GNS3 Notes

Starting a virtual machine produces this error:

VirtualBox can't operate in VMX root mode. Please disable the KVM kernel extension, recompile your kernel and reboot (VERR_VMX_IN_VMX_ROOT_MODE).

Disable the libvirt kernel module with either of:

sudo modprobe -r kvm-intel
# Or
sudo modprobe -r kvm-amd

Compiling QEMU 1.6.0 from source

tar xvjf qemu-1.6.0.tar.bz2
cd qemu-1.6.0
sudo apt-get install zlib1g-dev
sudo apt-get install libglib2.0*
sudo apt-get install autoconf
sudo apt-get install libtool
sudo apt-get install libsdl-console
sudo apt-get install libsdl-console-dev
./configure
make
sudo make install

Default configs:

line con 0
exec-timeout 0 0
session-timeout 0
logging synchronous

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