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Network Configurations
IPVS
If your cluster's kubeProxy mode is ipvs which is default value in kk, kubernetes will add some ipvs records on each node. You can use ipvsadm command to get more information.
Iptables
If your cluster's kubeProxy mode is iptables, kubernetes will add some iptables records on each node. You can use iptables command to get more information.
Virtual Device
Most of CNI Plugins will create some virtual devices on each node, such as cni0. You can use ip link command to inspect them in details.
As for flannel, virtual devices named with flannel prefix will be created.
As for calico, virtual devices named in cali[a-f0-9]* regexp format will be created.
As for cilium, virtual devices named with cilium_ prefix will be created.
If your cluster's kubeProxy mode is ipvs, additional virtual device kube-ipvs0 will be created.
If your cluster enables nodelocaldns feature for DNS caching purpose, additional virtual device nodelocaldns will be created.
Network Namespace
CNI plugins may create some network namespaces named with cni- prefix depends on which CNI plugin you choose to use. You can use ip netns show 2>/dev/null | grep cni- command to get CNI network namespace list.