Specifications

OmniAccess Reference: AOS-W System Reference
590 Part 031652-00 May 2005
Specific Probe Request – In this type of probe-request, the client is only
interested in one particular ESSID. It will include this ESSID in the request, and
only APs supporting this ESSID will respond.
It is possible in an Alcatel deployment to disable responses to broadcast
probe-requests, and require a specific probe-request with the correct ESSID
before an AP will answer. If a client does not find an AP to associate with,
there are a number of possible causes.
A packet capture of a normal probe-request/probe-response sequence is
shown in the figure below. Detailed packet capture data can be found in
Appendix A.
FIGURE 27-2 Network Discovery
Client’s list of available networks is empty
Consider the following possible fixes:
z Ensure that the user is physically located in an area with AP coverage.
Sometimes wireless LANs are deployed only in certain parts of a building.
The user may not be aware of this fact, and may be reporting a problem
when there is none.
z Make sure the client’s wireless adapter is enabled. Some newer laptops
with built-in wireless hardware have a physical switch that enables and dis-
ables the radio. NIC client utilities often contain similar software switches.
Finally, the adapter may be disabled by the operating system.
z If responses to broadcast probe-requests have been disabled in the Alcatel
network, ensure that the client has been configured with the proper ESSID.
If the ESSID is incorrect, the client will not be able to locate any APs.
Ala Net: 9D:65:E0
Ala Net: 80:A6:00
Ala Net: 9D:65:E0