We have approx. 40 Aironet 1100 APs for student use. We are having a group of students have connection issues, and the common element is that they have either a Compaq or HP laptop. I have recently upgraded all of the APs to 12.2(13)JA3, and we are still having the problem. The students seem to have a good signal, but traffic is very unreliable.
I have a Vircom Radius server that does MAC address authentication. No WEP. On some of the machines, we have even installed external Linksys USB wireless network adapters, and the problems are still showing up, although reportadely, not as bad.
It is a little difficult to describe because it is intermittant. Basically, we have noticed on pretty much all Comapq laptops (usually Presario 2100) that our students will sometime lose their wireless conneciton for a few seconds, and then it comes back up. It seems to be more of an issue when they are not extremely close to one of the APs, but not too far where it should be a problem.
One other thing that we seem to see is that the speed will frequently fluxuate between 1.0 and 11.0, even when they are fairly close to the AP. I just figured that seeing most of the problems are on the same brand of PC, that something had to be up.
Basically, the signal is just not reliable. The only tests that I have run so far have been some ping tests to test connectivity, and quite a few of the pings are dropped.
I have Ethereal that I could use to capture some traffic from the offending machines.
Let me know if you have any more questions. We have advised our students that we are working on the issue.
I have the same problem with my AP 350. It all started after the upgrade to IOS. None of my Orinoco card will hold an assocation long. They keep dying with max retries exceeded. Unless I'm right next to the AP, the rate drops to 1Mbs. My Cisco radio card does better, but even it looses it's association. Again, this did not happen when I was running VxWorks, only since upgrading to IOS.
I just updated again last night to 12.2(15) with no change. Ugh...
We are having the same exact problem. We are running 12.2(13)JA3 and all laptops that have built in wireless are having problems connecting to the 1100. But any laptop that has a Cisco card in it works just fine. Any ideas?