ZyXEL M-102 User Guide - Page 31

Authentication Type, Preamble Type

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Figure 11 WPA with RADIUS Application Example ZyXEL M-102 User's Guide 2.3 Authentication Type The IEEE 802.11b/g standard describes a simple authentication method between the wireless stations and AP. Three authentication types are defined: Auto Switch, an Open system mode and a Shared key mode. • Open system mode is implemented for ease-of-use and when security is not an issue. The wireless station and the AP do not share a secret key. Thus the wireless stations can associate with any AP and listen to any data transmitted plaintext. • Shared key mode involves a shared secret key to authenticate the wireless station to the AP. This requires you to enable the wireless LAN security and use same settings on both the wireless station and the AP. • Auto Switch authentication mode allows the M-102 to switch between the open system and shared key modes automatically. Use the auto mode if you do not know the authentication mode of the other wireless stations. 2.4 Preamble Type Preamble is used to signal that data is coming to the receiver. Short preamble increases performance as less time sending preamble means more time for sending data. All IEEE 802.11b/g compliant wireless adapters support long preamble, but not all support short preamble. Select Auto to have the M-102 automatically use short preamble when access point or wireless stations support it; otherwise the M-102 uses long preamble. Note: The M-102 and the access point/wireless stations MUST use the same preamble mode in order to communicate. Chapter 2 Wireless LAN Network 31

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ZyXEL M-102 User’s Guide
Chapter 2 Wireless LAN Network
31
Figure 11
WPA with RADIUS Application Example
2.3
Authentication Type
The IEEE 802.11b/g standard describes a simple authentication method between the wireless
stations and AP. Three authentication types are defined:
Auto Switch
, an
Open
system mode
and a
Shared
key mode.
•
Open
system
mode is implemented for ease-of-use and when security is not an issue.
The wireless station and the AP do
not
share a secret key. Thus the wireless stations can
associate with any AP and listen to any data transmitted plaintext.
•
Shared
key
mode involves a shared secret key to authenticate the wireless station to the
AP. This requires you to enable the wireless LAN security and use same settings on both
the wireless station and the AP.
•
Auto Switch
authentication mode allows the M-102 to switch between the open system
and shared key modes automatically. Use the auto mode if you do not know the
authentication mode of the other wireless stations.
2.4
Preamble Type
Preamble is used to signal that data is coming to the receiver.
Short preamble increases performance as less time sending preamble means more time for
sending data. All IEEE 802.11b/g compliant wireless adapters support long preamble, but not
all support short preamble.
Select
Auto
to have the M-102 automatically use short preamble when access point or
wireless stations support it; otherwise the M-102 uses long preamble.
Note:
The M-102 and the access point/wireless stations MUST use the same
preamble mode in order to communicate.