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When using multiple access points it is better if adjacent access points
use different channels to reduce interference The recommended channel
spacing between adjacent access points is five channels, e g , use Channels
1 and 6, or 6 and 11
•
In Infrastructure Mode wireless stations normally scan all channels looking
for an access point If more than one access point can be used, the one with
the strongest signal is used (This can only happen within an ESS )
•
If using Ad-hoc Mode (no access point) all wireless stations should be set
to use the same channel However, most wireless stations will still scan all
channels to see if there is an existing Ad-hoc group they can join
WEP
WEP (Wired Equivalent Privacy) is a standard for encrypting data before it is
transmitted This is desirable because it is impossible to prevent snoopers from
receiving any data which is transmitted by your wireless stations If the data is
encrypted, it is meaningless unless the receiver can decrypt it
If WEP is used, the wireless stations and the wireless access point must have the
same settings
WPA-PSK
In WPA-PSK, like WEP, data is encrypted before transmission WPA is more secure
than WEP The PSK (pre-shared key) must be entered on each wireless station
The 256-bitencryption key is derived from the PSK, and changes frequently
WPA2-PSK
This is a further development of WPA-PSK, and offers even greater security, using
the AES (Advanced Encryption Standard) method of encryption It should be
used if possible
WPA-Enterprise
This version of WPA requires a RADIUS server on your LAN to provide the
client authentica-tion according to the 802 1X standard Data transmissions are
encrypted using the WPA standard
Appendix B About Wireless LANs
If this option is used:
•
The access point must have a client login on the RADIUS server.
•
Each user must have a user login on the RADIUS server.
•
Each user's wireless client must support 802.1X and provide the login data
when required
All data transmission is encrypted using the WPA standard Keys are automatically
generated, so no key input is required
WPA2-Enterprise
This version of WPA2 requires a RADIUS server on your LAN to provide the client
authentication according to the 802 1X standard Data transmissions are encrypted
using the WPA2 standard
If this option is used:
•
The access point must have a client login on the RADIUS server.
•
Each user must have a user login on the RADIUS server.
•
Each user's wireless client must support 802.1X and provide the login data
when required
All data transmission is encrypted using the WPA2 standard Keys are automatically
generated, so no key input is required
802.1x
This uses the 802 1X standard for client authentication, and WEP for data encryption
If possible, you should use WPA-Enterprise instead, because WPA encryption is
much stronger than WEP encryption
If this option is used:
•
The access point must have a client login on the RADIUS server.
•
Each user must have a user login on the RADIUS server.
•
Each user's wireless client must support 802.1X and provide the login data
when required
•
All data transmission is encrypted using the WEP standard. You only have to
select the WEP key size; the WEP key is automatically generated
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