Hello everyone.

I get this message "206-unable to create generic ethernet NIO" when I try to connect the router to 'cloud', 'VirtualBox guest' or 'Host', I cannot connect it only to 'NIO UDB' But others devices like ethernet or tap or any other else I get this message, what's the problem with me? or my configuration?

I use Fedora 20 64bit, with GNS3 0.8.7, and VirtualBox.

I got the solution,
That is the permissions, if Fedora you have to be root to use GNS3 perfectly, otherwise you'll face some construction boundaries.
You can run gns3 in Fedora from the terminal



Or add the following to this file in your home directory


Add this line:


Or you can run it from KDE GUI, press Alt + F2, then type 'kdesu gns3'

And run 'vritualbox' as a root from the terminal, if you face some issue, run it as the following: