3Com 3CRWE870075A User Guide - Page 37

Security

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I RTS Threshold (0-2347)-Set the RTS (Request to Send) frame length. You may configure the access point to initiate an RTS frame sequence always, never, or only on frames longer than a specified length. If the packet size is smaller than the preset RTS threshold size, the RTS/CTS mechanism will not be enabled. The access point sends RTS frames to a particular receiving station to negotiate the sending of a data frame. After receiving an RTS frame, the station sends a CTS (Clear to Send) frame to acknowledge the right of the sending station to send data frames. The access points contending for the medium may not be aware of each other. The RTS/CTS mechanism can solve this hidden node problem. (Default: 2346) I Preamble Setting (802.11b only)-IEEE 802.11 frames begin with an alternating pattern of 1s and 0s called the preamble, which tells receiving stations that a frame is arriving. This provides time for the receiving station to synchronize to the incoming data stream. Enabling the Short preamble can boost your throughput; however, this can cause interoperability issues. (Default: Long) SECURITY The Security page allows you to set up lower-layer client authentication and data encryption parameters as described below. When you are finished configuring items on this page, click Apply. CONFIGURING AUTHENTICATION Three types of authentication can be configured: I Open System (the default)-Allows access to everyone. I Shared Key-If Shared Key is enabled, Encryption must also be enabled as described in "Configuring Encryption" on page 38. I 128-Bit Dynamic Security Link-This option can only be used with other 3Com Wireless LAN devices. It is the highest level of security, requiring a user name and password to access the wireless LAN. The user name and password set up on the access point must match those set up on the clients. Each network session creates a unique, one-time encryption code. To enable 128-bit Dynamic Security Link authentication, follow these steps: 1 Select 128-bit Dynamic Security Link. 2 Decide whether to require Windows user authentication: 37

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37
■
RTS Threshold (0-2347)
—Set the RTS (Request to Send) frame length. You
may configure the access point to initiate an RTS frame sequence always,
never, or only on frames longer than a specified length. If the packet size is
smaller than the preset RTS threshold size, the RTS/CTS mechanism will not
be enabled.
The access point sends RTS frames to a particular receiving station to
negotiate the sending of a data frame. After receiving an RTS frame, the
station sends a CTS (Clear to Send) frame to acknowledge the right of the
sending station to send data frames. The access points contending for the
medium may not be aware of each other. The RTS/CTS mechanism can solve
this hidden node problem. (Default: 2346)
■
Preamble Setting (802.11b only)
—IEEE 802.11 frames begin with an
alternating pattern of 1s and 0s called the preamble, which tells receiving
stations that a frame is arriving.
This provides time for the receiving station to
synchronize to the incoming data stream.
Enabling the Short preamble can
boost your throughput; however, this can cause interoperability issues.
(Default: Long)
S
ECURITY
The Security page allows you to set up lower-layer client authentication and data
encryption parameters as described below. When you are finished configuring
items on this page, click
Apply.
C
ONFIGURING
A
UTHENTICATION
Three types of authentication can be configured:
■
Open System
(the default)—Allows access to everyone.
■
Shared Key
—If Shared Key is enabled, Encryption must also be enabled as
described in “Configuring Encryption” on page 38.
■
128-Bit Dynamic Security Link
—This option can only be used with other
3Com Wireless LAN devices. It is the highest level of security, requiring a user
name and password to access the wireless LAN. The user name and password
set up on the access point must match those set up on the clients. Each
network session creates a unique, one-time encryption code.
To enable 128-bit Dynamic Security Link authentication, follow these steps:
1
Select
128-bit Dynamic Security Link.
2
Decide whether to require Windows user authentication: