if intf == nil {
		return false
	}
	if intf.Flags&net.FlagUp != 0 {
		klog.V(4).Infof("Interface %v is up", intf.Name)
		return true
	}
	return false
}

func isLoopbackOrPointToPoint(intf *net.Interface) bool {
	return intf.Flags&(net.FlagLoopback|net.FlagPointToPoint) != 0
}

// getMatchingGlobalIP returns the first valid global unicast address of the given