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Manage the MTU Size, MTU Concepts

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AC1600 Smart WiFi Router Model R6260 Manage the MTU Size The maximum transmission unit (MTU) is the largest data packet a network device transmits. MTU Concepts 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 maximum transmission unit (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 your ISP or other Internet service, and the technical support of either the ISP 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 • 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. If you suspect an MTU problem, a common solution is to change the MTU to 1400. If you are willing to experiment, you can gradually reduce the MTU from the maximum value of 1500 until the problem goes away. The following table describes common MTU sizes and applications. Table 2. Common MTU sizes MTU 1500 1492 1472 1468 Application The largest Ethernet packet size. This setting is typical for connections that do not use PPPoE or VPN 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. Specify Your Internet Settings 36

Section	Page
Contents	3
1. Hardware Overview of the Router	9
Unpack Your Router	10
LEDs and Buttons on the Top Panel	11
Ports, Buttons, and Connectors on the Back Panel	12
Router Label	13
Position the Router	13
Cable Your Router	14
Wall-Mount Your Router	14
2. Connect to the Network and Access the Router	16
Connect to the Network	17
Wired Connection	17
WiFi Connection	17
WiFi Connection Using WPS	17
Types of Logins	18
Use a Web Browser to Access the Router	18
Automatic Internet Setup	18
Log In to the Router	19
Install or Manage Your Router With the NETGEAR Up App	20
Change the Language	20
3. Specify Your Internet Settings	21
Use the Internet Setup Wizard	22
Manually Set Up the Internet Connection	22
Specify an Internet Connection Without a Login	22
Specify an Internet Connection That Uses a Login and PPPoE Service	23
Specify an Internet Connection That Uses a Login and PPTP or L2TP Service	25
Specify IPv6 Internet Connections	26
Requirements for Entering IPv6 Addresses	27
Use Auto Config for an IPv6 Internet Connection	27
Use Auto Detect for an IPv6 Internet Connection	28
Set Up an IPv6 6to4 Tunnel Internet Connection	29
Set Up an IPv6 6rd Tunnel Connection	30
Set Up an IPv6 Pass Through Internet Connection	31
Set Up a Fixed IPv6 Internet Connection	32
Set Up an IPv6 DHCP Internet Connection	33
Set Up an IPv6 PPPoE Internet Connection	34
Manage the MTU Size	36
MTU Concepts	36
Change the MTU Size	37
4. Optimize Performance	38
Optimize Traffic With QoS	39
Manage Default and Custom QoS Rules	39
Add a Custom QoS Rule for a Service or Application	39
Add a Custom QoS Rule for a Device	40
Change a QoS Rule or Change the Priority for a Rule	41
Remove a QoS Rule	42
Remove All QoS Rules	43
Manage Uplink Bandwidth Control	43
Manage Wi-Fi Multimedia Quality of Service	44
Improve Network Connections With Universal Plug and Play	45
5. Manage the Basic WiFi Network Settings	47
Manage the Basic WiFi Settings and WiFi Security of the Main Network	48
View or Change the Basic WiFi Settings and WiFi Security Settings	48
Configure WEP Legacy WiFi Security	52
Configure WPA/WPA2 Enterprise WiFi Security	54
Use WPS to Add a Device to the WiFi Network	55
Use WPS With the Push Button Method	56
Use WPS With the PIN Method	57
Manage the Basic WiFi Settings and WiFi Security of the Guest Network	57
Enable or Disable the WiFi Radios	60
6. Control Access to the Internet	62
Set Up Parental Controls	63
Allow or Block Access to Your Network	63
Enable and Manage Network Access Control	65
Manage Network Access Control Lists	66
Add Devices to or Remove Them From the Allowed List	66
Add Devices to or Remove Them From the Blocked List	67
Use Keywords to Block Internet Sites	68
Set Up Blocking	68
Remove a Keyword or Domain From the Blocked List	69
Remove All Keywords and Domains From the Blocked List	69
Specify a Trusted Computer	70
Manage Simple Outbound Firewall Rules for Services and Applications	70
Add an Outbound Firewall Rule	71
Add an Outbound Firewall Rule for a Custom Service or Application	72
Change an Outbound Firewall Rule	73
Remove an Outbound Firewall Rule	74
Set Up a Schedule for Keyword Blocking and Outbound Firewall Rules	74
Set Up Security Event Email Notifications	75
7. Share USB Storage Devices Attached to the Router	77
USB Device Requirements	78
Connect a USB Storage Device to the Router	78
Access a Storage Device Connected to the Router	78
Access a Storage Device Connected to the Router From a Windows-Based Computer	79
Access a Storage Device That Is Connected to the Router From a Mac	79
Map a USB Device to a Windows Network Drive	80
Back Up Windows-Based Computers With ReadySHARE Vault	80
Back Up Mac Computers With Time Machine	81
Set Up a USB Hard Drive on a Mac	81
Prepare to Back Up a Large Amount of Data	82
Use Time Machine to Back Up Onto a USB Hard Disk	82
Manage Access to a Storage Device	83
Enable FTP Access Within Your Network	85
View or Change Network Folders on a Storage Device	86
Add a Network Folder on a USB Storage Device	86
Edit a Network Folder on a USB Storage Device	87
Safely Remove a USB Storage Device	88
8. Use Dynamic DNS to Access USB Storage Devices Through the Internet	89
Set Up and Manage Dynamic DNS	90
Set Up FTP Access Through the Internet	90
Your Personal FTP Server	91
Set Up Your Personal FTP Server	91
Set Up a New Dynamic DNS Account	91
Specify a DNS Account That You Already Created	92
Change the Dynamic DNS Settings	93
Access USB Storage Devices Through the Internet	94
9. Use the Router as a Media Server	95
Specify ReadyDLNA Media Server Settings	96
Play Music From a Storage Device With iTunes Server	97
Set Up the Router’s iTunes Server With iTunes	97
Set Up the Router’s iTunes Server With the Remote App	98
Set Up the Router to Work With TiVo	99
10. Manage the WAN and LAN Network Settings	100
Change the WiFi Mbps Settings	101
Manage the WAN Security Settings	101
Set Up a Default DMZ Server	102
Manage IGMP Proxying	103
Manage VPN Pass-Through	103
Manage NAT Filtering	104
Manage the SIP Application-Level Gateway	104
Manage the LAN IP Address Settings	105
Manage the Router Information Protocol Settings	106
Manage the DHCP Server Address Pool	106
Manage Reserved LAN IP Addresses	107
Edit a Reserved IP Address	108
Delete a Reserved IP Address Entry	108
Disable the Built-In DHCP Server	109
Change the Router’s Device Name	109
Set Up and Manage Custom Static Routes	110
Set Up a Static Route	110
Change a Static Route	111
Remove a Static Route	112
Set Up a Bridge for a Port Group or VLAN Tag Group	112
Set Up a Bridge for a Port Group	113
Set Up a Bridge for a VLAN Tag Group	114
11. Manage Your Router	116
Update the Router Firmware	117
Check for New Firmware and Update the Router	117
Manually Upload Firmware to the Router	118
Change the admin Password	118
Enable admin Password Recovery	119
Recover the admin Password	120
Manage the Router Configuration File	120
Back Up Settings	120
Restore Configuration Settings	121
Disable or Enable LED Blinking or Turn Off LEDs	121
Return the Router to Its Factory Default Settings	122
Use the Reset Button	122
Erase the Settings	123
View the Status and Statistics of the Router	124
View Information About the Router and the Internet and WiFi Settings	124
Display Internet Port Statistics	124
Check the Internet Connection Status	125
Manage the Activity Log	126
View, Email, or Clear the Logs	126
Specify Which Activities Are Logged	127
View Devices Currently on the Network	127
Monitor and Meter Internet Traffic	128
Start the Traffic Meter Without Traffic Volume Restrictions	128
View the Internet Traffic Volume and Statistics	129
Restrict Internet Traffic by Volume	129
Restrict Internet Traffic by Connection Time	130
Unblock the Traffic Meter After the Traffic Limit Is Reached	131
Remote Access	132
Set Up Remote Management	132
Use Remote Access	133
12. Manage the Advanced WiFi Features	134
Set Up a WiFi Schedule	135
Manage the WPS Settings	135
Manage Advanced WiFi Settings	136
Specify How the Router Manages WiFi Clients	137
Manage Airtime Fairness	137
Manage Implicit Beamforming	138
Manage MU-MIMO	139
Set Up a WiFi Bridge Between the Router and Another Device	139
Use the Router as a WiFi Access Point Only	141
13. Use VPN to Access Your Network	143
Set Up a VPN Connection	144
Specify VPN Service in the Router	144
Install OpenVPN Software	145
Install OpenVPN Software on Your Windows-Based Computer	145
Install OpenVPN Software on Your Mac Computer	147
Install OpenVPN Software on an iOS Device	147
Install OpenVPN Software on an Android Device	148
Use a VPN Tunnel on Your Windows-Based Computer	149
Use VPN to Access the Router’s USB Device and Media	149
Use a VPN Tunnel to Access Your Internet Service at Home	150
Set Up VPN Client Internet Access in the Router	151
Block VPN Client Internet Access in the Router	151
Use VPN to Access Your Internet Service at Home	152
14. Manage Port Forwarding and Port Triggering	153
Manage Port Forwarding to a Local Server for Services and Applications	154
Forward Incoming Traffic for a Default Service or Application	154
Add a Port Forwarding Rule With a Custom Service or Application	155
Change a Port Forwarding Rule	156
Remove a Port Forwarding Rule	157
Application Example: Make a Local Web Server Public	157
How the Router Implements the Port Forwarding Rule	158
Manage Port Triggering for Services and Applications	158
Add a Port Triggering Rule	159
Change a Port Triggering Rule	160
Remove a Port Triggering Rule	161
Specify the Time-Out for Port Triggering	161
Disable Port Triggering	162
Application Example: Port Triggering for Internet Relay Chat	162
15. Troubleshooting	164
Quick Tips	165
Sequence to Restart Your Network	165
Check Ethernet Cable Connections	165
WiFi Settings	165
Network Settings	165
Troubleshoot With the LEDs	165
Standard LED Behavior When the Router Is Powered On	166
Power LED Is Off or Blinking	166
Internet or Ethernet Port LEDs Are Off	166
You Cannot Log In to the Router	166
You Cannot Access the Internet	167
Troubleshoot Internet Browsing	168
Changes Are Not Saved	169
Troubleshoot WiFi Connectivity	169
Troubleshoot Your Network Using the Ping Utility	169
Test the LAN Path to Your Router	170
Test the Path From a Windows-Based Computer to a Remote Device	170
A. Supplemental Information	172
Factory Settings	173

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Manage the MTU Size

The maximum transmission unit (MTU) is the largest data packet a network device transmits.

MTU Concepts

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 maximum transmission unit (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 your ISP or other Internet service, and the technical support of

either the ISP 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

•

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.

If you suspect an MTU problem, a common solution is to change the MTU to 1400. If you are willing to

experiment, you can gradually reduce the MTU from the maximum value of 1500 until the problem goes

away.The following table describes common MTU sizes and applications.

Table 2. Common MTU sizes

Application

MTU

The largest Ethernet packet size.This setting is typical for connections

that do not use PPPoE or VPN and is the default value for NETGEAR

routers, adapters, and switches.

1500

Used in PPPoE environments.

1492

Maximum size to use for pinging. (Larger packets are fragmented.)

1472

Used in some DHCP environments.

1468

Specify Your Internet Settings

AC1600 Smart WiFi Router Model R6260