NetComm NB1300PLUS4 manual When should I change my MTU settings?

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MTU: Maximum Transmission Unit indicates the network stack of any packet is larger than this value will be fragmented before the transmission. During the PPP negotiation, the peer of the PPP connection will indicates its MRU and will be accepted. The actual MTU of the

PPPconnection will be set to the smaller one of MTU and the peer's MRU. The default is value 1492.

MSS: Maximum Segment Size is the largest size of data that TCP will send in a single IP packet. When a connection is established between a LAN client and a host in the WAN side, the LAN client and the WAN host will indicate their MSS during the TCP connection handshake. The default value is 1432.

Automatic Reconnect: When it is checked, it will maintain the PPP connection all the time. If the ISP shut down the PPP connection, it will automatically reconnect PPP session. Authentication: When AUTO option is chosen, the PAP mode will run first then CHAP. If you are having connection problems with PPPoA or PPPoE connections it is recommended that you try forcing either PAP or CHAP modes.

Host name: Required by some ISPs. If the ISP does not provide the Host name, please leave it blank.

Q1: If the PPP is disconnected after the Disconnect Timeout and how can I reconnect it?

A:You have to go to the PPP Status under Admin Privileged column, choose the correct PVC and Connect option, and then click Execute to restart a new PPP secession. Alternatively you can click the CONNECT button at the bottom of the OnePage setup.

When should I change my MTU settings?

MTU settings should be changed to suit your ISPs recommendations if you are experiencing the following symptoms;

General emails send but emails with attachments fail

Can achieve a connection but some web pages wont load or can't download files.

Windows Update starts but fails to complete.

Your ISP recommends you change the setting.

What should I change my MTU settings to?

MTU settings should be set to 1492 to start with, if you still have problems try lowering them to 1456, 1400 or even as low as 750 to see if the problem improves. Your ISP is the best person to contact to find out what MTU setting to use.

Note: MTU above 1492 is likely to cause problems and is not likely to improve data throughput.

Advanced

Rev. 1 - YML674

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NB1300Plus4 ADSL Modem

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Contents Page Contents Adsl LAN WAN ATM Overview Package ContentsConnecting your NB1300Plus4 Adsl Modem via Ethernet Connecting your NB1300Plus4Connecting your NB1300Plus4 Adsl Modem via USB Do I need a Micro filter? PWR LED IndicatorsLoading an ISP profile into your NB1300Plus4 Using Easy ConfigOverview Field Setting Details Factory DefaultsResetting to factory defaults Configuration Types Adsl Modem Ethernet Adsl Modem Ethernet ConfigurationConnecting your computer to the NB1300Plus4 Configuring the NB1300Plus4 Second Router Method Operational Diagram for Adsl Modem Configuration Adsl Modem USB Adsl Modem USB ConfigurationConnecting your computer to the NB1300Plus4 Configuring the NB1300Plus4 Configuring your Computer/Router to use the NB1300Plus4 Operational Diagram for Adsl Modem Configuration Router Ethernet Adsl Gateway Router Ethernet ConfigurationAdsl Router Ethernet Adsl Router Configuring your Computer to use the NB1300Plus4Adsl Gateway Router Ethernet Operational Diagram for Ethernet Gateway Configuration Adsl Gateway Router USB Configuration Adsl Gateway Router USB Configuring the NB1300Plus4 VPI Operational Diagram for USB Gateway Configuration Macintosh USB Macintosh OS X USB ConfigurationMacintosh USB Macintosh USB USB or Ethernet? How to make changesMultiple Virtual Circuits Main Menu Simple Basic Menu One Page SetupStatus Show Advanced SettingsWAN RouterAdsl PPP Hide Advanced settings Main Menu Advanced One Page SetupAdministration ATM Where can I download the free software to test IgmpWhat should I change my MTU settings to? When should I change my MTU settings?LAN/DHCP DNS NAT Advanced Port Forwarding Adsl Configuration RIP Configuration Diagnostic Test Route Table MAC Filtering Security Admin Password User Password Misc Configuration Advanced System Log Advanced Code Update Status Router Adsl LAN WAN Status page shows the information and status of WAN PVCs ATM TCP Connections Learned MAC Table PPP Save Settings and Reboot Connect your NB1300Plus4 Adsl Modem via Ethernet Appendix a Connection InstructionsConnect your NB1300Plus4 Adsl Modem via USB Macintosh OS X USB Configuration Rev YML674 NB1300Plus4 Adsl Modem Rev YML674 PWR LED Not On Correct power up sequenceResetting the NB1300Plus4 Adsl Modem General Modem OperationWeb Based Interface Obtaining a WAN IP Address Internet / ISP ConnectionAdsl link Internet Browsing PPPoE or PPPoATesting the LAN Path to Your Adsl Modem Testing your TCP/IP Network Using a Ping UtilityPing -n 10 IP address Testing the Path from Your Computer to a Remote DeviceAppendix C Glossary LAN UBR Trademarks and Notices Contact InformationWarranty Registration Form Page Limitations of Warranty Product Warranty