Difference between revisions of "Rtl8187 wireless"

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[[Category:Wireless Networking]]
#REDIRECT [[Wireless network configuration]]
This page describes how to get the '''rtl8187''' wifi-driver working
The rtl8187 chip is made for usb-cards/dongles. It supports 802.11(a)/b/g and the following encryptions:  WEP, WPA and WPA2. The rtl8187 driver is in the kernel now.
== Using the driver ==
Make sure that you have loaded the rtl8187 module with
# modprobe rtl8187
Then run
# dmesg | grep rtl8187
You should see some output like this <pre> usbcore: registered new interface driver rtl8187 </pre>
If you see that line everything should be OK
If everything is right, you should have two new interfaces: wlan0 and wmaster0
If you do not see wlan0 just run
# ip link set dev wlan0 up
To list all available wifi-networks just run
# iw dev wlan0 scan
For more information about configuring your wifi-network see here: [[Wireless_Setup#Part II: Wireless management|Wireless management]].
== What to do if your connection always times out? ==
The open source driver suffers from a lot of tx excessive retries and invalid misc errors for some unknown reason, resulting in a lot of packet loss and it keeps disconnecting, some times instantly.
=== Lowering the rate ===
The solution can be found in this thread: https://bbs.archlinux.org/viewtopic.php?pid=299642
Just set the rate to 5.5
iwconfig wlan0 rate 5.5M auto
Fixed option should ensure that it doesn't change the rate on its own, thus making the connection a bit more stable:
iwconfig wlan0 rate 5.5M fixed
Alternativelly find the $POST_UP option and append the above options to your profile config file:
POST_UP="iwconfig wlan0 rate 5.5M fixed"
Try various rates until you get the optimal setting, with no disconnection. In this case 12Mbits, as shown below:
POST_UP="iwconfig wlan0 rate 12M fixed"
Now calling;
netfcg2 -c <wireless profile>
and choosing your profile works without extra commands.
=== Lowering the txpower ===
You can try lowering the transmit power as well. This may save power as well:
iwconfig wlan0 txpower 5
or even as low as 0. Valid settings are from 0 to 20, auto and off for the stock kernel driver.
=== Setting rts and fragmentation thresholds ===
Default iwconfig options have rts and fragmentation thresholds off. These options are particularly useful when there are many adjacent APs or in a noisy environment.
The minimum value for fragmentation value is 256 and maximum is 2346. In many windows drivers the maximum is the default value:
iwconfig wlan0 frag 2346
For rts minimum is 0, maximum is 2347. Once again windows drivers use maximum as the default:
iwconfig wlan0 rts 2347
== See also ==
*[http://wireless.kernel.org/ The Linux Wireless project]
*[http://aircrack-ng.org/doku.php?id=r8187 Aircrack-ng information for rtl8187 chips]

Latest revision as of 11:33, 13 February 2014