Picture 1 - Bridging Ethernet and Virtual TAP InterfaceĦ/ Assign IP address to virbr0 interface and remove IP address eth0 interface Note: Check if tap0 and eth0 are properly bridged. Tap interface is persistent and owned by user brezularĥ/ Add eth0 and tap0 to the bridge and bring the interfaces up After that a module should be presented in the output of lsmod command. If you get an error message no such file or directory, load a module to a Linux kernel with the modprobe tun command. To check the availability of this module do the following: The tunctl utility is used to create and manage virtual TUN/TAP interfaces. It is required that a generic TUN/TAP driver is either built-in to kernel, or available as a module. The bridge utility creates a virtual bridge interface that forwards traffic between tap and Ethernet interface. The Fedora Linux package bridge-utils can be used for this job. To create a bridged connection between the guest and host we have to create a virtual tap interface on the host and Qemu must be told to bridge a guest interface with a tap interface. Then we can create a bridge virtual interface and bridge an existing host Ethernet interface and tap interface together. This type of connection between is called a bridged connection and the both - guest and host IP addresses are assigned from the same subnet. Our goal is to create configuration which allows traffic being initialized from the both directions.
An IP address of the guest network interface is assigned automatically from an internal Qemu DHCP server and it is typically 10.0.2.15/24 with a default gateway IP address 10.0.2.2. Traffic coming from the host to the guest that is not established, is discarded. The NAT ensures that traffic leaving guest OS is passed out of the guest network interface without any restrictions but only established traffic is allowed to enter a guest network interface.
The interface connects a guest OS with with a host OS using a NAT mode. A virtual machine is created and virtualized by Qemu emulator, installed on the host.īy default, when a Qemu virtual machine is started without specifying NIC options, one single network interface is created on the guest OS. In this tutorial I would like to show how to bridge an Operation System (OS) that is running inside a virtual machine (guest), with OS running on physical hardware (a host).
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