12-03-2014 03:18 PM - edited 07-05-2021 02:04 AM
My network is a simple network: 1 Gateway, 1 switch, 1 WLC2504 and 1 AP-3602I
If I wired my laptop to the switch and do speedtest.net, I get 100Mbs down, 100Mbs Up, which is the speed provided by our ISP
If I connect the laptop wirelessly to the AP, and do a Speedtest.net, I get 30-40Mbs down, 100Mbs Up
If I use IPerf to test the connection from the Wireless laptop to a Wired Server, on the same local net, I get 140Mbs Up/Down
At all time, my laptop is connected at 450Mbs, A channel. Only 1 device on the AP, which is my laptop.
You might will ask, but I verified:
- No QoS setup anywhere in the network. WLAN QOS tab is clean.
- I even removed the switch and connected the WLC directly to the gateway. Same results.
Interesting right ? I know.
Please advise.
09-09-2015 10:24 PM
I was having the same issue, wired had 90Mbps down/6Mbps up and wireless was like 18-21Mbps down/5.5Mbps up.
I checked my adapter settings and found that mixed channel mode was enabled by default. I changed this to the 5.2 MHz channel and now it's running at full speed.
Something to try.
05-01-2016 09:17 AM
So any one find the solution yet? I have the same issue.
12-12-2017 05:57 AM
Glad I'm not the only one. Same issue here. Larger deployment.
5520 on 8.2.161.0 with 30+ sites in Flex Local Switching all using 3802i's. All sites have a local egress internet ranging from 50Mg to 1gig. One site in particular is having this same issue. It has a 250MG circuit. On the wire we get 200-230 Down/up consistently. On wireless at this site we get 90-100 down and 200-230Up. Doesn't matter what cilent. Examples:
Mackbook Pro: 802.11ac Connected in the -50s and 40s SNR s3 m9 600MG on 40Mhz. Download 90-100 and upload 200-230 (Expected upload, degraded download).
Lenovos with WIn 10: 802.11 ac Connected in the -50s and 40s SNR s2 m9 400MG on 40Mhz. Download 90-100 and upload 200-230.
Any device on the wire gets the right speeds.
Drive up the road to another site. Same model AP's, same design/arch, same WLAN's. Same 250Mg internet. 200-230 down and 200-230 up on wireless.
The Arch is:
3802i -> 2960XR -> PaloVM -> 250MG Internet
I have 4 WLAN's at this site. 2 are corperate and route locally off the 2960XR and 2 are "guest" type and are layer 2 right into an interface on the Palo. All have the same issue. I have tried standing up a new FW that was a PFSense and created a whole new layer 2 vlan and WLAN to drop directly to it. Same issue with that setup.
I have a TAC case open and have linked to this support forum within its notes. I'll update my findings as I hopefully resolve this.
01-10-2018 10:58 AM
Did you find the cause of your problem? I have a similar issue with slow download speeds. I have 5520WLC - 6509 - 3750G - 2702i. I get 70 up and 6 down. Using iperf test software.
01-18-2018 06:48 PM
I found the QOS configuration on the 3750 was part of the problem. After disabling this feature (no MLS QOS) I started getting 17Mbs downloads. Still much slower than expected but better. I also noticed that my Guest SSID (open authentication) is now getting ~60Mbs up and down but my enterprise SSID is only getting 17Mbs downloads. I am using WPA/WPA2 AES with 802.1x.
WLC = 5520 running 8.2.160.0
AP= 2702i
01-18-2018 06:51 PM
Working with tac what fixed a bit of my issue was the adjustment of TCP MSS to 1250. Made a huge difference at a number of sites. However, I'm still perplexed at one site that gets consistent 100 down 200 up. Its clearly not "bad" but on the wire its 200/200.
01-18-2018 07:02 PM
01-18-2018 07:04 PM
If it wasn't just this one site that is so odd I wouldn't worry about it. Just one site that is 100down 200 up. Most other sites I get closer to the same.
01-18-2018 07:07 PM
01-19-2018 05:07 AM
Yup that is the weird thing. Iperf tests locally look fine. Symmetrical. Its only this site on wireless that we see the big degradation in download speed over upload speed. We will have a second internet connection at some point and I'm going to try flipping to it and testing.
01-19-2018 12:36 PM - edited 01-19-2018 12:37 PM
We are running into the same issue.Slow Internet download, good upload. Good down an upload on local servers.
It's very certain a problem of fragmentation.
We had put a server outside firewall and can reproduce the issue, same here: slow download, good upload.
When reducing the MSS on the outside server download is much better. So definitely a problem of fragmentation.
At the moment I'm not sure whether the firewall or the WLC cause the performance issue when it has to deal with fragmentation.
Environment: WLC 8540, Version 8.6, AP2802
01-19-2018 03:00 PM
It looks like our controller is marking the capwap as voice. This is causing the network to drop a good portion of them. I'm going to test with QOS on the controller set to silver or possibly off next week.
01-19-2018 03:05 PM
Interesting. I tried playing around with both the QOS and AVC at the site I had issues at and it didn't seem to make a difference. Still just so weird that its just this site....just the internet on wireless.
01-19-2018 03:50 PM
We have seen that also and locally everything is fine. It’s the egress to the provider and a misconfiguation on their end has been an issue.
01-19-2018 04:19 PM
You can verify it: Just plug off your provider router and put in an own server. Probably, you will recognise the same issue.
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