NETGEAR C6300 user manual Change the MTU Size,  To change the MTU size

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AC1750 WiFi Cable Modem Router

•Disable SIP ALG. Some VoIP applications do not work well with the SIP ALG. Selecting this check box to turn off the SIP ALG might help your VoIP devices to create or accept a call through the modem router.

6.Click the Apply button. Your changes are saved.

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 uses a lower MTU setting than the other devices, the data packets must be split or “fragmented” to accommodate the device with the smallest MTU.

The best MTU setting for NETGEAR equipment is often 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 experience problems connecting to the Internet, and the technical support of either the Internet provider 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.

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.

To change the MTU size:

1.Launch a web browser from a computer or wireless device that is connected to the network.

2.Type http://routerlogin.net or http://192.168.0.1. A login screen displays.

3.Enter the modem router user name and password.

Specify Network Settings

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Contents AC1750 WiFi Cable Modem Router Support ComplianceTrademarks Contents Specify Network Settings Appendix a Supplemental Information Hardware Setup Front Panel Unpack Your Modem RouterLED Position Your Modem Router Rear Panel To retrieve the product label from the modem router Retrieve and Display the Product LabelCable the Modem Router in a Simple Network Cable Your Modem RouterCable Your Modem Router to a Router or Gateway  To cable your modem router To cable your modem router to a gateway or router Select Advanced Administration Router Mode Connect to the Network Access the Modem Router WiFi Connection Wired Connection To use WPS to connect to the WiFi network  To find and select the WiFi networkTypes of Logins Log In to the Modem Router To log in to the modem router Specify Initial Settings Notify Your Internet Provider  To set up your Internet connectionSpecify the Cable Connection Starting Frequency  To change the starting frequencySelect Cable Connection  To view the status of the modem router initialization View Modem Router InitializationSpecify the Internet Connection Settings  To specify the Internet connection settingsSelect Advanced Setup Internet Setup Specify Initial Settings Control Access to the Internet Set Up Parental Controls  To set up Live Parental ControlsSelect Parental Controls Control Access to the Internet Use Keywords to Block Internet Sites Click the Take me to the status screen button To block Internet sites Select Advanced Security Block Sites Click the Add Keyword button To delete keywords from the list Block Services from the Internet  To block servicesSelect Advanced Security Block Services Schedule When to Block Internet Sites and Services  To schedule blocking Avoid Blocking on a Trusted ComputerSelect Advanced Security Schedule  To specify a trusted computer To set up email notifications Set Up Security Event Email NotificationsControl Access to the Internet Modem Router Access a USB Drive on the Network USB Drive Requirements To connect a USB drive Control Access to the USB Drive  To specify the USB access settings To map the USB device to a Windows network drive Network Neighborhood/MacShare. Enabled by default Select Advanced USB Storage Advanced SettingsUse FTP Within the Network  To set up FTP access To view or change network folders View or Change Network Folders on a USB Drive To add a network folder Add a Network Folder on a USB DriveSelect Advanced ReadySHARE Click the Create Network Folder buttonApprove USB Devices Edit a Network Folder on a USB Drive To edit a network folder  To approve USB devicesSelect Advanced Advanced Setup USB Settings Click the Approved Devices buttonSelect the Allow only approved devices check box Select USB Storage Basic Settings Safely Remove a USB Drive To remove a USB disk drive safely Specify Network Settings View or Change the WAN Settings  To view or change the WAN settingsSelect Advanced Setup WAN Setup  To change the MTU size Change the MTU SizeCommon MTU sizes  To set up a default DMZ server Set Up a Default DMZ ServerSelect Advanced Setup LAN Setup Change the LAN TCP/IP SettingsChange the Modem Router’s Device Name  To change the modem router’s device name To change the LAN TCP/IP settings Specify the IP Addresses That the Modem Router Assigns  To reserve an IP address Reserve LAN IP Addresses To delete a reserved address entry  To edit a reserved address entrySpecify Basic WiFi Settings Use the WPS Wizard for WiFi Connections To use the WPS Wizard Select Advanced WPS Wizard To specify basic wireless settings  To change the WPA settings Change the WiFi Security Option To set up a guest network Set Up a WiFi Guest NetworkSelect Guest Network Use the WiFi On/Off Button Control the Wireless RadiosEnable or Disable the Wireless Radios  To enable or disable the wireless radiosSpecify WPS Settings Select Advanced Advanced Setup Wireless Settings To specify WPS settings  To set up wireless card access Set Up a Wireless Card Access ListClick the Set Up Access List button Select Advanced Advanced Setup Dynamic DNS  To set up Dynamic DNSSelect the Use a Dynamic DNS Service check box Dynamic DNS To enable Universal Plug and Play Select Advanced Advanced Setup UPnPImprove Network Connections with Universal Plug and Play  To refresh the information in the UPnP Portmap Table Manage Your Network View Cable Information View Modem Router Status To view modem router status and usage information  To view modem router cable information To view modem router Internet port information View Internet Port InformationWireless Settings Reboot the Modem Router To view wireless settings  To reboot the modem router To change the router mode Change the Router Mode To view and customize logs View Logs of Modem Router ActivitySelect Advanced Administration Logs View a Network Map To view the network map Back Up Settings Manage the Modem Router Configuration FileSelect Advanced Administration Network Map  To back up the modem router’s configuration settingsErase the Current Configuration Settings Restore Configuration SettingsSelect Advanced Administration Backup Settings  To restore configuration settings that you backed up To erase the configuration settings Change the admin Password To set the password for the user name admin Select Advanced Administration Set PasswordView Event Logs Select Advanced Administration Event LogRun the Ping Utility  To view the event logs To run a ping test Select Advanced Administration Diagnostics Run the Traceroute Utility To run a traceroute test View or Change the Modem Router Wireless Channel View Wireless Access Points in Your Area To manage your wireless access point AP Select Advanced Administration Wireless AP To view or change your wireless channel Select Advanced Administration Wireless ChannelRemote Management  To set up remote management  To use remote access Specify Internet Port Settings  To forward specific incoming protocols Set Up Port Forwarding to a Local ServerAdd a Custom Port Forwarding Service  To add a custom serviceClick the Add Custom Service button Delete a Port Forwarding Entry Edit a Port Forwarding Service To edit a port forwarding entry  To delete a port forwarding entryHow the Modem Router Implements the Port Forwarding Rule Application Example Make a Local Web Server Public To make a local web server public Set Up Port Triggering Add a Port Triggering Service To add a port triggering service Specify Internet Port Settings Specify When to Use Port Triggering  To specify when to use port triggeringClick the Apply button Application Example Port Triggering for Internet Relay Chat Troubleshooting Cannot Log In to the Modem Router Use LEDs to TroubleshootTroubleshoot the Cable Internet Connection Troubleshoot a TCP/IP Network Using a Ping UtilityPing Use Ping to Test the LAN Path to Your Modem RouterReply from IP address bytes=32 time=NN ms TTL=xxx Supplemental Information Factory default settings Factory Default SettingsAC1750 WiFi Cable Modem Router Factory default settings Technical Specifications