25.5 Container Networking
By default, containers are connected to a network using a Container Networking Interface (CNI) bridged network stack. In the bridged configuration, all the containers running on a server belong to the same subnet (10.88.0.0/16 by default) and, as such, are able to communicate with each other. The containers are also connected to the external network by bridging the host system’s network connection. Similarly, the host is able to access the containers via a virtual network interface (usually named cni0) which will have been created as part of the container tool installation.
