*Since version v.2.11.0
If you want to control traffic flow at the IP address or port level, then you might consider using NetworkPolicies. NetworkPolicies are an application-centric Kubernetes objects which allow you to specify how a pod is allowed to communicate with various network "entities" over the network. For more details you can check Kubernetes official documentation
For the moment, Kubernetic can display, edit and delete the network policies from a Kubernetes cluster. Creation feature is still unavailable.