Concept of the association and authentication?

Hello, hope someone can enlighten me on that.  We have a WLC 5508 with some WAP (1131 and 1242).  Our wireless clients using Basic authentication against our AD certificate (i.e. the computer cert and cert user are required).  However, from time to time I see customers being linked but not authenticated as reported by the WLC.  Would it be possible, as indicated by some literature that a customer can be "associated with" after it is successfully authenticated?  Maybe I'm not quite clear on the concept.  Thanks in advance.

Eric

Hi Eric,.

Clear as mud isn't

I like to think of it that way, in the library on our campus

There are hundreds of students more use laptop computers. If we look at the AP

in this area, we could see 120 Associations for example, but we can only see 65

Authentications. In this case are associated with laptops 55 users but not gone

through the authentication process.

Here is the explanation of Cisco;

The Wireless Client Association

In the process of customer binding, access points send tags announcing one or more SSID, flow of data and other information. The client sends a probe and scans all channels and listening responses to probes from the access roads and tags. The customer joins AP that has the strongest signal. If the signal becomes weak, the client repeats the scan to associate with another access point (this process is called roaming). During the association, the SSID, MAC address, and security settings are sent from the client to the access point and verified by the access point. Figure 3-6 illustrates the process of customer liaison.

Figure 3-6 Association of the customer

Association of the wireless to a selected access point client actually is the second step in a two-step process. First of all, authentication, then association must occur before a 802.11 client can pass traffic through the access point to another host on the network. The authentication of the client in this initial process is not the same as the network authentication (enter username and password for access to the network). The client authentication is simply the first step (followed by association) between the wireless client and the access point, and it establishes communication. The 802.11 standard specifies that two different authentication methods: open authentication and shared key authentication. Open authentication is simply the exchange of four packages of type "hello" without verification of client or access, to allow ease of connectivity. Shared key authentication uses a key defined static WEP, known between the client and access point, for verification. This same key might or might not be used to encrypt the data passing between a wireless client and an access point according to the configuration of the user.

http://www.CiscoPress.com/articles/article.asp?p=1156068&seqNum=3

See you soon!

Rob

Tags: Cisco Wireless

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