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Page 51 / 141 Scroll up to view Page 46 - 50
ZyXEL P-330W User’s Guide
51
Chapter 5 Wireless
5.4
Wireless Advanced Settings
Click
ADVANCED SETTINGS
to configure the advanced settings of your wireless LAN.
5.4.1
Authentication
Three different methods can be used to authenticate wireless stations to the network:
Open
System
,
Shared Key
, and
Auto
. The following figure illustrates the steps involved.
Figure 25
WEP Authentication Steps
Open system authentication involves an unencrypted two-message procedure. A wireless
station sends an open system authentication request to the AP, which will then automatically
accept and connect the wireless station to the network. In effect, open system is not
authentication at all as any station can gain access to the network.
Shared key authentication involves a four-message procedure. A wireless station sends a
shared key authentication request to the AP, which will then reply with a challenge text
message. The wireless station must then use the AP’s default WEP key to encrypt the
challenge text and return it to the AP, which attempts to decrypt the message using the AP’s
default WEP key. If the decrypted message matches the challenge text, the wireless station is
authenticated.
Page 52 / 141
ZyXEL P-330W User’s Guide
Chapter 5 Wireless
52
When your P-330W's authentication method is set to open system, it will only accept open
system authentication requests. The same is true for shared key authentication. However,
when it is set to auto authentication, the P-330W will accept either type of authentication
request and the P-330W will fall back to use open authentication if the shared key does not
match.
5.4.2
Preamble Type
A preamble is used to synchronize the transmission timing in your wireless network. There are
two preamble modes:
Long
and
Short
.
Short preamble takes less time to process and minimizes overhead, so it should be used in a
good wireless network environment when all wireless clients support it.
Select
Long
if you have a ‘noisy’ network or are unsure of what preamble mode your wireless
clients support as all IEEE 802.11b compliant wireless adapters must support long preamble.
However, not all wireless adapters support short preamble. Use long preamble if you are
unsure what preamble mode the wireless adapters support, to ensure interpretability between
the P-330W and the wireless stations and to provide more reliable communication in ‘noisy’
networks..
Figure 26
Wireless: Advanced Settings
The following table describes the advanced wireless LAN labels in this screen.
Note:
The P-330W and the wireless stations MUST
use the
same preamble mode in order to communicate.
Table 18
Wireless: Advanced Settings
LABEL
DESCRIPTION
Authentication
Type
Select Auto, Open System or Shared Key from the menu..
Preamble Type
Select a preamble type from the drop-down list menu. Choices are Long or Short.
The default setting is Long.
Page 53 / 141
ZyXEL P-330W User’s Guide
53
Chapter 5 Wireless
5.5
Site Survey
Click
Site Survey
to scan the wireless network. If any Access Point or IBSS is found, you
could choose to connect it when P330’s wireless mode is set to Client mode.
Figure 27
Wireless: Site Survey
5.6
Wireless Security Overview
Wireless security is vital to your network to protect wireless communication between wireless
stations, access points and the wired network.
The figure below shows the possible wireless security levels. EAP (Extensible Authentication
Protocol) is used for authentication and utilizes dynamic WEP key exchange. It requires
interaction with a RADIUS (Remote Authentication Dial-In User Service) server either on the
WAN or your LAN to provide authentication service for wireless stations.
Broadcast SSID
Select this to hide the SSID in the outgoing beacon frame so a station cannot obtain
the SSID through passive scanning using a site survey tool.
IAPP
Used in a multiple AP environment where 802.1x is used for authentication.
Save
Click
Save
to save your changes back to the P-330W.
Reset
Click
Reset
to reload the previous configuration for this screen.
Table 18
Wireless: Advanced Settings
LABEL
DESCRIPTION
Page 54 / 141
ZyXEL P-330W User’s Guide
Chapter 5 Wireless
54
Figure 28
P-330W Wireless Security Levels
If you do not enable any wireless security on your P-330W, your network is accessible to any
wireless networking device that is within range.
Select
NONE
for
Encryption
to allow wireless stations to communicate with the access
points without any data encryption.
Page 55 / 141
ZyXEL P-330W User’s Guide
55
Chapter 5 Wireless
Figure 29
Wireless Security Setup: No Security
The following table describes the labels in this screen.
Table 19
Wireless Security Setup: No Security
LABEL
DESCRIPTION
Encryption
Choose
None
from the drop-down list box.
Use 802.1x
Authentication
Mark this check box to enable 802.1x security using an external RADIUS server.
Data will not be encrypted, however wireless clients will be required to authenticate
before they are allowed to pass traffic to the network.
Both the client and the
RADIUS server will need to support the same EAP protocols.
Save
Click
Save
to save your changes back to the P-330W.
Reset
Click
Reset
to reload the previous configuration for this screen.

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