Netgear C6900 High Speed Cable Modem Router User Manual

							Specify Network Settings 
41  Nighthawk AC1900 WiFi Cable Modem Router
Your change takes effect.
Change the Modem Router’s Device Name
The modem router’s device name is C6900. This device name displays in file manager when 
you browse your network.
To change the modem router’s device name:
1. Launch an Internet browser from a computer or wireless device that is connected to the 
network.
2. Type http://www.routerlogin.net or http://www.routerlogin.com.
A login window opens.
3. Enter the user name and password.
The user name is admin. The user name and password are case-sensitive.
The BASIC Home page displays.
4. Select ADVANCED > Setup > LAN Setup.
5. In the Device Name field, type a new name.
6. Click the Apply button.
Your change is saved.
Change the LAN TCP/IP Settings
The modem router is preconfigured to use private IP addresses on the LAN side and to act 
as a DHCP server. The modem router’s default LAN IP configuration is as follows:
•LAN IP address. 192.168.0.1
•Subnet mask. 255.255.255.0
These addresses are part of the designated private address range for use in private networks 
and are suitable for most applications. If your network requires a different IP addressing 
scheme, you can change these settings
You might want to change these settings if you need a specific IP subnet that one or more 
devices on the network uses, or if you have competing subnets with the same IP scheme.
To change the LAN TCP/IP settings:
1. Launch an Internet browser from a computer or wireless device that is connected to the 
network.
2. Type http://www.routerlogin.net or http://www.routerlogin.com.
A login window opens.
3. Enter the user name and password. 
						

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The user name is  admin. The user name and password are case-sensitive.
The BASIC Home page displays.
4.  Select  ADV
 ANCED > Setup > LAN Setup .
5.  In the IP Address field, type the IP address.
6.  In the IP Subnet Mask , type the subnet mask of the modem router. 
The IP address and subnet mask identifies which addresses are local to a\
 specific device  and which must be reached through a gateway or modem router.
7.  Click the  Apply button.
Your changes are saved.
If you changed the LAN IP address of the modem router, you are disconnec\
ted when this 
change takes ef
 fect.
8.  T
o reconnect, close your browser, relaunch it, and log in to the  modem router
Specify the IP Addresses that the Modem Router Assigns
By default, the modem router acts as a Dynamic Host Configuration Protoc\
ol (DHCP) server. 
The modem router assigns IP, DNS server, and default gateway addresses to all computers  connected to the LAN. The assigned default gateway address is the LAN address of the 
modem router. 
These addresses must be part of the same IP address subnet as the modem \
router’s LAN IP  address. Using the default addressing scheme, define a range between 192\
.168.0.2 and 
192.168.0.254, although you can save part of the range for devices with \
fixed addresses. 
						

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 Nighthawk AC1900
 WiFi Cable Modem  Router
To specify the pool of IP addresses that the modem router assigns:
1. Launch an Internet browser from a computer or wireless device that is co\
nnected to the 
network.
2.  T
ype  http://www.routerlogin.net  or http://www.routerlogin.com .
A login window opens.
3.  Enter the user name and password.
The user name is  admin. 
 The user name and password are case-sensitive.
The BASIC Home page displays.
4.  Select  ADV
 ANCED > Setup > LAN Setup .
5.  Make sure that the  Use Router as DHCP Server  check box is selected.
6.  Specify the range of IP addresses that the  modem router assigns:
a. In the  Starting IP 
 Address field, type the lowest number in the range.
This IP address must be in the same subnet as the modem router.
b.  In the  Ending IP 
 Address field, type the number at the end of the range of IP 
addresses.
This IP address must be in the same subnet as the modem router.
7.  Click the  Apply button.
Your settings are saved.
The modem router delivers the following parameters to any LAN device tha\
t requests DHCP: • An IP address from the range that you have defined
• Subnet mask
• Gateway IP address (the modem router’
 s LAN IP address)
• DNS server IP address (the modem router’
 s LAN IP address) 
						

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44 Nighthawk AC1900 WiFi Cable Modem Router 
Disable the DHCP Server Feature in the Modem Router
By default, the modem router acts as a DHCP server. The modem router assigns IP, DNS 
server, and default gateway addresses to all computers connected to the LAN. The assigned 
default gateway address is the LAN address of the modem router.
You can use another device on your network as the DHCP server, or specify the network 
settings of all your computers.
To disable the DHCP server feature in the modem router:
1. Launch an Internet browser from a computer or wireless device that is connected to the 
network.
2. Type http://www.routerlogin.net or http://www.routerlogin.com.
A login window opens.
3. Enter the user name and password.
The user name is admin. The user name and password are case-sensitive.
The BASIC Home page displays.
4. Select ADVANCED > Setup > LAN Setup.
5. Clear the Use Router as DHCP Server check box.
6. Click the Apply button.
7. (Optional) If this service is disabled and no other DHCP server is on your network, set your 
computer IP addresses manually so that they can access the modem router.
Reserve LAN IP Addresses
When you specify a reserved IP address for a computer on the LAN, that computer always 
receives the same IP address each time it accesses the modem router’s DHCP server. 
Assign reserved IP addresses to computers or servers that require permanent IP settings. 
To reserve an IP address: 
1. Launch an Internet browser from a computer or wireless device that is connected to the 
network.
2. Type http://www.routerlogin.net or http://www.routerlogin.com.
A login window opens.
3. Enter the user name and password.
The user name is admin. The user name and password are case-sensitive.
The BASIC Home page displays.
4. Select ADVANCED > Setup > LAN Setup.
5. In the Address Reservation section, click the Add button.  
						

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45  Nighthawk AC1900 WiFi Cable Modem Router
6. In the IP Address field, type the IP address to assign to the computer or server. 
Choose an IP address from the modem router’s LAN subnet, such as 192.168.0.x. 
7. Type the MAC address of the computer or server.
Tip:If the computer is already on your network, you can copy its MAC 
address from the Attached Devices page and paste it here.
8. Click the Apply button.
The reserved address is entered into the table. 
The reserved address is not assigned until the next time the computer contacts the modem 
router’s DHCP server. Reboot the computer, or access its IP configuration and force a DHCP 
release and renew.
To edit a reserved address entry:
1. Select the radio button next to the reserved address. 
2. Click the Edit button.
3. Change the settings.
4. Click the Apply button.
Your changes are saved.
To delete a reserved address entry:
1. Select the radio button next to the reserved address. 
2. Click the Delete button.
The address is removed.
Improve Network Connections with Universal Plug and 
Play
Universal Plug and Play (UPnP) helps devices, such as Internet appliances and computers, 
access the network and connect to other devices as needed. UPnP devices can 
automatically discover the services from other registered UPnP devices on the network.
If you use applications such as multiplayer gaming, peer-to-peer connections, or real-time 
communications such as instant messaging or remote assistance (a feature in Windows XP), 
enable UPnP.
To enable Universal Plug and Play:
1. Launch an Internet browser from a computer or wireless device that is connected to the 
network.
2. Type http://www.routerlogin.net or http://www.routerlogin.com.
A login window opens. 
						

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46 Nighthawk AC1900 WiFi Cable Modem Router 
3. Enter the user name and password.
The user name is admin. The user name and password are case-sensitive.
The BASIC Home page displays.
4. Select ADVANCED > Advanced Setup > UPnP. 
The UPnP page displays. 
5. Select the Turn UPnP On check box.
By default, this check box is selected. UPnP for automatic device configuration can be 
enabled or disabled. If the Turn UPnP On check box is cleared, the modem router does 
not allow any device to automatically control modem router resources, such as port 
forwarding.
6. Type the advertisement period in minutes.
The advertisement period specifies how often the modem router broadcasts its UPnP 
information. This value can range from 1 to 1440 minutes. The default period is 30 
minutes. Shorter durations ensure that control points have current device status at the 
expense of more network traffic. Longer durations can compromise the freshness of the 
device status, but can significantly reduce network traffic.
7. Type the advertisement time to live in hops.
The time to live for the advertisement is measured in hops (steps) for each UPnP packet 
sent. Hops are the steps a packet takes between routers. The number of hops can range 
from 1 to 255. The default value for the advertisement time to live is 4 hops, which should 
be fine for most home networks. If you notice that some devices are not being updated or 
reached correctly, it might be necessary to increase this value.
8. Click the Apply button.
The UPnP Portmap Table displays the IP address of each UPnP device that is accessing 
the modem router and which ports (internal and external) that device has opened. The 
UPnP Portmap Table also displays what type of port is open and whether that port is still 
active for each IP address.
To refresh the information in the UPnP Portmap table, click the Refresh button.
Use the WPS Wizard for WiFi Connections
The WPS Wizard helps you add a wireless computer or device to your WiFi network without 
typing the WiFi password.
To use the WPS Wizard:
1. Launch an Internet browser from a computer or wireless device that is connected to the 
network.
2. Type http://www.routerlogin.net or http://www.routerlogin.com.
A login window opens. 
						

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47  Nighthawk AC1900 WiFi Cable Modem Router
3. Enter the user name and password.
The user name is admin. The user name and password are case-sensitive.
The BASIC Home page displays.
4. Select ADVANCED > WPS Wizard.
5. Click the Next button. 
6. Select the radio button for the setup method that you want to use:. 
•Push button. Click the WPS button on this page. 
•PIN Number. The page adjusts. Enter the client security PIN, and click the Next 
button.
7. Within two minutes, go to the client device and use its WPS software to connect to the WiFi 
network.
The WPS process automatically sets up your wireless computer with the network 
password when it connects. The modem router WPS page displays a confirmation 
message. 
Specify Basic WiFi Settings
The modem router comes with preset security. This means that the WiFi network name 
(SSID), network key (password), and security option (encryption protocol) are preset in the 
factory. You can find the preset SSID and password on the product label. 
Note:The preset SSID and password are uniquely generated for every 
device to protect and maximize your wireless security.
NETGEAR recommends that you do not change your preset security settings. If you change 
your preset security settings, make a note of the new settings and store it in a safe place 
where you can easily find it.
If you use a wireless computer to change the wireless network name (SSID) or other wireless 
security settings, you are disconnected when you click the Apply button. To avoid this 
problem, use a computer with a wired connection to access the modem router.
To specify basic wireless settings:
1. Launch an Internet browser from a computer or wireless device that is connected to the 
network.
2. Type http://www.routerlogin.net or http://www.routerlogin.com.
A login window opens.
3. Enter the user name and password.
The user name is admin. The user name and password are case-sensitive. 
						

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Nighthawk AC1900
 WiFi Cable Modem  Router 
The BASIC Home page displays.
4.  Select  W
 ireless.
5.  In the Region list, select your region. In some locations, you cannot change this set\
ting.
6.  T
o control the SSID broadcast, select or clear the  Enable SSID Broadcast check box.
When this check box is selected, the modem router broadcasts its network\
 name (SSID) 
so that it displays when you scan for local WiFi networks on your comput\
er or wireless 
device.
7.  T
o change the network name (SSID), type a new name in the  Name (SSID) field.
The name can be up to 32 characters long and it is case-sensitive. The default SSID is 
randomly generated and is on the product label. If you change the name, \
make sure to 
write down the new name and keep it in a safe place.
8.  T
o change the wireless channel, select a number in the  Channel list.
In some regions, not all channels are available. Do not change the chann\
el unless you 
experience interference (shown by lost connections or slow data transfe\
rs). If this 
happens, experiment with dif

ferent channels to see which is the best. 
When you use multiple access points, it is better if adjacent access poi\
nts use different 
channels to reduce interference. 
 The recommended channel spacing between adjacent 
access points is four channels (for example, use Channels 1 and 5, or 6\
 and 10).
9.  T
o change the mode, select it from the Mode list.
For 2.4 GHz, Up to 600 Mbps is the default setting. 
 The other settings are Up to 289 
Mbps and Up to 54 Mbps. 
						

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49  Nighthawk AC1900 WiFi Cable Modem Router
At 5 GHz, Up to 1300 Mbps is the default setting, which allows 802.11ac and 802.11a 
wireless devices to join the network. The other settings are Up to 600 Mbps and Up to 
289 Mbps.
10. Click the Apply button.
Your settings are saved.
If you connected wirelessly to the network and you changed the SSID, you are 
disconnected from the network.
11. Make sure that you can connect wirelessly to the network with its new settings. 
If you cannot connect wirelessly, check the following:
•Is your computer or wireless device connected to another wireless network in your 
area? Some wireless devices automatically connect to the first open network without 
wireless security that they discover.
•Is your computer or wireless device trying to connect to your network with its old 
settings (before you changed the settings)? If so, update the wireless network 
selection in your computer or wireless device to match the current settings for your 
network.
Change the WiFi Security Option
Your modem router comes with preset WPA2 or WPA security. The password that you enter 
to connect to your network is unique to your modem router and is on the product label. 
NETGEAR recommends that you use the preset security, but you can change them. 
NETGEAR recommends that you do not disable security.
To change the WPA settings:
1. Launch an Internet browser from a computer or wireless device that is connected to the 
network.
2. Type http://www.routerlogin.net or http://www.routerlogin.com.
A login window opens.
3. Enter the user name and password.
The user name is admin. The user name and password are case-sensitive.
The BASIC Home page displays.
4. Select Wireless.
5. Under Security Options, select a WPA option.
The WPA2 options use the newest standard for the strongest security, but some older 
computers and wireless devices cannot use WPA2. By default, the WPA2-PSK [AES] 
radio button is selected. 
The Passphrase field displays.
6. In the Passphrase field, enter the network key (password) that you want to use.  
						

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Nighthawk AC1900
 WiFi Cable Modem  Router 
It is a text string from 8 to 63 characters.
7.  W
rite down the new password and keep it in a secure place for future refe\
rence.
8. Click the  Apply button.
Your changes are saved.
Set Up a Guest Network
A guest network allows visitors at your home to use the Internet without\
 using your wireless  security key. You can add a guest network to each wireless network: 2.4 GHz b/g/n and  
5.0 GHz a/n. 
To set up a guest network:
1.  Launch an Internet browser from a computer or wireless device that is co\
nnected to the 
network.
2.  T
ype  http://www.routerlogin.net  or http://www.routerlogin.com .
A login window opens.
3.  Enter the user name and password.
The user name is  admin. 
 The user name and password are case-sensitive.
The BASIC Home page displays.
4.  Select  Guest Network .
5.  Select any of the following wireless settings: