DevBrainOps
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The following image depicts the conceptual networking components involved when running a VM on a computer then launching a LXC container on that VM.
Be aware that many details have been omitted and would be required to make this a functioning example.

The real machine is connected to an ISP providing DHCP services assigning our adapter an address of 192.168.0.187.

The real machine is using KVM and deployed libvirtd which provides dhcp services in the subnet of 192.168.122.0 on the devices connected to Virt-bridge-1.

Our Virtual Machine is connected to Virt-Bridge-1 via the virtual adapter Virt-NIC-1 and is assigned an IP Address of 192.168.122.223.

Additionally, the Virtual-Machine has a dhcp server provided by its instance of libvirt. The default address of 192.168.122.1 for the dhcp server on Virtual-Machine has to be altered to avoid conflicts with the dhcp server running on the real machine. In this example the dhcp server on the Virtual-Machine was moved to the subnet 192.168.124.0.
A second virtual bridge, Virt-Bridge-2 and virtual adapter Virt-NIC-2 were created on Virtual-Machine by libvirtd.

The lxc-container default configuration looks for the bridge by name. The libvirtd generated bridge is usually called virbr0. In this example the lxc default bridge was changed from lxbr0 to virbr0.

The LXC-container will receive an IP Address from the dhcp server on the Virtual-Machine. In this example the address is: 192.168.142.223.
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