# Functions
CalcNodeCidrSize determines the size of the subnets used on each node, based on the pod subnet provided.
DetectHostIPv4 attempts to determine the host IPv4 address by finding the first non-loopback device with an assigned IPv4 address.
GetDNSIP returns a dnsIP, which is 10th IP in svcSubnet CIDR range
Copied from github.com/kubernetes/kubernetes/cmd/kubeadm/app/constants/constants.go.
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