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Manage the MTU size, MTU concepts

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AC1750 Smart WiFi Router Model R6350 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 Internet service, and the technical support of either the Internet service provider (ISP) or NETGEAR recommends changing the MTU setting. For example, if a secure website does not open, or displays only part of a web page, you might need to change the MTU. • 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. CAUTION: 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. 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 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. Specify Your Internet Settings 42 User Manual

Section	Page
Contents	3
1. Hardware Overview of the Router	10
Unpack Your Router	11
LEDs and Buttons on the Top Panel	12
Ports, Buttons, and Connectors on the Back Panel	13
Router Label	14
Position the Router	14
Cable Your Router	16
Wall-Mount Your Router	16
2. Connect to the Network and Access the Router	18
Connect to the network	19
Connect to the network using a wired connection	19
Find and connect to the WiFi network	19
WiFi connection using WPS	19
Types of logins	20
Use a web browser to access the router	20
Automatic Internet Setup	20
Log in to the router	22
Install and manage your router with the Nighthawk app	22
Change the language	23
3. Specify Your Internet Settings	24
Use the Internet Setup Wizard	25
Manually set up the Internet connection	25
Specify an Internet connection without a login	25
Specify an Internet connection that uses a login and PPPoE service	27
Specify an Internet connection that uses a login and PPTP or L2TP service	28
Specify IPv6 Internet connections	30
Requirements for entering IPv6 addresses	31
Use Auto Config for an IPv6 Internet connection	31
Use Auto Detect for an IPv6 Internet connection	33
Set up an IPv6 6to4 tunnel Internet connection	34
Set Up an IPv6 6rd Tunnel Connection	35
Set up an IPv6 pass-through Internet connection	37
Set up a fixed IPv6 Internet connection	37
Set up an IPv6 DHCP Internet connection	38
Set up an IPv6 PPPoE Internet connection	40
Manage the MTU size	42
MTU concepts	42
Change the MTU size	43
4. Optimize Performance	44
Optimize Traffic With QoS	45
Manage Default and Custom QoS Rules	46
Add a Custom QoS Rule for a Service or Application	46
Add a Custom QoS Rule for a Device	47
Change a QoS Rule or Change the Priority for a Rule	48
Remove a QoS Rule	49
Remove All QoS Rules	50
Manage Uplink Bandwidth Control	50
Manage Wi-Fi Multimedia Quality of Service	51
Improve network connections with Universal Plug and Play	52
5. Manage the Basic WiFi Network Settings	54
Manage the Basic WiFi Settings and WiFi Security of the Main Network	55
View or Change the Basic WiFi Settings and WiFi Security Settings	55
Configure WEP Legacy WiFi Security	61
Configure WPA/WPA2 Enterprise WiFi Security	62
Use WPS to Add a Device to the WiFi Network	64
Use WPS With the Push Button Method	65
Use WPS With the PIN Method	66
Manage the Basic WiFi Settings and WiFi Security of the Guest Network	67
Enable or Disable the WiFi Radios	71
6. Control Access to the Internet	72
Set Up Parental Controls	73
Enable access control to allow or block access to the Internet	73
Enable and Manage Network Access Control	75
Manage Network Access Control Lists	76
Add Devices to or Remove Them From the Allowed List	76
Add Devices to or Remove Them From the Blocked List	77
Use Keywords to Block Internet Sites	78
Set Up Blocking	78
Remove a Keyword or Domain From the Blocked List	79
Remove All Keywords and Domains From the Blocked List	80
Specify a Trusted Computer	81
Manage Simple Outbound Firewall Rules for Services and Applications	81
Add an Outbound Firewall Rule	82
Add an Outbound Firewall Rule for a Custom Service or Application	83
Change an Outbound Firewall Rule	85
Remove an Outbound Firewall Rule	85
Set Up a Schedule for Keyword Blocking and Outbound Firewall Rules	86
Set up security event email notifications	87
7. Share USB Storage Devices Attached to the Router	89
USB device requirements	90
Connect a USB storage device to the router	90
Access a storage device connected to the router	91
Access a storage device connected to the router from a Windows-based computer	91
Access a storage device that is connected to the router from a Mac	91
Map a USB device to a Windows network drive	92
Back up Windows-based computers with ReadySHARE Vault	93
Back up Mac computers with Time Machine	94
Set up a USB hard drive on a Mac	94
Prepare to back up a large amount of data	95
Use Time Machine to back up onto a USB hard disk	95
Manage Access to a Storage Device	97
Enable FTP access within your network	99
View network folders on a storage device	99
Add a network folder on a USB storage device	100
Edit a network folder on a USB storage device	101
Safely remove a USB storage device	102
8. Use Dynamic DNS to Access USB Storage Devices Through the Internet	103
Set up and manage Dynamic DNS	104
Set Up FTP Access Through the Internet	104
Your personal FTP server	105
Set Up Your Personal FTP Server	105
Set up a new Dynamic DNS account	106
Specify a DNS account that you already created	106
Change the Dynamic DNS settings	107
Access USB storage devices through the Internet	108
9. Use the Router as a Media Server	109
Specify ReadyDLNA Media Server Settings	110
Play Music From a Storage Device With iTunes Server	111
Set Up the Router’s iTunes Server With iTunes	111
Set Up the Router’s iTunes Server With the Remote App	112
Set Up the Router to Work With TiVo	113
10. Manage the WAN and LAN Network Settings	115
Change the WiFi Mbps Settings	116
Manage the WAN Security Settings	116
Set up a default DMZ server	117
Manage IGMP Proxying	118
Manage VPN Pass-Through	119
Manage NAT Filtering	119
Manage the SIP Application-Level Gateway	120
Manage the LAN IP Address Settings	121
Manage the Router Information Protocol Settings	122
Manage the DHCP Server Address Pool	123
Manage reserved LAN IP addresses	124
Edit a reserved IP address	124
Delete a reserved IP address entry	125
Disable the Built-In DHCP Server	125
Change the Router’s Device Name	126
Set Up and Manage Custom Static Routes	127
Set Up a Static Route	128
Change a Static Route	129
Remove a Static Route	130
Set Up a Bridge for a Port Group or VLAN Tag Group	130
Set Up a Bridge for a Port Group	131
Set Up a Bridge for a VLAN Tag Group	132
11. Manage Your Router	134
Update the router firmware	135
Check for new firmware and update the router	135
Manually upload firmware to the router	136
Change the admin password	137
Enable admin password recovery	137
Recover the admin password	138
Manage the router configuration file	139
Back up the settings	139
Restore the settings	139
Disable or Enable LED Blinking or Turn Off LEDs	140
Return the router to its factory default settings	141
Use the Reset button	141
Erase the settings	142
View the Status and Statistics of the Router	143
View information about the router and the Internet and WiFi settings	143
Display the statistics of the Internet port	144
Check the Internet connection status	145
Manage the Activity Log	146
View, Email, or Clear the Logs	146
Specify Which Activities Are Logged	147
View devices currently on the network	147
Monitor and Meter Internet Traffic	148
Start the Traffic Meter Without Traffic Volume Restrictions	148
View the Internet Traffic Volume and Statistics	149
Restrict Internet Traffic by Volume	150
Restrict Internet Traffic by Connection Time	151
Unblock the Traffic Meter After the Traffic Limit Is Reached	152
Remote access	153
Set up remote management	153
Use remote access	154
12. Manage the Advanced WiFi Features	155
Set Up a WiFi Schedule	156
Manage the WPS Settings	157
Manage Advanced WiFi Settings	158
Specify How the Router Manages WiFi Clients	159
Manage Airtime Fairness	159
Manage Implicit Beamforming	160
Manage MU-MIMO	161
Set Up a WiFi Bridge Between the Router and Another Device	161
Use the Router as a WiFi Access Point Only	164
13. Use VPN to Access Your Network	166
Set up a VPN connection	167
Specify VPN Service in the Router	167
Install OpenVPN software	168
Install OpenVPN Software on Your Windows-Based Computer	168
Install OpenVPN Software on Your Mac Computer	170
Install OpenVPN Software on an iOS Device	171
Install OpenVPN Software on an Android Device	172
Use a VPN Tunnel on Your Windows-Based Computer	173
Use VPN to Access the Router’s USB Device and Media	174
Use a VPN Tunnel to Access Your Internet Service at Home	174
Set Up VPN Client Internet Access in the Router	175
Block VPN Client Internet Access in the Router	175
Use VPN to access your Internet service at home	176
14. Manage Port Forwarding and Port Triggering	177
Manage Port Forwarding to a Local Server for Services and Applications	178
Forward Incoming Traffic for a Default Service or Application	178
Add a Port Forwarding Rule With a Custom Service or Application	179
Change a Port Forwarding Rule	180
Remove a Port Forwarding Rule	181
Application Example: Make a Local Web Server Public	182
How the Router Implements the Port Forwarding Rule	182
Manage Port Triggering for Services and Applications	183
Add a Port Triggering Rule	183
Change a Port Triggering Rule	185
Remove a Port Triggering Rule	185
Specify the Time-Out for Port Triggering	186
Disable Port Triggering	187
Application Example: Port Triggering for Internet Relay Chat	187
15. Troubleshooting	189
Quick tips	190
Sequence to restart your network	190
Check the power adapter and Ethernet cable connections	190
Check the WiFi settings	190
Check the network settings	190
Troubleshoot with the LEDs	191
Standard LED behavior when the router is powered on	191
Power LED is off or blinking	191
Internet or Ethernet LAN port LEDs are off	192
You cannot log in to the router	192
You cannot access the Internet	193
Troubleshoot Internet browsing	194
Changes are not saved	195
Troubleshoot WiFi connectivity	195
Troubleshoot your network using the ping utility	196
Test the LAN path to your router	196
Test the path from a Windows-based computer to a remote device	197
A. Supplemental Information	199
Factory Settings	200