Wireless clients wont pick up a new IP address

[ChrisH]

I've got a bit of a head scratcher here. Setup:

 

Ruckus + Zone Director

Domain joined laptops

Settings via GPO, certificate and RADIUS

 

It seems in one area of the building the laptops will not pick up an IP address if there isn't already one listed under address leases.

If it already has an IP under address leases it will work.

If I reserve an IP address it will work.

There are plenty of IP addresses in the pool.

If there are no entries at all wireshark shows the client never getting past DHCP discover.

The wired clients have no trouble getting and IP address on the same switches.

This works fine on other APS.

If I get an IP address at another AP and switch on at the affected AP area it will work fine.

All APs are configured the same.

I have double checked the switch config against other switches and they are fine. Tagged in the two VLANs for the wireless and untagged in the default VLAN. All uplinks tagged accordingly (Procurve terminology)

This was working up until recently.

No activity from clients in the DHCP server log.

Everything that can be restarted has been restarted.

Swapped the AP with a known working one but still same issue.

The clients definitely join the wireless network every time I have confirmed this via the Zone Director.

 

That last one points to a network issue but with the other things that do work it's doesn't seem to be that straight forward. I'm going to start mirroring ports of the AP, then the uplink and the other end of the fibre to see what I can see.

 

Any suggestions in the meantime?

[ChrisH]

I managed to get round to this today finally. It turns out that the AP in question was 100 % working and the switch was configured correctly. What strange behaviour was happening though is the laptops were all connecting to the AP on the floor above and two rooms over rather than the AP that was 3 feet away! The one upstairs is servicing a department who hadn't used their laptops recently so they hadn't noticed it wasn't working due to the switch config being missing (must not have wrote the changes to memory and they must have been switched off at some point). So if I turned the misconfigured one off and they connected to the correct one and worked first time. Changed the upstairs switch config and now they are all working but it seems to connect to the one upstairs first and then roam back to the local one! Anyway working for now. I would never have figured it out without the management system! Edited February 6, 2015 by ChrisH