Difference between revisions of "Rtl8187 wireless"

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(use ip route2 commands.)
(contained only general information, the driver itself "should just work" or the general informations are enough)
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[[Category:Wireless Networking]]
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#REDIRECT [[Wireless Setup]]
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, however, 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 bellow:
 
 
 
POST_UP="iwconfig wlan0 rate 12M fixed"
 
 
 
Now calling;
 
 
 
netfcg2 -c <wireless profile>
 
or
 
  netcfg-menu
 
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]
 

Revision as of 22:30, 3 August 2013

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