Netgear D7000 Nighthawk Ac1900 Wifi Vdsl Adsl Modem Router User Manual

							9.
To specify the interface ID for the IPv6 address of the modem router’s LAN interface, select the Use This
Interface ID check box, and enter the interface ID.
If y

ou do not specify an ID here, the modem router
 generates one automatically from its MAC address.
10. Select the IPv6 filtering mode:
•Secured. In secured mode, which is the default mode, the modem router inspects both TCP and UDP packets.
• Open. In open mode, the modem router inspects UDP packets only.
11. Clic

k the 
Apply button.
Your settings are saved.
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
fix

es 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 w
ebsite that does not open or displays only part of a web page
• Yahoo email
• MSN portal
• America Online’s DSL service
• 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. Manage the Internet Settings Manually
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							Table 3. 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 modem routers, adapters, and switches.
1500
Used in PPP
oE environments.
1492
Maximum size to use for pinging. (Larger packets are fragmented.)
1472
Used in some DHCP environments.
1468
Usable by AOL if you do not send or receive large email attachments, for example.
1460
Used in PPPoA environments.
1458
Used in PPTP environments or with VPN.
1436
Maximum size for AOL DSL.
1400
Change the MTU Size
WARNING: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. Change the MTU only if you are sure that it is
necessary for your ISP connection. To change the MTU size:
1.
Launch a web browser from a computer or WiFi device that is connected to the network.
2. Enter 
http://www.routerlogin.net.
A login window opens.
3. Enter the 
modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home page displays.
4. Select 
ADVANCED > Setup > WAN Setup.
The 
WAN Setup page displays. Manage the Internet Settings Manually
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							5.
In the MTU Size field, enter a value from 616 to 1500.
The nor
mal MTU (maximum transmit unit) value for most Ethernet networks is 1500 bytes, 1492 bytes for PPPoE
connections, or 1436 for PPTP connections.
6. Click the Apply button.
Y

our settings are saved. Manage the Internet Settings Manually
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							4
Manage the WiFi Network Settings
This chapter describes how you can manage the WiFi network settings of the modem router.
The chapter includes the f
ollowing sections:
• Manage the Basic WiFi Settings and WiFi Security of the Main Network on page 95
• Use 

WPS to Add a Device to the WiFi Network on page 
105
• Manage the Basic WiFi Settings and WiFi Security of the Guest Network on page 
107
• Control the WiFi Radios on page 
113
• Set Up a WiFi Schedule
 on page 114
• Manage the WPS Settings
 on page 117
• Manage Advanced WiFi Settings
 on page 118
• Use the Modem Router as a 
WiFi Access Point on page 119
F

or information about setting up an access control list (ACL) and managing WiFi access, see Allow or Block Access to
Y

our Network
 on page 124. 94 
						

							Manage the Basic WiFi Settings and WiFi Security of the Main
Network
The modem router comes with preset security. This means that the WiFi network name (SSID), network key
(pass
word), and security option (encryption protocol) are preset in the factory. The preset SSID and password are
uniquely generated for every device to protect and maximize your WiFi security. You can find the preset SSID and
password on the product label (see Bottom Panel Product Label
 on page 17).
IMPORTANT: We recommend that you do not change your preset security settings. If you do decide
to c

hange your preset security settings, make a note of the new settings and store the
note in a safe place where you can easily find it.
View or Change the Basic WiFi Settings
You can view or change the basic WiFi settings and WiFi security. The modem router simultaneously supports the
2.4 GHz band f

or 802.11b/g/n devices and the 5 GHz band for 802.11a/n/ac devices.
If you do decide to change the WiFi settings of the modem router’s main network, use a wired
connection to a

void being disconnected when the new WiFi settings take effect.
Tip
To view or change the basic WiFi settings: 1.
Launch a web browser from a computer or WiFi device that is connected to the network.
2. Enter 
http://www.routerlogin.net.
A login window opens.
3. Enter the 
modem router user name and password.
The user name is 
admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home page displays. Manage the WiFi Network Settings
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							4.
Select Wireless. 5.
View or change the basic WiFi settings and security settings.
The following table describes the fields on the Wireless Settings page. Description
Field
Region Selection
From the menu, select the region in which the modem router operates. It might not be legal to operate the modem router
 in a region other than the
regions listed in the menu. If your country or region is not listed, check with your
local government agency.
Note
Region
Wireless Network (2.4GHz b/g/n) Manage the WiFi Network Settings
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							Description
Field
The SSID is the WiFi network name. If you did not change the SSID, the default SSID displays.
The default SSID is also printed on the product label (see Bottom Panel Product Label on page
17). We recommend that you do not change the default SSID. If you must change
the SSID, enter a 32-character (maximum), case-sensitive name in this field.
Note
Name (SSID)
From the Channel menu, select Auto for automatic channel selection or select an individual
channel.
The default selection is Auto. In some regions, not all channels are available. Do not change the channel
unless you experience interference (shown by lost connections or slow data
transfers). If this situation occurs, experiment with different channels to see
which is the best.
Note If you use multiple WiFi access points (APs), reduce interference by selecting
different channels for adjacent APs. We recommend a channel spacing of four
channels between adjacent APs (for example, use Channels 1 and 5, or 6 and
10).
Note
Channel
From the Mode menu, select one of the following modes:
•Up to 54 Mbps. Legacy mode. This mode allows 802.11n, 802.11g, and 802.11b devices to
join the netw

ork but limits 802.11n devices to functioning at up to 54 Mbps.
• Up to 289 Mbps. Neighbor-friendly mode for reduced interference with neighboring WiFi
netw

orks. This mode allows 802.11n, 802.11g, and 802.11b devices to join the network but
limits 802.11n devices to functioning at up to 289 Mbps.
• Up to 600 Mbps
. Performance mode. This mode allows 802.11n, 802.11g, and 802.11b
devices to join the network and allows 802.11n devices to function at up to 600 Mbps. This
mode is the default mode. The 600 Mbps performance mode requires 256 QAM support on the WiFi
client.
Note WPA-PSK security supports speeds of up to 54 Mbps. Even if your devices
are capable of a higher speed, WPA-PSK security limits their speed to 54
Mbps.
Note
Mode
Manage the WiFi Network Settings
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							Description
Field
By default, the modem router broadcasts its SSID so that WiFi stations can detect the WiFi name
(SSID) in their scanned network lists. To turn off the SSID broadcast, clear the Enable SSID
Br
oadcast check box. Turning off the SSID broadcast provides additional WiFi security, but users
must know the SSID to be able to join the WiFi network of the modem router.
Enab

le SSID Broadcast
By default, 20/40 MHz coexistence is enabled to prevent interference between WiFi networks in
your environment at the expense of the WiFi speed. If no other WiFi networks are present in your
environment, you can clear the Enable 20/40 MHz Coexistence check box to increase the WiFi
speed to the maximum supported speed.
Enable 20/40 MHz
coexistence
Security Options
This information applies to the 2.4 GHz WiFi network. We recommend that you do 
not change your preset security settings (WPA2-PSK [AES]).
Note
If you must change the WiFi security, select one of the following WiFi security options for the modem router’s WiFi network:
• None. An open WiFi network that does not provide any security. Any WiFi device can join the network. We recommend
that y

ou do not use an open WiFi network.
• WEP. Wired Equivalent Privacy (WEP) security is a legacy authentication and data encryption mode that is superseded
b

y WPA-PSK and WPA2-PSK. The WEP option displays only if you select Up to 54 Mbps from the Mode menu. For
inf

ormation about configuring WEP, see Configure WEP Legacy WiFi Security on page 103.
• WP

A-PSK [TKIP]. WPA provides a secure connection but is superseded by WPA2. The WPA-PSK [TKIP] option
displa

ys only if you select Up to 54 Mbps from the Mode menu.
T

o use WPA security, in the Passphrase field, enter a phrase of 8 to 63 characters. To join the modem router’s WiFi
netw

ork, a user must enter this passphrase.
• WPA2-PSK [AES]. This option is the default setting. This type of security enables WiFi devices that support WPA2 to
join the modem router’s 2.4 GHz WiFi network. If you did not change the passphrase, the default passphrase displays.
The def

ault passphrase is printed on the product label (see Bottom Panel Product Label on page 17). WPA2 provides
a secure connection but some older WiFi devices do not detect WPA2 and support only WPA. If your network includes
such older devices, select WPA-PSK [TKIP] + WPA2-PSK [AES] security.
We recommend that you do not change the default passphrase. If you must change the passphrase, in the Passphrase
field, enter a phrase of 8 to 63 characters. To join the modem router’s WiFi network, a user must enter this passphrase.
• WPA-PSK [TKIP] + WPA2-PSK [AES]. This type of security enables WiFi devices that support either WPA or WPA2
to join the modem router’s 2.4 GHz WiFi network. However, WPA-PSK [TKIP] is less secure than WPA2-PSK [AES]
and limits the speed of 

WiFi devices to 54 Mbps.
To use this type of security, in the Passphrase field, enter a phrase of 8 to 63 characters. To join the modem router’s
WiFi netw

ork, a user must enter this passphrase.
• WPA/WPA2 Enterprise. This type of security requires that your WiFi network can access a RADIUS server. For
inf

ormation about configuring WPA/WPA2 Enterprise, see Configure WPA/WPA2 Enterprise WiFi Security on page
101
. Manage the WiFi Network Settings
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							Description
Field
Wireless Network (5GHz 802.11a/n/ac)
The SSID is the WiFi network name. If you did not change the SSID, the default SSID displays.
The default SSID is also printed on the product label (see Bottom Panel Product Label on page
17). We recommend that you do not change the default SSID. If you must change
the SSID, enter a 32-character (maximum), case-sensitive name in this field.
Note
Name (SSID)
From the Channel menu, select an individual channel. The default channel depends on your
selection from the Region menu. In some regions, not all channels are available. Do not change the channel
unless you experience interference (shown by lost connections or slow data
transfers). If this situation occurs, experiment with different channels to see
which is the best.
Note If you use multiple WiFi access points (APs), reduce interference by selecting
different channels for adjacent APs. We recommend a channel spacing of four
channels between adjacent APs.
Note
Channel
From the Mode menu, select one of the following modes:
• Up to 289 Mbps. Legacy mode. This mode allows 802.11ac, 802.11n, and 802.11a devices
to join the netw

ork but limits 802.11ac and 802.11n devices to functioning at up to 289 Mbps.
• Up to 600 Mbps. Neighbor-friendly mode for reduced interference with neighboring WiFi
netw

orks. This mode allows 802.11ac, 802.11n, and 802.11a devices to join the network but
limits 802.11ac devices to functioning at up to 600 Mbps.
• Up to 1300 Mbps. Performance mode. This mode allows 802.11ac, 802.11n, and 802.11a
de

vices to join the network and allows 802.11ac devices to function at up to 1300 Mbps. This
mode is the default mode.
Mode
By default, the modem router broadcasts its SSID so that WiFi stations can detect the WiFi name
(SSID) in their scanned network lists. To turn off the SSID broadcast, clear the Enable SSID
Br

oadcast check box. Turning off the SSID broadcast provides additional WiFi security, but users
must know the SSID to be able to join the WiFi network of the modem router.
Enab

le SSID Broadcast Manage the WiFi Network Settings
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							Description
Field
Security Options
This information applies to the 5 GHz WiFi network. We recommend that you do not change your preset security settings (WPA2-PSK [AES]).
Note
If you must change the WiFi security, select one of the following WiFi security options for the modem router’s WiFi network:
• None. An open WiFi network that does not provide any security. Any WiFi device can join the network. We recommend
that y

ou do not use an open WiFi network.
• WP

A2-PSK [AES]. This option is the default setting. This type of security enables WiFi devices that support WPA2 to
join the modem router’s 5 GHz WiFi network. If you did not change the passphrase, the default passphrase displays.
The def

ault passphrase is printed on the product label (see Bottom Panel Product Label on page 17). WPA2 provides
a secure connection but some older WiFi devices do not detect WPA2 and support only WPA. If your network includes
such older devices, select WPA-PSK [TKIP] + WPA2-PSK [AES] security.
We recommend that you do not change the default passphrase. If you must change the passphrase, in the Passphrase
field, enter a phrase of 8 to 63 characters. To join the modem router’s WiFi network, a user must enter this passphrase.
• WPA-PSK [TKIP] + WPA2-PSK [AES]. This type of security enables WiFi devices that support either WPA or WPA2
to join the modem router’

s 5 GHz WiFi network. However, WPA-PSK [TKIP] is less secure than WPA2-PSK [AES] and
limits the speed of WiFi devices to 54 Mbps.
To use this type of security, in the Passphrase field, enter a phrase of 8 to 63 characters. To join the modem router’s
WiFi netw

ork, a user must enter this passphrase.
• WPA/WPA2 Enterprise. This type of security requires that your WiFi network can access a RADIUS server. For
inf

ormation about configuring WPA/WPA2 Enterprise, see Configure WPA/WPA2 Enterprise WiFi Security on page
101.
6. Clic

k the 
Apply button.
Your settings are saved.
If you connected over WiFi to the network and you changed the SSID, you are disconnected from the network.
7. Make sure that you can reconnect over WiFi to the network with its new settings.
If you cannot connect over WiFi, check the following:
•If your computer or WiFi device is already connected to another WiFi network in your area, disconnect it from
that WiFi network and connect it to the WiFi network that the modem router provides. Some WiFi devices
automatically connect to the first open netw

ork without WiFi security that they discover.
• If your computer or WiFi device is trying to connect to your network with its old settings (before you changed
the settings), update the WiFi network selection in your computer or WiFi device to match the current settings
for your network.
• Does your WiFi device display as an attached device? (See View Devices Currently on the Network on page
236
.) If it does, it is connected to the network. Manage the WiFi Network Settings
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