Configure a Vbox network for GNS3 with Internet through a cloud with a TAP interface
Today we going to configure a virtual network within GNS3. We can download older GNS3 versiones from sourceforge or the most recent from gns3.com. We need to add the repositories to apt and after install gns3: sudo add-apt-repository ppa:gns3/ppa sudo apt-get update sudo apt-get install gns3-gui To have a connection to access Internet through our physical interface, we create a TAP interface (virtual bridge): sudo apt-get install uml-utilities modprobe tun tunctl ifconfig tap0 10.0.0.1 netmask 255.255.255.0 up On the last line, you configure the ip, that will be the gateway for your virtual topology. Now, as we need forward the packets, between the virtual network and your physical router, you must enable the forwarding option: sudo iptables -I INPUT -j ACCEPT -i tap0 sudo iptables -I OUTPUT -j ACCEPT -o tap0 sudo sysctl -w net.ipv4.ip_forward=1 Now, you need an appliance or a any host image to create our virtual network. You can use a minimal Ubuntu version ...