I need some help with a strange new problem - a persistent missing ARP entry.

We are a Cisco shop running WiSMs (6.0.199.4) with a mix of 1142s, 1131's and a 
few older 1242 APs.

This past Friday we got a report of 5 XP tablets that could not use the 
wireless network. These are 5 out of a group of 50 handheld tablets used in our 
hospital by the doctors for charting, etc. All of these are imaged and should 
be using the same image (and later reimaged to be sure). It turns out that that 
these five machines can use every SSID on campus except for one - their special 
one which uses WEP (no flames about WPA; we have tried to get them to move, but 
they are doctors and know more than anyone else). Further investigation has 
shown that these five machines never get an ARP entry built for their default 
gateway. They can talk to other machines on their subnet, but nothing outside. 
When a manual ARP entry is built for them, they are fine. This problem has 
persisted across reboots and reimaging of these five machines.

Today we have received reports of other machines on campus who have similar 
symptoms (we have yet to actually see one of them). They lose connectivity on 
one SSID but are OK on all others.

Has anyone else seen this? Can you give me a clue what to look for?


Along with the MAC address strangeness, which we are seeing, this problem has 
made for a very interesting few days.

Thanks for any help you can offer.


-jcw                         [cid:image002.jpg@01CB5E62.A701A560]

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John Watters    The University of Alabama: OIT  205-348-3992


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