arpspoof
Tool ARPSpoof which is part of the DSniff Package.To get this Tool running on Mac OS X your best bet is to use Mac Ports, so go ahead and download the right Version for your Operating System: Download Page. After that you should be able to use the
port
The MacPorts “selfupdate” command will also be run for you by the installer to ensure you have our latest available release and the latest revisions to the “Portfiles” that contain the instructions employed in the building and installation of ports. After installation is done, it is recommended that you run this step manually on a regular basis to to keep your MacPorts system always current:
sudo port selfupdate
followed by
sudo port install dsniff-devel
or
sudo port install dsniff
sudo port -v selfupdate