Difference between revisions of "Rtl8187 wireless"

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{{i18n|Rtl8187 wireless}}
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#REDIRECT [[Wireless Setup]]
[[Category:Wireless Networking (English)]]
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This page describes how to get the '''rtl8187''' wifi-driver working
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Note: The rtl8187 driver is in the kernel (thus the driver comes with the kernel26 package)
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The rtl8187 chip is made for usb-cards/dongles
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It supports 802.11(a)/b/g and the following encryptions:  WEP, WPA and WPA2
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The driver's source is released under the GPL
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=Using and testing the driver/Troubleshooting=
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Make sure that you have loaded the rtl8187 module with
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modprobe rtl8187
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Then run
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dmesg | grep rtl8187
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You should see some output like this <pre> usbcore: registered new interface driver rtl8187 </pre>
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If you see that line everything should be OK
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== Using the driver ==
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If everything is right, you should have two new interfaces: wlan0 and wmaster0
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If you do not see wlan0 just run
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ifconfig wlan0 up
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To list all available wifi-networks just run
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iwlist wlan0 scan
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For more information about configuring your wifi-network see here: [http://wiki.archlinux.org/index.php/Wireless_Setup#Setup_and_Boot http://wiki.archlinux.org/index.php/Wireless_Setup#Setup_and_Boot]
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== What to do if your connection always times out? ==
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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.
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=== Method 1: Lowering the transfer rate manually ===
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The solution can be found in this thread: http://bbs.archlinux.org/viewtopic.php?pid=299642
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Just set the rate to 5.5
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iwconfig wlan0 rate 5.5M auto
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Fixed option should ensure, however, it doesn't change the rate on its own making the connection a bit more stable:
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iwconfig wlan0 rate 5.5M fixed
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I have also tried setting this in the IWOPTS, but it does not seem to be taking, so now what I do until I get this sorted out is:
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  netcfg2 -c <your wireless profile>
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  iwconfig wlan0 rate 5.5M fixed
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Alternativelly find the $POST_UP option and append the above options to your profile config file:
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    POST_UP="iwconfig wlan0 rate 5.5M fixed"
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Try various rates until you get the optimal setting, with no disconnection. In this case 12Mbits, as shown bellow:
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    POST_UP="iwconfig wlan0 rate 12M fixed"
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Now calling;
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    netfcg2 -c <wireless profile>
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or
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  netcfg-menu
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and choosing your profile works without extra commands.
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=== Method 2: Lowering the txpower ===
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You can try lowering the transmit power as well. This may save power as well:
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iwconfig wlan0 txpower 5
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or even as low as 0. Valid settings are from 0 to 20, auto and off for the stock kernel driver.
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=== Method 3: Aircrack-ng patched driver ===
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{{Note|Note that this driver only works on kernel26}}
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Another method that works for some users are the Aircrack-ng patches for the rtl8187 driver. This driver can be installed by the [http://aur.archlinux.org/packages.php?ID=15375 rtl8187-ng] package from [[AUR]].
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Since the above package is outdated as of 11/08/11 you can try installing the [https://aur.archlinux.org/packages.php?ID=51272 linux-aircrack] patched kernel instead from [[AUR]] or the precompiled package from the [https://wiki.archlinux.org/index.php/Unofficial_User_Repositories adslgr32] unofficial repository
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=== Method 4: Using Ndiswrapper ===
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If everything else fails, then you are left with using Ndiswrapper. Ndiswrapper takes Windows RTL8187 drivers and uses them to enable your card.
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1. Install ndiswrapper:
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pacman -S ndiswrapper
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2. Download the Windows drivers:
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wget [http://db.tt/4NB0HbF6 http://db.tt/4NB0HbF6]
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3. Extract the drivers:
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unzip ndiswrapper.zip
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4. If you have the rtl8187 module loaded, then do this:
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modprobe -r rtl8187
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5. Install the driver:
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If you have any previous drivers installed that may or may not have failed remove them:
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ndiswrapper -r net8187b
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Install the new drivers:
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ndiswrapper -i ./ndiswrapper/net8187b.inf
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ndiswrapper -m
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Make sure that it is installed:
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ndiswrapper -l
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Try now loading the module
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modprobe ndiswrapper
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Kernel log shouldn't indicate any errors:
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dmesg | tail
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If all steps are successful it should be now visible in the iwconfig interfaces list:
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iwconfig
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6. Add ndiswrapper to the MODULES array in /etc/rc.conf
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MODULES=(... powernow-k7 ndiswrapper ...)
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7. Blacklist '''rtl8187''' in /etc/modprobe.conf.d/rtl8187.conf
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blacklist rtl8187
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Proceed to connect as you normally would.
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=Misc Links=
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*[http://rtl-wifi.sourceforge.net/ Project-page of the rtl-wifi driver project]
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*[http://aircrack-ng.org/doku.php?id=r8187 Aircrack-ng information and tweaks for rtl8187 chips]
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Revision as of 22:30, 3 August 2013

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