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WAN Setup, MTU Size, Apply, Table 5-1., Common MTU Sizes - default login

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54 Mbps Wireless Router WGR614v8 User Manual • 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. If you suspect an MTU problem, a common solution is to change the MTU size to 1400. If you are willing to experiment, you can gradually reduce the MTU size from the maximum value of 1500 until the problem goes away. Table 5-1 describes common MTU sizes and applications. Table 5-1. Common MTU Sizes MTU 1500 1492 1472 1468 1460 1436 1400 576 Application The largest Ethernet packet size and the default value. This is the typical setting for nonPPPoE, non-VPN connections, and is the default value for NETGEAR routers, adapters, and switches. Used in PPPoE environments. Maximum size to use for pinging. (Larger packets are fragmented.) Used in some DHCP environments. Usable by AOL if you do not have large e-mail attachments, for example. Used in PPTP environments or with VPN. Maximum size for AOL DSL. Typical value to connect to dial-up ISPs. To change the MTU size: 1. In the main menu, under Advanced, select WAN Setup. 2. In the MTU Size field, enter a new size between 64 and 1500. 3. Click Apply to save the new configuration. Fine-Tuning Your Network v1.1, May 2008 5-21

Section	Page
NETGEAR 54 Mbps Wireless Router WGR614v8 User Manual	1
Contents	7
About This Manual	11
Conventions, Formats, and Scope	11
How to Use This Manual	12
How to Print This Manual	12
Revision History	13
Chapter 1 Configuring Internet Connectivity	15
Using the Router Smart Wizard to Connect to the Internet	15
Using the Setup Manual	16
Logging In to Your Wireless Router	16
Viewing and Configuring Basic ISP Settings	19
Setting Up and Testing Basic Wireless Connectivity	23
Chapter 2 Safeguarding Your Network	27
Choosing Appropriate Wireless Security	27
Recording Basic Wireless Settings Setup Information	31
Changing Wireless Security Settings	32
Viewing Basic Wireless Settings	32
Configuring WEP Wireless Security	33
Configuring WPA-PSK and WPA2-PSK Wireless Security	35
Viewing Advanced Wireless Settings	36
Using Push 'N' Connect (Wi-Fi Protected Setup)	38
Push Button Configuration	39
Security PIN Entry	40
Using the Router’s Security PIN	40
Using the Wireless Client’s Security PIN	40
Configuring the WPS Settings	41
Connecting Additional Wireless Client Devices after WPS Setup	42
Adding Additional WPS-Enabled Clients	42
Adding Additional Non-WPS-Enabled Clients	43
Restricting Wireless Access by MAC Address	43
Changing the Administrator Password	46
Backing Up Your Configuration	47
Understanding Your Firewall	47
Chapter 3 Restricting Access From Your Network	49
Content Filtering Overview	49
Blocking Access to Internet Sites	49
Blocking Access to Internet Services	51
Configuring a User-Defined Service	52
Blocking Services by IP Address Range	53
Scheduling Blocking	53
Viewing Logs of Web Access or Attempted Web Access	54
Configuring E-mail Alert and Web Access Log Notifications	55
Setting the Time	56
Chapter 4 Customizing Your Network Settings	57
Using the LAN IP Setup Options	57
Configuring a Device Name	58
Configuring LAN TCP/IP Setup Parameters	58
Using the Router as a DHCP Server	58
Using Address Reservation	59
Using a Dynamic DNS Service	60
Configuring the WAN Setup Options	62
Disabling the SPI Firewall	62
Setting Up a Default DMZ Server	62
Responding to a Ping on the Internet (WAN) Port	63
Setting the MTU Size	63
Configuring NAT Filtering	64
Disabling SIP ALG	64
Configuring Static Routes	64
Wireless Repeating (Also Called WDS)	66
Wireless Repeating Function	67
Setting Up the Base Station	68
Setting Up a Repeater Unit	69
Chapter 5 Fine-Tuning Your Network	71
Allowing Inbound Connections to Your Network	71
How Your Computer Accesses a Remote Computer through Your Router	72
How Port Triggering Changes the Communication Process	73
How Port Forwarding Changes the Communication Process	75
How Port Forwarding Differs from Port Triggering	76
Configuring Port Forwarding to Local Servers	76
Adding a Custom Service	77
Editing or Deleting a Port Forwarding Entry	78
Application Example: Making a Local Web Server Public	78
Configuring Port Triggering	79
Using Universal Plug and Play	82
Optimizing Wireless Performance	83
Configuring Quality of Service	84
Using WMM QoS for Wireless Multimedia Applications	85
Using the QoS Priority Rule List to Prioritize Internet Access	85
QoS for Applications and Online Gaming	86
QoS for a Router LAN Port	88
QoS for a MAC Address	89
Editing or Deleting an Existing QoS Policy	90
Changing the MTU Size	90
Overview of Home and Small Office Networking Technologies	92
Assessing Your Speed Requirements	93
Chapter 6 Using Network Monitoring Tools	95
Viewing Wireless Router Status Information	95
Viewing a List of Attached Devices	99
Managing the Configuration File	100
Backing Up and Restoring the Configuration	100
Erasing the Configuration	101
Upgrading the Router Software	101
Upgrading Automatically to New Router Software	103
Upgrading Manually to New Router Software	104
Enabling Remote Management Access	105
Chapter 7 Troubleshooting	107
Troubleshooting Quick Tips	107
Be sure to restart your network in this sequence.	107
Make sure that the Ethernet cables are securely plugged in.	108
Make sure that the wireless settings in the computer and router match exactly.	108
Make sure that the network settings of the computer are correct.	108
Check the Test light to verify correct router operation.	108
Troubleshooting Basic Functions	109
The Power light is not on or is blinking.	109
The lights never turn off.	109
The Internet or Ethernet port lights are not on.	110
The Wireless light is not on.	110
Troubleshooting the Web Configuration Interface	110
Troubleshooting the Internet Connection	111
Troubleshooting a Network Using the Ping Utility	112
Testing the LAN Path to Your Router	113
Testing the Path from Your Computer to a Remote Device	114
Problems with Date and Time	114
Solving Wireless Connection Problems	115
Using Your Wireless Card Setup Program	115
Setting Up and Testing Basic Wireless Connectivity	116
Restoring the Default Configuration and Password	119
Appendix A Technical Specifications	121
Restoring the Default User Name and Password	123
Appendix B Related Documents	125