terms 118119 Appendix E GNU General Public License Termination Acceptance Not Required for Having CopiesAutomatic Licensing of Downstream Recipients 120Patents 121No Surrender of Others Freedom Use with the GNU Affero General Public LicenseRevised Versions of this License 122Disclaimer of Warranty Limitation of LiabilityInterpretation of Sections 15 123Warranty Appendix F Warranty124 Submitting a Claim 125What Is Not Covered 126Limitation of Liability 127FCC Caution FCC Radiation Exposure Statement128 Industry Canada Statement Radiation Exposure Statement129 Registration Appendix G Registration130
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DIR-655, DIR-655 specifications

The D-Link DIR-655 is a widely recognized wireless router that has made a significant mark in the realm of home networking since its initial release. Known for its combination of high performance, advanced features, and ease of use, the DIR-655 is primarily designed for users looking for reliable internet connectivity with added functionalities.

One of the standout features of the D-Link DIR-655 is its capability to operate on dual-band frequencies – 2.4 GHz and 5 GHz. This dual-band support allows users to experience reduced interference and improved wireless performance. The 2.4 GHz band is ideal for basic tasks such as web browsing and email, while the 5 GHz band excels in handling high-bandwidth applications like HD video streaming and online gaming.

Equipped with advanced 802.11n wireless technology, the DIR-655 ensures an extensive range and faster speeds, making it suitable for households with multiple devices. The Wireless N technology provides data transfer speeds of up to 300 Mbps, enhancing connectivity for streaming content, downloading files, and engaging in online gaming without noticeable lag.

Moreover, the router features multiple Ethernet ports, accommodating wired connections for devices that require a stable internet connection, such as gaming consoles and desktop computers. This versatility ensures that users can seamlessly connect devices while benefitting from minimal latency.

Security is a primary concern for any network, and the DIR-655 addresses this with robust security features. It employs WPA/WPA2 encryption protocols to safeguard the network against unauthorized access and potential threats. The built-in firewall adds an extra layer of protection, keeping your data safe from external vulnerabilities.

Setting up the DIR-655 is straightforward, thanks to its user-friendly web interface. The D-Link Quick Setup Wizard guides users through the installation process, ensuring that even those with limited technical knowledge can configure the router with ease.

Additionally, the DIR-655 offers Quality of Service (QoS) settings, allowing users to prioritize bandwidth allocation according to their needs. This feature is particularly useful in busy households where multiple users are engaged in high-bandwidth activities simultaneously.

In summary, the D-Link DIR-655 is an exceptional choice for those seeking a reliable and feature-rich wireless router. Its dual-band technology, high data transfer speeds, fortified security measures, and user-friendly setup make it a formidable ally in the quest for seamless internet connectivity. Whether for casual browsing or intensive online activities, the DIR-655 continues to meet the diverse needs of modern users.
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