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Since upgrading to OSX 10.9 Mavericks VirtualBox machines that have a Bridged Network have been unable to start.

Installing VirtualBox again solves the problem temporarily, but this does not survive a reboot (or in my case kicking the power supply cable out!).

Has anyone come up with a permanent solution for this, or at least one that does not involve a fresh install?

2

I've found a temporary solution. It appears that on reboot not all the kernel extensions are loaded correctly. However a restart of the VirtualBox startup item seems to resolve this and I can then start the machines.

sudo  /Library/StartupItems/VirtualBox/VirtualBox restart

Is the line that works for me, sometimes I have to run it twice.

0

Unless I am mistaken regarding the issue here, simply enabling IP forwarding on the OS X host will resolve the issue:

sudo sysctl -w net.inet.ip.forwarding=1

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