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6. Web Management - Wireless
The UMG-2000 / UMG-2200 wireless suite integrates the following services: standard
access point (AP), multiple layers of wireless security and client blocking.
STANDARD WIRELESS ACCESS POINT
The UMG-2000 / UMG-2200 supports three task groups in 802.11 standard working groups:
802.11b/g/n. 802.11b supports data rates up to 11 Mbps, 802.11g supports data rates of at
least 20 Mbps and 802.11n supports up to 300Mbps / 2T3R.
ENCRYPTION and Security
A wireless client will connect and join the network if no encryption is enabled. However, the
encryption greatly enhances the security of the connection and data transmission between
the access point and the wireless client. This includes the IEEE 802.1x port-based
authentication protocol, Wireless Protected Access (WPA),Wireless Protected
Access –version 2 (WPA2,) Wireless Encryption Protocol (WEP). If WEP is chosen as the
encrypt method, each packet is composed of the 24 bits Initialization vector and 40/104 bits
encryption. Therefore, WEP encrypt length will be 64bits or 128 bits. WEP uses the RC4
stream encryption (a fresh key stream for each package). WEP, with minimal flaws, is
enough to prevent most hacking. At the same time, WEP will cause often a 20-50%
reduction of the wireless speed. WPA is an interim solution until the 802.11i comes out. It
also uses the RC4 with the key changed to TKIP. TKIP works by generating a sequence of
WEP keys based on a master key and re-keying periodically.
CLIENT BLOCKING
The wireless is the opening network system for the wireless clients and any authenticated
clients can access the Wireless LAN (WLAN). However, the wireless AP can monitor the
status of the connected clients and set access limitation to the clients. To temporarily block
client access, the administrator can add the client MAC to the clock list. The client cannot
connect to the AP unless the administrator releases the blocking.
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