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Chapter 27 Troubleshooting
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296
Your WAN interface must enable VLAN and fill each WAN connection with different
VLAN IDs.
I cannot access the Internet anymore. I had access to the Internet (with the ZyXEL
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 1.6 on page 26
.
2
Turn the ZyXEL 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
1.6 on page 26
. If the ZyXEL Device is sending or receiving a lot of information,
try closing some programs that use the Internet, especially peer-to-peer
applications.
2
Turn the ZyXEL Device off and on.
3
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.
27.5
Wireless Internet Access
What factors may cause intermittent or unstabled wireless connection? How can I
solve this problem?
The following factors may cause interference:
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•
Obstacles: walls, ceilings, furniture, and so on.
•
Building Materials: metal doors, aluminum studs.
•
Electrical devices: microwaves, monitors, electric motors, cordless phones, and
other wireless devices.
To optimize the speed and quality of your wireless connection, you can:
•
Move your wireless device closer to the AP if the signal strength is low.
•
Reduce wireless interference that may be caused by other wireless networks or
surrounding wireless electronics such as cordless phones.
•
Place the AP where there are minimum obstacles (such as walls and ceilings)
between the AP and the wireless client.
•
Reduce the number of wireless clients connecting to the same AP
simultaneously, or add additional APs if necessary.
•
Try closing some programs that use the Internet, especially peer-to-peer
applications. If the wireless client is sending or receiving a lot of information, it
may have too many programs open that use the Internet.
•
Position the antennas for best reception. If the AP is placed on a table or floor,
point the antennas upwards. If the AP is placed at a high position, point the
antennas downwards. Try pointing the antennas in different directions and
check which provides the strongest signal to the wireless clients.
What is a Server Set ID (SSID)?
An SSID is a name that uniquely identifies a wireless network. The AP and all the
clients within a wireless network must use the same SSID.
What wireless security modes does my ZyXEL Device support?
Wireless security is vital to your network. It protects communications between
wireless stations, access points and the wired network.
The available security modes in your ZyXEL device are as follows:
•
WPA2-PSK:
(recommended) This uses a pre-shared key with the WPA2
standard.
•
WPA-PSK:
This has the device use either WPA-PSK or WPA2-PSK depending on
which security mode the wireless client uses.
•
WPA2:
WPA2 (IEEE 802.11i) is a wireless security standard that defines
stronger encryption, authentication and key management than WPA. It requires
the use of a RADIUS server and is mostly used in business networks.
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•
WPA:
Wi-Fi Protected Access (WPA) is a subset of the IEEE 802.11i standard. It
requires the use of a RADIUS server and is mostly used in business networks.
•
WEP:
Wired Equivalent Privacy (WEP) encryption scrambles the data
transmitted between the wireless stations and the access points to keep
network communications private.
27.6
Phone Calls and VoIP
The telephone port won’t work or the telephone lacks a dial tone.
1
Check the telephone connections and telephone wire.
I can access the Internet, but cannot make VoIP calls.
1
The
PHONE
light should come on. Make sure that your telephone is connected to
the
PHONE
port.
2
You can also check the VoIP status in the
System Info
screen.
3
If the VoIP settings are correct, use speed dial to make peer-to-peer calls. If you
can make a call using speed dial, there may be something wrong with the SIP
server, contact your VoIP service provider.
27.7
USB Device Connection
The ZyXEL Device fails to detect my USB device.
1
Disconnect the USB device.
2
Reboot the ZyXEL Device.
3
If you are connecting a USB hard drive that comes with an external power supply,
make sure it is connected to an appropriate power source that is on.
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4
Re-connect your USB device to the ZyXEL Device.
27.8
UPnP
When using UPnP and the ZyXEL Device reboots, my computer cannot detect
UPnP and refresh
My Network Places > Local Network
.
1
Disconnect the Ethernet cable from the ZyXEL Device’s LAN port or from your
computer.
2
Re-connect the Ethernet cable.
The
Local Area Connection
icon for UPnP disappears in the screen.
Restart your computer.
I cannot open special applications such as white board, file transfer and video
when I use the MSN messenger.
1
Wait more than three minutes.
2
Restart the applications.
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