Difference between revisions of "Rtl8187 wireless"

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m (kernel 2.6.23 was released which includes a rtl8187 driver)
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[[Category:Communication and network (English)]]
+
[[Category:Wireless Networking]]
[[Category:HOWTOs (English)]]
+
 
 
This page describes how to get the '''rtl8187''' wifi-driver working
 
This page describes how to get the '''rtl8187''' wifi-driver working
  
Note: The rtl8187 driver is included in vanilla 2.6.23!
+
Note: The rtl8187 driver is in the kernel (thus the driver comes with the linux package)
  
  
 
The rtl8187 chip is made for usb-cards/dongles
 
The rtl8187 chip is made for usb-cards/dongles
  
It supports 802.11(a)/b/g and the following encryptions:  WEP and WPA -
+
It supports 802.11(a)/b/g and the following encryptions:  WEP, WPA and WPA2
At the time of this writing, I don't know if WPA2 is supported or not.
+
  
 
The driver's source is released under the GPL
 
The driver's source is released under the GPL
  
= Installing the driver =
+
=Using and testing the driver/Troubleshooting=
  
If you are on 2.6.23 you have to enable config RTL8187 in your kernel-config
+
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 you are using anything lower than 2.6.23 you can choose between the following methods
+
== Using the driver ==
  
== Compiling the module from the source-code ==
+
If everything is right, you should have two new interfaces: wlan0 and wmaster0
 +
If you do not see wlan0 just run
 +
ifconfig wlan0 up
  
No HOWTO yet
+
To list all available wifi-networks just run
 +
iwlist wlan0 scan
  
== Patch your 2.6.22 kernel ==
+
For more information about configuring your wifi-network see here: [[Wireless_Setup#Setup_and_Boot|http://wiki.archlinux.org/index.php/Wireless_Setup#Setup_and_Boot]]
  
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
+
= What to do if your connection always times out? =
  
At first you have to get the kernel-sources
+
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.
After that you'll need to download two patches: one for the rtl8187 driver and one for EEPROM_93CX6 (rtl8187 requires EEPROM_93CX6-support)
+
  
Save the following link as EEPROM_93CX6.patch (download it to your harddisk with wget -O EEPROM_93CX6.patch $URL):
+
==Adjusting with iwconfig options==
  
[http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=9467d64b0e88763914c01f71ddf591b166c4f526;hp=7dcca30a32aadb0520417521b0c44f42d09fe05c  EEPROM_93CX6.patch]
+
=== Lowering the rate ===
  
Then save the following link as rtl8187.patch (download it to your harddisk with wget -O rtl8187.patch $URL):
+
The solution can be found in this thread: https://bbs.archlinux.org/viewtopic.php?pid=299642
  
[http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=605bebe23bf6ac66c0a717e663a7baa2f981294d;hp=4b914dc0493edff19ff698a18198a173a14ba9d2 rtl8187.patch]
+
Just set the rate to 5.5
 +
iwconfig wlan0 rate 5.5M auto
  
Now extract your kernel sources, cd into the kernel-source directory
+
Fixed option should ensure, however, it doesn't change the rate on its own, thus making the connection a bit more stable:
and run
+
patch -Np1 -i $path/to/EEPROM_93CX6.patch
+
patch -Np1 -i $path/to/rtl8187.patch
+
  
  make menuconfig
+
  iwconfig wlan0 rate 5.5M fixed
Now activate: <pre> Device Drivers  ---> Misc devices  ---> EEPROM 93CX6 support </pre> (I compiled it directly into the kernel with [*])
+
  
Then go to: <pre> Device Drivers  ---> Network device support  ---> Wireless LAN  ---> Wireless LAN (IEEE 802.11) -> Realtek 8187 USB support </pre>
+
Alternativelly find the $POST_UP option and append the above options to your profile config file:
(I compiled this as module [m])
+
  
What if you can't find "Realtek 8187 USB support" in the kernel config menu?
+
POST_UP="iwconfig wlan0 rate 5.5M fixed"
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>
+
  
 +
Try various rates until you get the optimal setting, with no disconnection. In this case 12Mbits, as shown bellow:
  
Now you can save your kernel-config and start compiling
+
  POST_UP="iwconfig wlan0 rate 12M fixed"
After a reboot the module rtl8187 should be available.
+
You can load it like this:
+
  modprobe rtl8187
+
You can also add rtl8187 to the MODULES-section in your rc.conf
+
  
If you want to add rtl8187 support 'The Arch-Way' make sure to add "patch -Np1 -i ../foo.bar" to your kernel-PKGBUILD
+
Now calling;
  
=Using and testing the driver=
+
netfcg2 -c <wireless profile>
 +
or
 +
  netcfg-menu
 +
and choosing your profile works without extra commands.
  
Make sure that you have loaded the rtl8187 module with
+
=== Lowering the txpower ===
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
+
  
== Using the driver ==
+
You can try lowering the transmit power as well. This may save power as well:
  
If everything is right, you should have two new interfaces: wlan0 and wmaster0
+
  iwconfig wlan0 txpower 5
If you don't see wlan0 just run
+
  ifconfig wlan0 up
+
  
To list all available wifi-networks just run
+
or even as low as 0. Valid settings are from 0 to 20, auto and off for the stock kernel driver.
  iwlist wlan0 scan
+
 
 +
=== 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
 +
 
 +
== Compat-wireless-patched ==
 +
 
 +
The [http://wireless.kernel.org/ Linux Wireless] project provides frequent stable releases of patched drivers for the latest kernels. These drivers fix the "fixed-channel -1" issue, whilst providing better injection.
 +
For further information and installation procedures please read the [[Wireless_Setup#compat-wireless-patched]] article.
 +
 
 +
== Using Ndiswrapper ==
 +
 
 +
If everything else fails, then you are left with using Ndiswrapper. Ndiswrapper takes Windows RTL8187 drivers and uses them to enable your card.
 +
 
 +
'''Install ndiswrapper'''
 +
pacman -S ndiswrapper
 +
 
 +
'''Download the Windows drivers'''
 +
wget [http://db.tt/4NB0HbF6 http://db.tt/4NB0HbF6]
 +
 
 +
'''Extract the drivers'''
 +
unzip ndiswrapper.zip
 +
 
 +
'''Unload the rtl8187 module'''
 +
modprobe -r rtl8187
 +
 
 +
'''Remove any previously installed drivers (if any)'''
 +
 
 +
ndiswrapper -r net8187b
 +
 
 +
'''Install the new drivers'''
 +
 
 +
ndiswrapper -i ./ndiswrapper/net8187b.inf
 +
 
 +
ndiswrapper -m
 +
 
 +
depmod -a
 +
 
 +
'''Make sure that it is installed'''
 +
 
 +
ndiswrapper -l
 +
 
 +
'''Try now loading the module'''
 +
 
 +
modprobe ndiswrapper
 +
 
 +
'''Kernel log shouldn't indicate any errors'''
 +
 
 +
dmesg | tail
 +
 
 +
'''If all steps are successful it should be visible now in the iwconfig interfaces list'''
 +
 
 +
iwconfig
 +
 
 +
'''Add ndiswrapper to the MODULES array in /etc/rc.conf'''
 +
 
 +
MODULES=(... powernow-k7 ndiswrapper ...)
 +
 
 +
'''Blacklist ''rtl8187'' in /etc/modprobe.conf.d/rtl8187.conf'''
 +
 
 +
  blacklist rtl8187
 +
 
 +
Proceed to connect as you normally would.
  
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]
+
{{Note|You may still have issues with disconnections, but in this case setting rates, rts and fragmentation thresholds actually work}}
  
 
=Misc Links=
 
=Misc Links=
*[http://rtl-wifi.sourceforge.net/ Project-page of the rtl-wifi driver project]
+
*[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 01:26, 6 December 2012


This page describes how to get the rtl8187 wifi-driver working

Note: The rtl8187 driver is in the kernel (thus the driver comes with the linux package)


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 driver's source is released under the GPL

Using and testing the driver/Troubleshooting

Make sure that you have loaded the rtl8187 module with

modprobe rtl8187

Then run

dmesg | grep rtl8187
You should see some output like this
 usbcore: registered new interface driver rtl8187 

If you see that line everything should be OK

Using the driver

If everything is right, you should have two new interfaces: wlan0 and wmaster0 If you do not see wlan0 just run

ifconfig wlan0 up

To list all available wifi-networks just run

iwlist wlan0 scan

For more information about configuring your wifi-network see here: http://wiki.archlinux.org/index.php/Wireless_Setup#Setup_and_Boot

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.

Adjusting with iwconfig options

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

Compat-wireless-patched

The Linux Wireless project provides frequent stable releases of patched drivers for the latest kernels. These drivers fix the "fixed-channel -1" issue, whilst providing better injection. For further information and installation procedures please read the Wireless_Setup#compat-wireless-patched article.

Using Ndiswrapper

If everything else fails, then you are left with using Ndiswrapper. Ndiswrapper takes Windows RTL8187 drivers and uses them to enable your card.

Install ndiswrapper

pacman -S ndiswrapper

Download the Windows drivers

wget http://db.tt/4NB0HbF6

Extract the drivers

unzip ndiswrapper.zip

Unload the rtl8187 module

modprobe -r rtl8187

Remove any previously installed drivers (if any)

ndiswrapper -r net8187b

Install the new drivers

ndiswrapper -i ./ndiswrapper/net8187b.inf
ndiswrapper -m
depmod -a

Make sure that it is installed

ndiswrapper -l

Try now loading the module

modprobe ndiswrapper

Kernel log shouldn't indicate any errors

dmesg | tail

If all steps are successful it should be visible now in the iwconfig interfaces list

iwconfig

Add ndiswrapper to the MODULES array in /etc/rc.conf

MODULES=(... powernow-k7 ndiswrapper ...)

Blacklist rtl8187 in /etc/modprobe.conf.d/rtl8187.conf

blacklist rtl8187

Proceed to connect as you normally would.

Note: You may still have issues with disconnections, but in this case setting rates, rts and fragmentation thresholds actually work

Misc Links