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tun tap can be implemented on Mac OS X using http://tuntaposx.sourceforge.net It behaves in the same way as FreeBSD/OpenBSD implementations, but Qemu needs a patch to use the OpenBS/FreeBSD code. As per the patch listed in this forum thread: http://forum.gns3.net/post17679.html#p17679 And also as used in the MacPorts installation: https://trac.macports.org/browser/trunk/dports/emulators/qemu/files/patch-net-tap-interface.diff Signed-off-by: Alasdair McLeay <alasdair.mcleay@me.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>