Zyxel P-870HN-51b Router Manual PDF (Setup & Configuration Guide)

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P-870HN-51b User’s Guide

271

C

HAPTER

27

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

•

Device Access and Login

•

Internet Access

•

Wireless LAN Troubleshooting

27.1

Power, Hardware Connections, and LEDs

The Device does not turn on. None of the LEDs turn on.

1

Make sure the Device is turned on.

2

Make sure you are using the power adaptor or cord included with the Device.

3

Make sure the power adaptor or cord is connected to the Device and plugged in to

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

4

Turn the Device off and on.

5

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 1.5 on

page 24

.

2

Check the hardware connections. See the Quick Start Guide.

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3

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

cables.

4

Turn the Device off and on.

5

If the problem continues, contact the vendor.

27.2

Device Access and Login

I forgot the IP address for the Device.

1

The default IP address is

192.168.1.1

.

2

If you changed the IP address and have forgotten it, you might get the IP address

of the Device 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 Device (it depends on the network), so enter this IP address in your

Internet browser.

3

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

Section 1.6 on page 25

.

I forgot the password.

1

The default password is

1234

.

2

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

Section 1.6 on page 25

.

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

.

• If you changed the IP address (

Section

on page 107

), use the new IP

address.

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

suggestions for

I forgot the IP address for the Device.

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

JavaScripts and Java enabled. See

Appendix B on page 313

.

4

Reset the device to its factory defaults, and try to access the Device with the

default IP address. See

Section 1.6 on page 25

.

5

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

of the advanced suggestions.

Advanced Suggestions

•

If your computer is connected wirelessly, use a computer that is connected to a

ETHERNET

port.

I can see the

Login

screen, but I cannot log in to the Device.

1

Make sure you have entered the user name and password correctly. The default

user name is

admin

and password is

1234

. These fields are case-sensitive, so

make sure [Caps Lock] is not on.

2

Turn the Device off and on.

3

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

Section 27.1 on page 271

.

27.3

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 and

Section 1.5 on page 24

.

2

Make sure you entered your ISP account information correctly in the WAN screens.

These fields are case-sensitive, so make sure [Caps Lock] is not on.

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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

If the problem continues, contact your ISP.

I cannot access the Internet anymore. I had access to the Internet (with the

Device), 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 1.5 on page 24

.

2

Turn the Device off and on.

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

1.5 on page 24

. If the Device 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 your computer

closer to the Device 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

Turn the Device off and on.

4

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

of the advanced suggestions.

Advanced Suggestions

•

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

is enabled, you might consider raising or lowering the priority for some

applications.

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I cannot connect to the Internet using a second DSL connection.

ADSL and VDSL connections cannot work at the same time. You can only use one

type of DSL connection, either ADSL or VDSL connection at one time.

I cannot create multiple connections of the same type.

Your layer-2 interface must be in VLAN MUX Mode to create multiple WAN services

for each connection.

27.4

Wireless LAN Troubleshooting

I cannot access the Device or ping any computer from the WLAN (wireless AP or

router).

1

Make sure the wireless LAN is enabled on the Device.

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 Device.

4

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

transmission range of the Device.

5

Check that both the Device 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 Device.

7

Make sure you allow the Device to be remotely accessed through the WLAN

interface. Check your remote management settings.

•

See

Chapter 7 Wireless LAN

in the User’s Guide for more information.

8

Check if MAC Filter is configured to deny wireless access to certain MAC addresses

to the Device.

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