Aruba Networks Version 3.3 ユーザーズマニュアル

| Design Guide

Mobility Controller Configuration |

Role assignment has many options under the umbrella of role derivation. While the system can simply 
use the role returned from the authentication server, it can also assign a role based on a number of 
attributes. When a user logs in using WPA2 they receive an open employee role, but when logging in 
with the same credentials using a captive portal, a reduced role is put into effect. Phones can share the 
same authentication as a camera but receive a different voice role after completing registration with a 
SIP server.

Due to the open nature of wireless networks they are prime targets for both unscrupulous individuals 
and casual hackers that happen to live in the area. To protect against unsanctioned wireless devices, 
use of Aruba’s Wireless Intrusion Detection System (WIDS) software module can automatically detect 
and defend against wireless attacks and “rogue” APs on the network. 

A common wireless network attack is called “man-in-the-middle.” During such an attack, a hacker 
masquerades as a legitimate AP using software on a laptop, and acting as a relay point, fools users and 
other APs into sending data through the laptop instead of the real AP. The attacker can then eavesdrop 
on conversations, modify or corrupt data, or run password-cracking routines. 

Aruba Access Points monitor the air to detect other wireless stations masquerading as valid APs. When 
masquerading is detected, appropriate defense mechanisms are put into place. Aruba Mobility 
Controllers also track unique “signatures” for every wireless client in the network, and if a new station 
is introduced claiming to be a particular client, but lacks a proper signature, a station impersonation 
attack is declared.