According to the second requirement, all nodes must communicate with all containers. Kubernetes delegates implementation to the container network interface (CNI). Users can choose different implementations, by L2, L3, or overlay. Overlay networking, also known as packet encapsulation, is one of the most common solutions. This wraps a message before leaving the source, delivers it, and unwraps the message at its destination. This leads to a situation in which the overlay increases the network latency and complexity. As long as all the containers can access each other across nodes, you're free to use any technology, such as L2 adjacency or the L3 gateway. For more information about CNI, refer to its spec (https://github.com/containernetworking/cni/blob/master/SPEC.md ...
Pod communication across nodes
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