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654
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20
Helpful
8
Replies

troubleshoot wifi clients disconnection

Andrey128
Level 1
Level 1

what is the approach to troubleshoot disconnection of a user's laptop?

Wifi infrastructure is built on access points 2702I with WLC5508 (firmware 8.3), laptop is using only 5 Ghz (connected via "802.11ac") connection (2.4 Ghz is disabled on access points), clean air shows 98-99 quality of used channel, prime system show not bad RSSI and SNR (today, october 25 disconnection was reported):

wifi.png

why such sudden disconnection may happen?

1) someone may send disassociation management frames to access point(s)?!

2) fluctuation of a signal where laptop is located (prime building provided graph based on some average values, which may not show RSSI&SNR fast fluctuations)

3) problems with driver on laptop?

 

8 Replies 8

balaji.bandi
Hall of Fame
Hall of Fame

If this was running from ages and suddenly you see this issue, i suspect something might have changed recently.

if this is new setup you have issue from the beginning, start with Site survey and some debugging and wireshark captures will help.

 

BB

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I also think that something which influence signal spread may happen around, as per following feedback about the problem "last weeks have been ok, and only the last few days have been bad"

Leo Laohoo
Hall of Fame
Hall of Fame
What is the exact firmware?
What kind of wireless NIC is this and what is the wireless NIC driver version?

firmware on controller: 8.3.141.0

NIC is "Intel(R) Dual Band Wireless-AC 7265", I could not get driver version, I assume 3-4 releases from latest one.

I'd upgrade the wireless NIC drivers (LINK) first.

yes, that I assume was done yesterday, will observe the result

Andrey128
Level 1
Level 1

here is ping time from that computer to gateway of VLAN where it is located:

time=3ms
time=4ms
time=6ms
time=9ms
time=3ms
time=3ms
time=3ms
time=160ms
time=9ms
time=8ms
time=123ms
time=4ms
time=14ms
time=5ms
time=7ms
time=7ms
time=4ms
time=4ms
time=7ms
time=10ms
time=2ms
time=18ms
time=4ms
time=4ms
time=4ms
time=7ms
time=15ms
time=10ms
time=9ms
time=16ms
time=7ms
time=5ms
time=6ms
time=2ms
time=9ms
time=10ms
time=9ms
time=9ms
time=8ms
time=7ms
time=8ms
time=9ms
time=7ms
time=6ms
time=5ms
time=4ms
time=4ms
time=10ms
time=4ms
time=3ms
time=8ms
time=14ms
time=9ms
time=16ms
time=5ms
time=10ms
time=7ms
time=8ms
time=6ms
time=189ms
time=4ms

that might be due to amount of users, which are sharing access point? its about ~20-30 clients.

that is normal, but if you look at off peak and compare the results.

 

as long as your wifi not dropping and apps are working as expected, its good.

 

 

BB

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