HIGH NOISE 5GHZ

[sambobbi]

Recently, we have received complaints from customers regarding slow wifi in a specific section of the floor. Upon checking in Cisco DNAC, I found that the WAP the client is connected to is showing high noise on the 5GHz spectrum. I changed the nearby WAP into sniffer mode to capture the traffic on the same channel as the WAP with high noise. I now have the packet capture in Wireshark, but I'm unsure of how to diagnose the problem. I tried searching for a solution to this problem on Google but didn't find anything useful. Can you please guide me in the right direction?

I have temporarily disabled the problematic WAP and plan to conduct spectrum analysis at a later stage. In the meantime, I would like to review the packet capture to see if it can provide any useful information. Are there any troubleshooting steps that I can perform from the WLC for the WAP 2802i model in use?

[Leo Laohoo]

The only way to determine is to get an Ekahau Sidekick and walk the area.  

[Dustin Anderson]

Noise may not be traffic, but something in the same frequency range causing interference. so there may not be anything in the packet capture. you need something that can scan the frequencies for what is causing the interference. As Leo mentioned, the Ekahau sidekick can do it, but if you don't have it, it's an expensive option.

Metageek has chanalyzer that uses Wi-Spy device to scan. This still is not cheap, but considering Ekahau is 12K to buy and around $1500/year for licensing, the 1K for Metageek and the wi-spy works if you need something small.