Advanced Settings

46

NETGEAR DOCSIS 3.0 N450 Wi-Fi Data Gateway

By default, this check box is cleared. This

prevents the gateway from allowing any

devices to automatically control the

resources, such as port forwarding, of

the gateway.

3.

Complete the Advertisement Period and

Advertisement Time to Live fields.

The UPnP Portmap Table displays the IP

address of each UPnP device that is

accessing the gateway and which

internal and external ports of the gateway

that device opened. The UPnP Portmap Table also displays the protocol for the port that

was opened and if that port is still active for each IP address.

4.

Perform one of the following actions:

•

Click

Apply

to save your settings.

•

Click

Cancel

to disregard any unsaved changes.

•

Click

Refresh

to update the UPnP Portmap Table and to show the active ports that

are currently opened by UPnP devices.

Set Networking Protocols

Network Time Protocol (NTP) is a networking protocol that synchronizes clocks between

computer systems over packet-switched, variable-latency data networks.



To enable NTP:

1.

In the main menu, under Advanced, select

NTP

.

2.

Select the

NTP enable

check box.

3.

Enter the IP server addresses.

a.

Enter the first server IP address in the Server IP Address 1 field.

b.

Enter the second server IP address in the Server IP Address 2 field.

c.

Enter the third server IP address in the

Server IP Address 3 field.

4.

Click

Apply

.

Advanced Settings

47

NETGEAR DOCSIS 3.0 N450 Wi-Fi Data Gateway

Enable Network

Address T

ranslation

Network Address Translation (NAT) provides one-to-many translation of IP addresses between

devices. This means that your network presents only one IP address to the Internet, and outside

users cannot directly address any of your local computers. Enable NAT to allow multiple

computers on your network to access the Internet using a single public IP address. NAT is

enabled by default.



To disable NAT:

1.

In the main menu, under Advanced, select

NAT

.

2.

Deselect the

Turn NAT On

box.

3.

Click

Apply

.

Remove USB Devices



To remove a USB device:

1.

In the main menu, under USB Storage, select

Basic Settings

.

2.

Click

Safely Remove USB Device

.

48

6

6.

T

roubleshooting

This chapter gives information about troubleshooting your NETGEAR DOCSIS 3.0 N450 Wi-Fi

Data Gateway. For the common problems listed, see the section indicated.

•

Have I connected the gateway correctly?

See

Basic Functions

on page

49.

•

I cannot access the gateway configuration with my browser.

See

Connect to the Gateway’s Main Menu

on page

49.

•

I have configured the gateway but I cannot access the Internet.

See

Troubleshoot the ISP Connection

on page

50.

•

My gateway is not responding.

•

See

Troubleshoot a TCP/IP Network Using a Ping Utility

on page

50

If you cannot remember the gateway’s configuration password or you want to clear the

configuration and start over again, see

Factory Default Settings

on page

54.

Tip:

NETGEAR provides helpful articles, documentation, and the latest

software updates at

Troubleshooting

49

NETGEAR DOCSIS 3.0 N450 Wi-Fi Data Gateway

Basic Functions

After you have turned on power to the gateway, do the following:

1.

Check to see that the Power LED is lit.

2.

Check that the numbered Ethernet LEDs light momentarily.

3.

After a few seconds, check that the LEDs are lit for any local ports that are connected.

The following table provides help when you are using the LEDs for troubleshooting.

Table 1.

LED behavior

Connect to the Gateway’

s Main Menu

If you are unable to access the gateway’s main menu from a computer on your local network,

check the following:

•

Check the Ethernet connection between the computer and the gateway as described in

the previous section.

LED Behavior

Action

All LEDs are off when the gateway

is plugged in.

•

Make sure that the power cord is properly connected to your

gateway and that the power supply adapter is properly connected

to a functioning power outlet.

•

Check that you are using the 12V-DC power adapter supplied by

NETGEAR for this product.

If the error persists, you have a hardware problem and should contact

technical support.

All LEDs stay on.

Clear the gateway’s configuration to factory defaults. This sets the

gateway’s IP address to 192.168.0.1. See

Factory Default Settings

on

page

54.

If the error persists, you might have a hardware problem and should

contact technical support.

LAN LED is off for a port with an

Ethernet connection.

•

Make sure that the Ethernet cable connections are secure at the

gateway and at the hub or computer.

•

Make sure that power is turned on to the connected hub or

computer.

•

Be sure that you are using the correct cable.

Internet LED is off and the

gateway is connected to the cable

television cable.

•

Make sure that the coaxial cable connections are secure at the

gateway and at the wall jack.

•

Make sure that your cable service provider provisioned your cable

Internet service. Your provider should verify that the signal quality

is good enough for cable modem service.

•

Remove any excessive splitters you might have on your cable line.

It might be necessary to run a “home run” back to the point where

the cable enters your home.

Troubleshooting

50

NETGEAR DOCSIS 3.0 N450 Wi-Fi Data Gateway

•

Make sure that your computer’s IP address is on the same subnet as the gateway. If you

are using the recommended addressing scheme, your computer’s address should be in

the range of 192.168.0.10 to 192.168.0.254.

Note:

If your computer’s IP address is shown as 169.254.x.x:

Recent versions of Windows and Mac OS generate and assign an IP

address if the computer cannot reach a DHCP server. These

autogenerated addresses are in the range of 169.254.x.x. If your IP

address is in this range, check the connection from the computer to

the gateway and reboot your computer.

•

If your gateway’s IP address has been changed and you do not know the current IP

address, clear the gateway’s configuration to factory defaults. This sets the gateway’s IP

address to 192.168.0.1. For more information, see

Factory Default Settings

on page

54

.

•

Make sure that your browser has Java, JavaScript, or ActiveX enabled. If you are using

Internet Explorer, click

Refresh

to make sure that the Java applet is loaded.

•

Try quitting the browser and launching it again.

•

Make sure that you are using the correct login information. The gateway user name is

admin,

and

the default password is

password

, both in lower case letters. (Caps Lock

should be off when you enter these.)

If the gateway does not save changes you have made, check the following:

•

When entering configuration settings, be sure to click the

Apply

button before moving to

another screen, or your changes are lost.

•

Click the

Refresh

or

Reload

button in the web browser. The changes might have

occurred, but the web browser might be caching the old configuration.

T

roubleshoot the ISP Connection

If your gateway is unable to access the Internet and your Internet LED is on, you might need

to register the cable MAC address or device MAC address of your gateway with your cable

service provider.

Additionally, your computer might not have the gateway configured as its TCP/IP gateway. If

your computer obtains its information from the gateway by DHCP, reboot the computer and

verify the gateway address. For more information, see

Reserve an IP Address for DHCP Use

on page

44.

T

roubleshoot a TCP/IP Network Using a Ping Utility

Most TCP/IP terminal devices and routers contain a ping utility that sends an echo request

packet to the designated device. The device then responds with an echo reply. You can