Slow wifi speed on AIR-CAP1602I-E-K9 WLC 2504 8.2

[dmartinezrubio@gmail.com]

Hello, recently I upgrade wlc2504 to 8.2.166.0 and the AP's (30 uds) to the model AIR-CAP1602I-E-K9.

My wireless network have 2xSSID (both WP2 PERSONAL+TKIP, the same config in both except ssid'name and password obviously).

Each SSID connect with a ISP with 300 Mb (upload/download).

I did a test with my laptop directly in both router and get 300Mbs in both ways.

I connected my laptop in the switch and get same speed.

When I connect via wifi in both ssid the download speed connection is half than the upload speed.

Also, in one of the 2 ssid the speed is lower than connecting to the other ssid.

I applied best practices without improvement.

The test was with a laptop Windows 7 and one Macbook Pro

Any idea where can be the issue?

[Leo Laohoo]

What is the exact make and model of the wireless NIC card?

Half the upload speed would make the wireless NIC to be 2X2:2.  

[dmartinezrubio@gmail.com]

Windows NIC: Broadcom BCM943228HMB 802.11 abgn 2x2 

MacBookPro: AirPort Extreme BroadCom BCM43xx 1.0

The speed test was:

Download: 10 Mbps

Upload: 80 Mbps

*Attach ssid configuration*

[Scott Fella]

Before doing any Speedtest, download iPerf3 and run that locally. One machine should be wired and the server and the wireless device a client. If you are seeing good speeds then it’s not an issue with wireless.

[dmartinezrubio@gmail.com]

I did it with the mac and the speed was the same

[Scott Fella]

Using iPerf?

[dmartinezrubio@gmail.com]

Using iperf over wifi against a server on the LAN was perfect, it is only when trying to navigate by Internet

[Scott Fella]

So you know that traffic from a client to another machine that is wired goes from AP to controller to router/L3 (if wired is on a different subnet) and then to the server. I would look at the something else maybe a policy on the router for the subnet?

[dmartinezrubio@gmail.com]

All is in the same vlan.

The topology is:

FTTH ISP -> FW -> SW CISCO LEVEL2 RSTP-WLC CISCO

The vlan is the default vlan (management)....I reckon that it's not important, isn't it?

[Leo Laohoo · Accepted solution]

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dmartinezrubio@gmail.com wrote:

Windows NIC: Broadcom BCM943228HMB 802.11 abgn 2x2 

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Just as suspected:  The wireless NIC can only support 2x2:2.  

[dmartinezrubio@gmail.com]

Any idea about the big difference between upload and download speed?

[Scott Fella]

Just keep in mind that for 802.11n or 802.11ac (5Ghz) the SSID needs to be open or use WPA2-AES.

[dmartinezrubio@gmail.com]

Sorry, WPA2 AES with PSK (and FT PSK)

[Scott Fella]

So overall throughput will be determined if your on 2.4Ghz or 5Ghz and if channel width on the 5Ghz is set to 40MHz. Since wireless is half duplex, don’t expect wired speed. Look at what data rate your device negotiated at and then divide that number in half. That would be the max theoretical throughput you would see.