There are plenty of options when it comes to implementing networking in Kubernetes. Kubernetes itself doesn't care about how you implement it, but you must meet its three fundamental requirements:

• All containers should be accessible to each other without NAT, regardless of which nodes they are on
• All nodes should communicate with all containers
• The IP container should see itself in the same way as others see it

Before getting any further into this, we'll first examine how default container networking works.