File transfer issue over wireless Network

[Farooq Muhammad]

I am facing a recently explored issue . The network is recently deployed with 10G LAN Infrastructue such as Access and Core switches . The wireless is composed of Cisco 5520 Controller and the latest Catalyst 9120AXI access points.The ISP internet speed is 100Mbps.
The internet speed is perfectly fine when check with speed test on both LAN and Wireless Lan.However , the users are facing issue when uploading a file to any cloud services such as Google drive etc . The file upload takes for example a 4GB file over the LAN shows 6-7 Minutes , while the Wireless shows 60-80 Minutes.
Iperf tests results are fine when tested with an 802.11ac client and server .

The problem is the same when tested on an AP where 10 users are connected and an AP where no user is connected . Distance from laptop to AP hardly 2m.

Speed and duplex settings on switch ports to AP , UPLINK and Controller interfaces all verified.

We can understand wireless is not comparable to Wired but this seems too much unacceptable.

I can provide any output required.

Any urgent response  is appreciated.

[saravlak]

check, if any uplink throttle configured in wlan or wired side for the wireless client. try from WLAN that doesn't have throttling.

There doesn't appear to be wireless issue based on wireless iperf result.

may need to check the continuous upload speed and report to ISP, if a specific issue identified.

Regarding internet speed:

https://www.speedtest.net/

what's the basic speed test result for UP & DOWN from the test AP.

Download this utility and try the continuous(upload) speed test to get an idea.

http://startrinity.com/InternetQuality/ContinuousBandwidthTester.aspx

check RF connection:

Check client connecting Radio, RSSI/SnR, connection speed and the rate it maintains. 

[Leo Laohoo]

What is the model of wireless NIC? 
What driver is the wireless NIC running on?

[Scott Fella]

First thing I would do is test your local LAN with iPerf. If that is fine like you stated, then wireless is not the issue and is something upstream. 

[Farooq Muhammad]

The Wireless NIC details are attached.

There is no issue with ISP since the file transfers with Wired network has no issue at all.

No throttling configured at any point.

[Leo Laohoo]

Before we begin any troubleshooting, upgrade the driver of the wireless NIC card. 

Download link can be found HERE.

[Farooq Muhammad]

Hi Leo,

Thanks for the response . The driver is now updated to 22.40.0.7 .

Now i am testing on an AP with no other client , distance is 2.5 m for the client test machine.

I have noted one observation , the download speed seems ok as 500Mb file only took 1minute to complete.The upload for the same file is showing 30 Minutes.

Which is not the case with Wired upload.

Hope we can get into some results now.

[Leo Laohoo]

Can you add a different test:  Copy the same file from one computer to another (wireless client to another wireless client).  
Try to avoid going to the WAN link. 

[saravlak]

it appear, its one of the following ie., either at the source of AP or at the edge of your network.

Do you've a special switch port config for wired devices Vs AP switchports for the upstream.

in your network, There could be uplink throttle set on wired/DMZ-infra for all wireless users/VLANs leaving the internet.

check for any filtering/proxy services adding delay.

[Farooq Muhammad]

Sure , i will do now this and attached is the show client output.

[Farooq Muhammad]

The same file via local transfer between the two Machines ( transferred as shared folder) in the same SSID takes much less time . 500Mb file almost 70 Sec . Transfer speed showing 5-7Mbps.

The same case for local transfer has been repeated between different SSIDs with one machine in another SSID and the reponse is identical with end result of 70 sec.

[patoberli]

Do you have special QoS or AVC enabled on the SSID? 

And just to confirm, it's also slow when copying from one Wi-Fi client to one wired client without going through internet?

On the switch connecting to the WLC are you using a port-channel? Is LAG correctly enabled on both sides:

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-wireless/1223-how-to-configure-wlc-lag-and-port-channel-with-nexus-catalyst-switches.html

[Farooq Muhammad]

Yes Patoberli, the LAGs are already configured with dual 10G ports . I did the LAN to WLAN transfer of the same file on the same two machines , the response is similarly acceptable as between local WLAN.

AVC is not enabled on WLC.

There is only a firewall and WAN router involved for internet . Firewall is permitting any any for testing phase and are not giving any different treatment to packets from LAN or WLAN , infact both are permitted via same rule.

[Rich R]

Try "config ap tcp-adjust-mss enable all 1250" - that will only help for TCP traffic, not UDP.
Try using a browser with QUIC (HTTP/3) disabled.for the uploads (to force it to use TCP).

Are you using the latest code - 8.10.151.0?

How you checked all your switch and router ports in the path for input/output drops and/or buffer failures? (feeding 10G infra into 100M can cause microbursts resulting in drops).

Is this flex local switching or central switching over CAPWAP?

Have you done a packet capture on the device, on the AP-WLC connection (if central switching) and at the connection to your internet router (ideally synchronised) which will show fragmentation, packet loss, retransmissions etc?

[Leo Laohoo]

So the transfer from one wireless client to another wireless client takes only 70 seconds?  

This just proven this is no longer a "wireless issue".  

Can you check the router if any QoS is enabled?