Difference between revisions of "Rtl8187 wireless"

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[[Category:Communication and network (English)]]
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#REDIRECT [[Wireless Setup]]
[[Category:HOWTOs (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 included in vanilla 2.6.23!
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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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= Installing the driver =
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If you are on 2.6.23 or above you have to enable CONFIG_RTL8187 in your kernel-config.
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You can check if this option is enabled in your current kernel by executing:
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zcat /proc/config.gz | grep CONFIG_RTL8187
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If it outputs
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CONFIG_RTL8187=m
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or
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CONFIG_RTL8187=y
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then your kernel includes the rtl8187 driver
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If you are using anything lower than 2.6.23 you can choose between the following methods:
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== Compiling the module from the source-code ==
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No HOWTO yet
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== Patch your 2.6.22 kernel ==
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Note: if you are already running 2.6.23 or later this is not necessary anymore - just enable the Realtek 8187 USB support in your kernel-config
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At first you have to get the kernel-sources
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After that you'll need to download two patches: one for the rtl8187 driver and one for EEPROM_93CX6 (rtl8187 requires EEPROM_93CX6-support)
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Save the following link as EEPROM_93CX6.patch (download it to your harddisk with wget -O EEPROM_93CX6.patch $URL):
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[http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=9467d64b0e88763914c01f71ddf591b166c4f526;hp=7dcca30a32aadb0520417521b0c44f42d09fe05c  EEPROM_93CX6.patch]
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Then save the following link as rtl8187.patch (download it to your harddisk with wget -O rtl8187.patch $URL):
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[http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=605bebe23bf6ac66c0a717e663a7baa2f981294d;hp=4b914dc0493edff19ff698a18198a173a14ba9d2 rtl8187.patch]
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Now extract your kernel sources, cd into the kernel-source directory
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and run
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patch -Np1 -i $path/to/EEPROM_93CX6.patch
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patch -Np1 -i $path/to/rtl8187.patch
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make menuconfig
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Now activate: <pre> Device Drivers  ---> Misc devices  ---> EEPROM 93CX6 support </pre> (I compiled it directly into the kernel with [*])
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Then go to: <pre> Device Drivers  ---> Network device support  ---> Wireless LAN  ---> Wireless LAN (IEEE 802.11) -> Realtek 8187 USB support </pre>
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(I compiled this as module [m])
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What if you can't find "Realtek 8187 USB support" in the kernel config menu?
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Don't panic - make sure you activated EEPROM 93CX6 support <pre> Device Drivers  ---> Misc devices  ---> EEPROM 93CX6 support </pre> and the Generic IEEE 802.11 Networking Stack (mac80211) <pre> Networking  ---> Wireless  ---> Generic IEEE 802.11 Networking Stack (mac80211) </pre>
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Now you can save your kernel-config and start compiling
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After a reboot the module rtl8187 should be available.
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You can load it like this:
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modprobe rtl8187
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You can also add rtl8187 to the MODULES-section in your rc.conf
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If you want to add rtl8187 support 'The Arch-Way' make sure to add "patch -Np1 -i ../foo.bar" to your kernel-PKGBUILD
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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 don't 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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=== 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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Actually this worked for a while but it would still start revving out, so making the last
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item "fixed" ensures it does not spin.  Btw. If your wireless card has already gone into
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meltdown issuing this command will get it working again.
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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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And then it never times out (at least for me)
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Found the $POST_UP option, so appending this to your profile config
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file, sets the rate correctly when using the netcfg tools.
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    POST_UP="iwconfig wlan0 rate 5.5M fixed"
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Actually for my card setting the rate higher still works, so now this line looks like:
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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: Aircrack-ng patched driver ===
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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 rtl8187-ng package from [[AUR]].
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=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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Symptoms which suggest you may have better luck with Ndiswrapper:
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* "iwlist wlan0 scan" results are irregular and/or don't show some APs.
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* Everything seems to be working, except the DHCP request, which may just time out.
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1. Install ndiswrapper:
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    pacman -Sy ndiswrapper
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2. Download the Windows drivers:
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    wget http://www.kuratkull.com/ndiswrapper/ndisdrivers.tar.gz
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3. Extract the drivers:
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    gzip -dc ndisdrivers.tar.gz | tar xf -
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4. If you have the rtl8187 module loaded, then do this:
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    rmmod rtl8187
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It is suggested that you remove previous ndiswrapper drivers, if you have installed them.
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    ndiswrapper -l
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    ndiswrapper -r <drivername>
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Also add "ndiswrapper" and "!rtl8187" to /etc/rc.conf under MODULES - this will stop rtl8187 from loading on boot, and will enable ndiswrapper to load on boot.
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5. Install the driver:
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If you have an older kernel(eg. older than 2.6.28.*), do:
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    cd ./ndisdrivers/Win98-krnl24/
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If you have a newer kernel (eg. 2.6.28.*), do:
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    cd ./ndisdrivers/Win98seME-krnl28/
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Proceed with:
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    ndiswrapper -i net8187b.inf
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    ndiswrapper -m
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    modprobe ndiswrapper
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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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Revision as of 22:30, 3 August 2013

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