Zyxel NBG-418N v2 Router Manual PDF (Setup & Configuration Guide)

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NBG-418N v2 User’s Guide

151

C

HAPTER

23

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 v2 Access and Login

•

Internet Access

•

Resetting the NBG-418N v2 to Its Factory Defaults

•

Wireless Problems

23.1

Power, Hardware Connections, and LEDs

The NBG-418N v2 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 v2.

2

Make sure the power adaptor or cord is connected to the NBG-418N v2 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 v2.

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 13

.

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 v2.

5

If the problem continues, contact the vendor.

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152

23.2

NBG-418N v2 Access and Login

I don’t know the IP address of my NBG-418N v2.

1

The default web address in

Router Mode

is http://myrouter.

2

The default IP address in router mode is

192.168.1.1

and in non-router mode is

192.168.1.2

.

3

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

v2 in

Router Mode

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 v2 (it depends on the

network), so enter this IP address in your Internet browser.

4

Reset your NBG-418N v2 to change all settings back to their default. This means your current

settings are lost. See

Section 23.4 on page 154

in the

Troubleshooting

for information on

resetting your NBG-418N v2.

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 23.4 on page

154

.

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 v2.

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 166

.

4

Make sure your computer is in the same subnet as the NBG-418N v2. (If you know that there are

routers between your computer and the NBG-418N v2, skip this step.)

•

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

address.

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Chapter 23 Troubleshooting

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153

•

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 v2.

5

Reset the device to its factory defaults, and try to access the NBG-418N v2 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 v2.

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 v2.

4

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

Section 23.4 on page

154

.

23.3

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.

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.

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I cannot access the Internet anymore. I had access to the Internet (with the NBG-418N v2),

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 13

.

2

Reboot the NBG-418N v2.

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 13

.

If the NBG-418N v2 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 v2 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 v2.

4

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

suggestions.

23.4

Resetting the NBG-418N v2 to Its Factory Defaults

If you reset the NBG-418N v2, you lose all of the changes you have made. The NBG-418N v2 re-

loads its default settings, and the username/password resets to

admin

/

1234

. You have to make all

of your changes again.

You will lose all of your changes when you push the

WPS/RESET

button.

To reset the NBG-418N v2,

1

Make sure the power LED is on.

2

Press the

WPS/RESET

button for longer than 10 second to reboot and restore factory-default

configurations on the NBG-418N v2.

If the NBG-418N v2 restarts automatically, wait for the NBG-418N v2 to finish restarting, and log in

to the Web Configurator. The username is

admin

and password is

1234

.

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Chapter 23 Troubleshooting

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If the NBG-418N v2 does not restart automatically,

di

sconnect and reconnect the NBG-418N v2’s

power. Then, follow the directions above again.

23.5

Wireless Problems

I cannot access the NBG-418N v2 or ping any computer from the WLAN.

1

Make sure the wireless LAN is enabled on the NBG-418N v2.

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 v2.

4

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

NBG-418N v2.

5

Check that both the NBG-418N v2 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

v2.

7

Make sure you allow the NBG-418N v2 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.

When you change from router mode to a non-router mode, you must manually give your computer

an IP address in the range between 192.168.1.3 and 192.168.1.254 as non-router mode has no

LAN DHCP server.

Refer to

Appendix C on page 175

for instructions on how to change your computer’s IP address.

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