Zyxel NBG-418N Router Manual PDF (Setup & Configuration Guide)

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NBG-418N User’s Guide

141

C

HAPTER

20

Troubleshooting

This chapter offers some suggestions to solve problems you might encounter. The potential

problems are divided into the following categories.

•

Power, Hardware Connections, and LEDs

•

NBG-418N Access and Login

•

Internet Access

•

Resetting the NBG-418N to Its Factory Defaults

•

Wireless Problems

20.1

Power, Hardware Connections, and LEDs

The NBG-418N does not turn on. None of the LEDs turn on.

1

Make sure you are using the power adaptor or cord included with the NBG-418N.

2

Make sure the power adaptor or cord is connected to the NBG-418N and plugged in to an

appropriate power source. Make sure the power source is turned on.

3

Disconnect and re-connect the power adaptor or cord to the NBG-418N.

4

If the problem continues, contact the vendor.

One of the LEDs does not behave as expected.

1

Make sure you understand the normal behavior of the LED. See

Section 1.3 on page 15

.

2

Check the hardware connections. See the Quick Start Guide.

3

Inspect your cables for damage. Contact the vendor to replace any damaged cables.

4

Disconnect and re-connect the power adaptor to the NBG-418N.

5

If the problem continues, contact the vendor.

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Chapter 20 Troubleshooting

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20.2

NBG-418N Access and Login

I don’t know the IP address of my NBG-418N.

1

The default IP address in router mode is

192.168.1.1

and in non-router mode is

192.168.1.2

.

2

If you changed the IP address and have forgotten it, you might get the IP address of the NBG-418N

by looking up the IP address of the default gateway for your computer. To do this in most Windows

computers, click

Start > Run

, enter

cmd

, and then enter

ipconfig

. The IP address of the

Default

Gateway

might be the IP address of the NBG-418N (it depends on the network), so enter this IP

address in your Internet browser.Set your device to

Router Mode

, login (see the Quick Start Guide

for instructions) and go to the

Device Information

table in the

Status

screen. Your NBG-418N’s

IP address is available in the

Device Information

table.

•

If the

DHCP

setting under

LAN information

is

None

, your device has a fixed IP address.

•

If the

DHCP

setting under

LAN information

is

Client

, then your device receives an IP

address from a DHCP server on the network.

3

If your NBG-418N is a DHCP client, you can find your IP address from the DHCP server. This

information is only available from the DHCP server which allocates IP addresses on your network.

Find this information directly from the DHCP server or contact your system administrator for more

information.

4

Reset your NBG-418N to change all settings back to their default. This means your current settings

are lost. See

Section 20.4 on page 144

in the

Troubleshooting

for information on resetting your

NBG-418N.

I forgot the username and password.

1

The default username is

admin

and default password is

1234

.

2

If this does not work, you have to reset the device to its factory defaults. See

Section 20.4 on page

144

.

I cannot see or access the

Login

screen in the Web Configurator.

1

Make sure you are using the correct IP address.

•

The default IP address is 192.168.1.1 (router mode).

•

If you changed the IP address, use the new IP address.

•

If you changed the IP address and have forgotten it, see the troubleshooting suggestions for

I

don’t know the IP address of my NBG-418N.

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2

Check the hardware connections, and make sure the LEDs are behaving as expected. See the Quick

Start Guide.

3

Make sure your Internet browser does not block pop-up windows and has JavaScript and Java

enabled. See

Appendix B on page 157

.

4

Make sure your computer is in the same subnet as the NBG-418N. (If you know that there are

routers between your computer and the NBG-418N, skip this step.)

•

If there is a DHCP server on your network, make sure your computer is using a dynamic IP

address.

•

If there is no DHCP server on your network, make sure your computer’s IP address is in the

same subnet as the NBG-418N.

5

Reset the device to its factory defaults, and try to access the NBG-418N with the default IP address.

6

If the problem continues, contact the network administrator or vendor, or try one of the advanced

suggestions.

Advanced Suggestions

•

If your computer is connected to the

WAN

port or is connected wirelessly, use a computer that is

connected to a

LAN

/

ETHERNET

port.

I can see the

Login

screen, but I cannot log in to the NBG-418N.

1

Make sure you have entered the password correctly. The default username is

admin

and default

password is

1234

. This field is case-sensitive, so make sure [Caps Lock] is not on.

2

This can happen when you fail to log out properly from your last session. Try logging in again after

5 minutes.

3

Disconnect and re-connect the power adaptor or cord to the NBG-418N.

4

If this does not work, you have to reset the device to its factory defaults. See

Section 20.4 on page

144

.

20.3

Internet Access

I cannot access the Internet.

1

Check the hardware connections, and make sure the LEDs are behaving as expected. See the Quick

Start Guide.

2

Make sure you entered your ISP account information correctly in the wizard. These fields are case-

sensitive, so make sure [Caps Lock] is not on.

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Chapter 20 Troubleshooting

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3

If you are trying to access the Internet wirelessly, make sure the wireless settings in the wireless

client are the same as the settings in the AP.

4

Disconnect all the cables from your device, and follow the directions in the Quick Start Guide again.

5

Go to

Maintenance > Sys OP Mode > General

. Check your

System Operation Mode

setting.

6

If the problem continues, contact your ISP.

I cannot access the Internet anymore. I had access to the Internet (with the NBG-418N), but

my Internet connection is not available anymore.

1

Check the hardware connections, and make sure the LEDs are behaving as expected. See the Quick

Start Guide and

Section 1.3 on page 15

.

2

Reboot the NBG-418N.

3

If the problem continues, contact your ISP.

The Internet connection is slow or intermittent.

1

There might be a lot of traffic on the network. Look at the LEDs, and check

Section 1.3 on page 15

.

If the NBG-418N is sending or receiving a lot of information, try closing some programs that use

the Internet, especially peer-to-peer applications.

2

Check the signal strength. If the signal strength is low, try moving the NBG-418N closer to the AP if

possible, and look around to see if there are any devices that might be interfering with the wireless

network (for example, microwaves, other wireless networks, and so on).

3

Reboot the NBG-418N.

4

If the problem continues, contact the network administrator or vendor, or try one of the advanced

suggestions.

Advanced Suggestion

•

Check the settings for QoS. If it is disabled, you might consider activating it.

20.4

Resetting the NBG-418N to Its Factory Defaults

If you reset the NBG-418N, you lose all of the changes you have made. The NBG-418N re-loads its

default settings, and the username/password resets to

admin

/

1234

. You have to make all of your

changes again.

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Chapter 20 Troubleshooting

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You will lose all of your changes when you push the

RESET

button.

To reset the NBG-418N,

1

Make sure the power LED is on.

2

Press the

RESET

button for longer than 1 second to restart/reboot the NBG-418N.

3

Press the

RESET

button for longer than five seconds to set the NBG-418N back to its factory-

default configurations.

If the NBG-418N restarts automatically, wait for the NBG-418N to finish restarting, and log in to the

Web Configurator. The username is

admin

and password is

1234

.

If the NBG-418N does not restart automatically,

di

sconnect and reconnect the NBG-418N’s power.

Then, follow the directions above again.

20.5

Wireless Problems

I cannot access the NBG-418N or ping any computer from the WLAN.

1

Make sure the wireless LAN is enabled on the NBG-418N.

2

Make sure the wireless adapter on the wireless station is working properly.

3

Make sure the wireless adapter installed on your computer is IEEE 802.11 compatible and supports

the same wireless standard as the NBG-418N.

4

Make sure your computer (with a wireless adapter installed) is within the transmission range of the

NBG-418N.

5

Check that both the NBG-418N and your wireless station are using the same wireless and wireless

security settings.

6

Make sure traffic between the WLAN and the LAN is not blocked by the firewall on the NBG-418N.

7

Make sure you allow the NBG-418N to be remotely accessed through the WLAN interface. Check

your remote management settings.

•

See

Chapter 6 Wireless LAN

for more information.

I cannot access the Web Configurator after I switched to a non-router mode.

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