Wifi stops working after a while

[mma]

Wifi stops working after a while and I have to reconnect. Can you help?

description: Wireless interface
product: AR9285 Wireless Network Adapter (PCI-Express)
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:03:00.0
logical name: wlan0
version: 01
serial: 74:2f:68:38:58:f6
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=ath9k driverversion=3.13.0-24-generic firmware=N/A ip=192.168.0.143 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
resources: irq:17 memory:de200000-de20ffff

[Pjotr]

That particular wireless chipset usually performs flawlessly out of the box.... Strange.

What does this command give:

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iwconfig

[mma]

Command iwconfig gives:

eth0 no wireless extensions.

lo no wireless extensions.

wlan0 IEEE 802.11bgn ESSID:"Elisa_uFi_648496"
Mode:Managed Frequency:2.472 GHz Access Point: 78:E8:B6:64:84:96
Bit Rate=65 Mb/s Tx-Power=16 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=51/70 Signal level=-59 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:63 Missed beacon:0

[Pjotr]

Do you have Bluetooth as well, in your computer?

[mma]

Yes, I have also bluetooth in my computer. But I don't use it and I don't know is it working in Linux.

[JeremyB]

Lets see

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iwconfig | grep -A5 'Bit Rate'

and look at

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iwlist scan

for your wifi SSID and see what the encryption is, it will look like

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IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : PSK

You want to see CCMP only, no TKIP and no WEP

[mma]

It seems that wifi stays connected but bit rate drops. And after a while bit rate is better again.

wlan0 IEEE 802.11bgn ESSID:"Elisa_uFi_648496"
Mode:Managed Frequency:2.472 GHz Access Point: 78:E8:B6:64:84:96
Bit Rate=1 Mb/s Tx-Power=16 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=37/70 Signal level=-73 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:1 Invalid misc:188 Missed beacon:0

[Biker]

How far away from the router are you? If you move closer for a better signal strength, do you still experience the connection issue?

[mma]

Distance to the router is only few metres. I have Windows 7 also in same computer and in Windows wifi works fine. So problem is in linux.

[DariusThe1st]

The same here. Bluetooth adapter is definitely not a problem. I use one, so I've tested. The problem persist even when the bluetooth adapter isn't plugged.

[JeremyB]

It might be an issue with the math behind the receive attenuation in Linux and it might be worth trying a newer kernel that you can find in the Mint Update Manager by clicking on View and then Linux Kernels

[DariusThe1st]

I've upgraded to the newest 3.19 kernel, but still, the problem remains the same.

[JeremyB]

I've upgraded to the newest 3.19 kernel, but still, the problem remains the same.

Look at the results from

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iwlist scan

and look for your access point name and see if it is using TKIP as it will cause problems

[DariusThe1st]

There are few lines which are mentioning TKIP, some of them for the router and other for the repeater, if I understood correctly. These ones are an example from the "iwlist scan" command results:

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Group Cipher : TKIP
Pairwise Ciphers (1) : TKIP

[JeremyB]

There are few lines which are mentioning TKIP, some of them for the router and other for the repeater, if I understood correctly. These ones are an example from the "iwlist scan" command results:

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Group Cipher : TKIP
Pairwise Ciphers (1) : TKIP

You should be able to set the router and the repeater to WPA2 only and the iwlist scan result should change to CCMP instead of TKIP and your issues should stop