Flannel is a basic overlay network that works by assigning a range of subnet addresses (usually IPv4 with a /24 or /16 subnet mask). … While flannel was originally designed for Kubernetes, it is a generic overlay network that can be used as a simple alternative to existing software defined networking solutions.

What is flannel interface?

VXLAN Device – flannel. The main function of this interface (flannel. 1, in our diagram) is to guarantee one of the premises of communication between Pods and their networks (remember each node has a subnet and each Pod has an IP of this subnet), through an overlay of layer2.

What is flannel plugin?

Flannel is an open-source virtual network project managed by CoreOS network designed for Kubernetes. Each host in a flannel cluster runs an agent called flanneld . It assigns each host a subnet, which acts as the IP address pool for containers running on the host.