Dropped packets

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  • Updated 3 years ago
Having frequent dropped packets - using ZD 1100 and 2x 7982 APs. Clients use Citrix and have several disconnections during the day when on wifi. - Only a few users connected to it. Have moved to Channel 11 to isolate, but issue is still occurring. Any tips on what I should look into to troubleshoot/fix?

Thanks
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Anuj Mandavia

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Posted 3 years ago

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Monnat Systems, AlphaDog

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Hello Anuj,

Below link which is something relevant(not 100%) to your issue to give you some ideas:

https://supportforums.cisco.com/discu...

Coming to your original issue: Why it happens:

Point 1: RF pollution in your WiFi network, May be internal or external from known and unknown source. this issue may trigger the devices to roam frequently for better performing AP.

How do i check this? Start with some basic tools as follows:

Download insidder - http://www.metageek.net/support/downl... this will tell you about all wifi networks in your area and give you channel wise graph to tell which one is less or more congested. will help in channel planning too.

Look at stats here - http://prntscr.com/4iv4vd

point 2: if not because of point 1 then your laptop on which citrix is installed are on the edge of the wireless network hence poor connectivity. See if you can bring real close to the AP and see if they see a change in performce. This is just for testing.

Some suggestions: take a look at the logs which is being printed out in ZD and scrub it with problematic Laptop mac add to see what it has been doing all day so that it gives you pointer about possible root cause and suspect AP.

Keep ZD Upto date on firmware. check with support for best one.

Also make sure that devices on which citrix is running, their WNIC is also upto date on drivers.

---Please post here make n model of WNIC on the laptop/device running citrix.
---ZD Firmware version to suggest upgrade or not
---Since when are you seeing this issue, did you update anything on controller post which you are seeing this? anything got changed somewhere else which you may know?

Hope this helps.
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Anuj Mandavia

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Thanks for your response.
This is a fairly new set up for a client, and I have done some testing with my laptop fairly close to the AP so I don't think connectivity is an issue..
I had detected some RF pollution using InSSIDer, so I changed to Channel 11. no overlaps now.
I had checked on the ZD firmware on my last visit and there were no newer updates available.
I'll look into updating the wnic drivers when I visit the site tomorrow, and also check on the logs.
Will post back with findings.

Thanks again.
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Primož Marinšek, AlphaDog

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You can check how many errors per second you have from the APs system info

1. Go to Monitor :: APs
2. Click the System Info icon of the particular AP
3. Search for "Histogram of PHY errors per second" for "Radio 0"

If you've got a number higher than 0 under 2K, 5K or more there is stuff you need to look into. You can check your L1 with a spectrum analyzer and you L2 with maybe Eye PA or something. But you'll need to capture packets at both ends of the communication to see what's going on.