Extreme Networks Altitude 4000 Series, Справочное руководство, Страница: 232 / 521

Chapter 7: Wireless Configuration
Altitude
TM
4000 Series Access Point System Reference Guide
232
5
Define Key Settings .
6 Define Key Rotation values.
Unicast messages are addressed to a single device on the network. Broadcast messages are addressed
to multiple devices. When using WPA2-CCMP, a wireless client can use 2 keys: one unicast key, for
its own traffic to and from an AP, and one broadcast key, the common key for clients in that subnet.
Extreme Networks recommends rotating these keys so a potential hacker would not have enough
data using a single key to attack the deployed encryption scheme.
Pre-Shared Key Enter either an alphanumeric string of 8 to 63 ASCII characters or 64
HEX characters as the primary string both transmitting and receiving
authenticators must share. The alphanumeric string allows character
spaces. The wireless controller converts the string to a numeric value.
This passphrase saves the administrator from entering the 256-bit key
each time keys are generated.
Unicast Rotation
Interval Define an interval for unicast key transmission in seconds (30 -86,400).
Some clients have issues using unicast key rotation, so ensure you know
which clients are impacted before using unicast keys. This value is
disabled by default.