Intel WiLink 5100 + EAP-350 = slow

EAP900H, EAP600, EAP350, EAP300, EAP9550, etc.

Intel WiLink 5100 + EAP-350 = slow

Postby slp » Wed Oct 24, 2012 10:13 am

I have an EAP-350. It works pretty well, with one exception.

My laptop, which uses an Centrino WiFi Link 5100 a/b/g/n module, won't transmit to the EAP-350 using higher speeds (ie MCS8-15). This laptop works fine with all other APs I've used, so this problem is specific to the EAP-350.

Looking at some sniffs of the traffic, it looks like there's a mistake in the the beacon; the AP isn't advertising support for multiple spatial streams, so I think that's why the client is limiting itself to single-stream operation on the transmit side.

I'm using the latest firmware (v1.2.2) for the EAP-350.

(If the source code for the EAP-350 was published, I'd probably have fixed this already, having a pretty good familarity with the madwifi stack the EAP-350 uses. But I digress.)

Thanks.
slp
 
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Re: Intel WiLink 5100 + EAP-350 = slow

Postby Tofu » Tue Oct 30, 2012 11:42 am

Please send me a packet capture. PM'd you my e-mail.
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Re: Intel WiLink 5100 + EAP-350 = slow

Postby slp » Tue Oct 30, 2012 7:43 pm

An update -- Turns out the 20/40MHz HT mode configuration doesn't quite work correctly; I had to force it to 40MHz to get the Intel 5100 client to ramp up speeds properly; I guess the dynamic width selection was always forcing it to 20MHz operation for some reason.

I'm now seeing 84/106 Mbps Rx/Tx iperf throughput at short range, which is pretty darn good for a 2.4GHz mixed-mode network.

(Oh, I never got a PM, but I suppose it's moot now)
slp
 
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Re: Intel WiLink 5100 + EAP-350 = slow

Postby Tofu » Wed Oct 31, 2012 9:17 am

hmm...strange that you didn't get the PM but thanks for the update
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Re: Intel WiLink 5100 + EAP-350 = slow

Postby mkuhl » Thu Mar 21, 2013 4:20 pm

Hi there,

I found this thread while trying to determine why I get such poor performance here with the following equipment and configuration:

Lenovo R400 laptop with Windows 7 Ultimate
Intel WiFi Link 5300 with Intel driver version 14.3.0.6
EnGenius EAP350 with firmware version 1.2.2

Wireless Mode: 802.11 B/G/N Mixed
Channel HT Mode: 20/40 MHz
Extension Channel: Lower
Channel/Frequency: Ch 11-2.462 GHz
Security Mode: WPA2-PSK
Encryption: AES
Transmit Power: 25 dBm
Distance: 1 km

The laptop only connects at 130 Mbps and a file transfer to a Samba share on a Linux host only achieves appox. 1.5 MB/s. I know the WiFi Link 5300 is capable of faster connections and higher throughput because I get it on other networks with different types of access points, similar to what the original poster described.

I changed some of the settings on the EAP350, as follows:

Wireless Mode: 802.11 N Only
Channel HT Mode: 40 MHz

After save/reboot, the laptop now connects at 300 Mbps and the same file transfer yields approx. 3.5 MB/s. Using an ASUS RT-66U in place of the EAP350 yields no issues with connection (in fact, I can connect in the 5 GHz band as well, which I know the EAP350 does not support), but even connecting on the 2.4 GHz band, I still get transfers that average in the 7-8 MB/s range. I know there are no issues on the server side in regards to the file transfer, as a wired network connection from the same laptop to the same Samba share yields just under 100 MB/s transfer, which is being limited by the gigbit interface in the laptop.

I had decided to switch away from consumer routers and access points, but I am presently very frustrated with my experiences thus far with this access point. I would really appreciate some guidance on how best to configure my EAP350 to achieve better results.

Thanks in advance,

Mike.
mkuhl
 
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Re: Intel WiLink 5100 + EAP-350 = slow

Postby mkuhl » Tue Mar 26, 2013 5:14 pm

I have had to re-enable 802.11 b/g/n/ mixed mode, due to the older devices needing to get access to the network again.

Is there a way for me to contact support, or am I stuck trying to troubleshoot this issue on my own?

No disrespect to EnGenius here, but if I'm unable to get any assistance, are there any suggestions from the other readers here as to similar products in the marketplace in terms of their smoke-detector-like appearance? Maybe something that has support in the 5 GHz band in addition?

Thanks,

Mike.
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