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The rtl8187 driver is a FOSS mac80211 driver for RTL8187L and RTL8187B. Rtl8187 is part of the official Linux kernel. Starting with 2.6.27, this driver is supported by aircrack-ng.
To use the driver with aircrack-ng, it's recommended that you apply the following patch:
If you have r8187/r8187b installed, don't forget to blacklist it before using this driver.
Just a reminder that if you are using the Compat-Wireless version, then no patching is required since all the patch changes are already included. This forum posting provides an excellent description of how to install the compat-wireless software.