MDK3 is a tool, that "injects" data into wireless networks. "Injection" is the possibility to send self-made data through the air without being connected or associated to anything. MDK3 is used to send valid and invalid data, that does belong to the wireless management and not to a regular data connection. This is only possible with this Injection technique. Sadly, this is something, wifi equipment is NOT build for! To enable the injection feature on your wireless card, you need modified drivers. A lot of work has already been done by several hackers (including me) to make these modified drivers available for a lot of wifi adaptors.
Added to Portage. Thanks to all who contributed. 22 Feb 2011; Dane Smith <c1pher@gentoo.org> +files/3.6-makefile.patch, +mdk-3.6.ebuild, +metadata.xml: Initial commit for mdk. Moved from the Sunrise overlay wrt bug 265280 and bug 178561. Thanks to Justin Lecher (jlec@gentoo.org) for the ebuild. Closing. *** This bug has been marked as a duplicate of bug 178561 ***