I have an issue where my wireless clients will sporadically not be able to connect to the LAN at random intervals. I have a mix of windows, mac, iOS, and android devices that all have the issue. When one unit is having the issue, the others do not (very random). Here is my setup:
WLC2106 >TRUNK> Meraki MS220 >ACCESS> 2x 1142n APs. My router for all my VLANs is Meraki MX60 (also connected to MS220).
My wireless clients are on their own VLAN, APs on their own, and mgmt for the WLC is on its own. The ap-manager interface for the WLC is on the same VLAN as the APs performing layer 2 discovery.
When this has occurred, I have run a packet capture on the connection between my switch and router. In this capture, I see the following repeated multiple times:
Troubled client mac in example is e8:4e:84:ff:b4:03
(This is from an old capture, before I changed some networking so I put place holders for the IPs. Unfortunately, it fixed before I could re-capture. Result has been the same before and after)
It looks like they are ARPing for each other but never get there. Again, this happens at sporadic times and I cannot find any correlation. I can make the client gain immediate access if I disconnect and reconnect to the WLAN. Or it typically resolves itself after about 20-30 minutes.
I've been banging my head against the wall with this for a few weeks. Any help would help this headache go away.
Controller was running 22.214.171.124. I just downgraded while writing this to 126.96.36.199 and will see if it happens in this version.
I ended up downgrading the controller to a different version (cannot recall off the top of my head but still 7.0). It hasn't happened in the past few days. Leo Laohoo, here are the answers to your questions:
1. What kind of wireless client(s)? Specify the hardware? (Smartphones, tablets, laptops)
iPad 3rd gen
Samsung Galaxy Tab 10.1 (2014 edition)
Lenovo T440 (intel AC-7260)
Dell E6410 (intel chip, not sure of part number)
2. How is the signal strength when this issue occurs? Measure both sides (AP to client and Client to AP)
When it last happened, it was in the 60-80 range.
3. What radio are the clients trying to get in? a or b?
Looking at the client list I see a mix of A/G
4. What happens if you have open authentication?
Haven't tried this one yet. The area that this is in has a large amount of foot traffic. If the issue occurs again, I will make another SSID and not broadcast
It turns out that I've been having this issue at another location as well with a 2500 series controller however it occurs MUCH much less.
Transferring Crash file from standby:
Login to the Active WLC in HA.
(Cisco Controller) >transfer upload datatype crash
(Cisco Controller) >transfer upload filename <Desired filename>
(Cisco Controller) >transfer up...
This is the start of a display filter cross reference between Wireshark and OmniPeek.
The 1st installment is a table of advanced filters. More filters will be added as time allows.
It is a living doc, so check back for changes every so often
Please feel ...
I have created a Powershell script to automatically add a Wireless Guest User on Cisco WLCs. (tested on 2500 Series)
The script should be completely self explanatory.
Powershell SNMP Module (Install-Module -Name SNMP)
SNMP Write Access to...