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Changing the MTU Size, America Online's DSL service - best settings

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Wireless-N 150 Router WNR1000v2 User Manual • Microwave ovens (no closer than 10 feet) • Choose your settings. - Use a scanning utility to determine what other wireless networks are operating nearby, and choose an unused channel. - Turn off SSID broadcast, and change the default SSID. Other nearby devices might automatically try to connect to your network several times a second, which can cause significant performance reduction. • Use WMM to improve the performance of voice and video traffic over the wireless link. Changing 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 any device in the data path has a lower MTU setting than the other devices, the data packets must be split or "fragmented" to accommodate the one with the smallest MTU. The best MTU setting for NETGEAR equipment is often just the default value, and changing the value might fix one problem but cause another. Leave MTU unchanged unless one of these situations occurs: • You have problems connecting to your ISP, or other Internet service, and either the technical support of the ISP or of NETGEAR recommends changing the MTU size. These might require an MTU change: - A secure Web site that will not open, or displays only part of a Web page - Yahoo e-mail - MSN - America Online's DSL service • You use VPN and have severe performance problems. • You used a program to optimize MTU for performance reasons, and now you have connectivity or performance problems. Note: An incorrect MTU setting can cause Internet communication problems such as the inability to access certain Web sites, frames within Web sites, secure login pages, or FTP or POP servers. Fine-Tuning Your Network v1.0, September 2009 5-15

Section	Page
Wireless-N 150 Router WNR1000v2 User Manual	1
Contents	7
About This Manual	11
Chapter 1 Configuring Basic Connectivity	15
Using the Setup Manual	15
Logging In To Your Wireless Router	16
Selecting a Language for Your Screen Display	19
Configuring Your Internet Settings Using the Setup Wizard	20
Viewing and Configuring Basic Internet Settings	20
Your Internet Connection Does Not Require a Login	21
Your Internet Connection Does Require a Login	23
Setting Up and Testing Basic Wireless Connectivity	25
Chapter 2 Safeguarding Your Network	29
Choosing Appropriate Wireless Security	29
Recording Basic Wireless Settings Setup Information	33
Changing Wireless Security Settings	34
Viewing Basic Wireless Settings	34
Configuring WEP Wireless Security	36
Configuring WPA-PSK and WPA2-PSK Wireless Security	38
Viewing Advanced Wireless Settings	39
Using Push 'N' Connect (Wi-Fi Protected Setup)	41
Push Button Configuration	41
Security PIN Entry	43
Configuring the WPS Settings	44
Connecting Additional Wireless Client Devices after WPS Setup	45
Restricting Wireless Access by MAC Address	46
Changing the Administrator Password	48
Backing Up Your Configuration	49
Understanding Your Firewall	50
Chapter 3 Restricting Access From Your Network	51
Content Filtering Overview	51
Blocking Access to Internet Sites	51
Blocking Access to Internet Services	53
Blocking Services by IP Address Range	55
Scheduling Blocking	55
Viewing Logs of Web Access or Attempted Web Access	56
Configuring E-mail Alert and Web Access Log Notifications	57
Setting the Time Zone	58
Chapter 4 Customizing Your Network Settings	59
Using the LAN IP Setup Options	59
Configuring a Device Name	60
Configuring LAN TCP/IP Setup Parameters	60
Using the Router as a DHCP Server	61
Using Address Reservation	62
Using a Dynamic DNS Service	63
Configuring the WAN Setup Options	64
Disabling the SPI Firewall	64
Setting Up a Default DMZ Server	65
Responding to a Ping on the Internet (WAN) Port	65
Setting the MTU Size	66
Configuring NAT Filtering	66
Configuring Static Routes	66
Chapter 5 Fine-Tuning Your Network	69
Allowing Inbound Connections to Your Network	69
How Your Computer Accesses a Remote Computer through Your Router	70
How Port Triggering Changes the Communication Process	71
How Port Forwarding Changes the Communication Process	73
How Port Forwarding Differs from Port Triggering	74
Configuring Port Forwarding to Local Servers	74
Adding a Custom Service	75
Editing or Deleting a Port Forwarding Entry	76
Configuring Port Triggering	77
Using Universal Plug and Play	80
Optimizing Wireless Performance	82
Changing the MTU Size	83
Overview of Home and Small Office Networking Technologies	84
Assessing Your Speed Requirements	85
Chapter 6 Using Network Monitoring Tools	87
Viewing Wireless Router Status Information	88
Viewing a List of Attached Devices	93
Managing the Configuration File	93
Backing Up and Restoring the Configuration	94
Erasing the Configuration	94
Updating the Router Firmware	95
Checking for New Firmware in the Router Upgrade Screen	95
Updating Manually to New Router Firmware	96
Enabling Remote Management Access	98
Traffic Meter	100
Chapter 7 Troubleshooting	103
Quick Tips	103
Troubleshooting Basic Functions	104
Login Problems	107
Checking the Internet Service Connection	108
Obtaining an Internet IP Address	108
Troubleshooting PPPoE	109
Troubleshooting Internet Browsing	110
Troubleshooting Your Network Using the Ping Utility	110
Testing the LAN Path to Your Router	111
Testing the Path from Your Computer to a Remote Device	112
Problems with Date and Time	112
Problems with Wireless Adapter Connections	113
Restoring the Default Configuration and Password	114
Appendix A Technical Specifications	117
Default Configuration Settings	117
General Specifications	119
Appendix B Related Documents	121

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Wireless-N 150 Router WNR1000v2 User Manual

Fine-Tuning Your Network

5-15

v1.0, September 2009

•

Microwave ovens (no closer than 10 feet)

•

Choose your settings.

–

Use a scanning utility to determine what other wireless networks are operating nearby, and

choose an unused channel.

–

Turn off SSID broadcast, and change the default SSID. Other nearby devices might

automatically try to connect to your network several times a second, which can cause

significant performance reduction.

•

Use WMM to improve the performance of voice and video traffic over the wireless link.

Changing 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 any device in the data path has a lower MTU setting than

the other devices, the data packets must be split or “fragmented” to accommodate the one with the

smallest MTU.

The best MTU setting for NETGEAR equipment is often just the default value, and changing the

value might fix one problem but cause another. Leave MTU unchanged unless one of these

situations occurs:

•

You have problems connecting to your ISP, or other Internet service, and either the technical

support of the ISP or of NETGEAR recommends changing the MTU size. These might require

an MTU change:

–

A secure Web site that will not open, or displays only part of a Web page

–

Yahoo e-mail

–

MSN

–

America Online’s DSL service

•

You use VPN and have severe performance problems.

•

You used a program to optimize MTU for performance reasons, and now you have

connectivity or performance problems.

Note:

An incorrect MTU setting can cause Internet communication problems such as the

inability to access certain Web sites, frames within Web sites, secure login pages,

or FTP or POP servers.