This thesis describes the design of a perimeter security solution of an organisation. In the first part of this thesis I am describing some theoretical basics and since chapter six I start describing the main topic of this thesis. In the first logical part of the main topic part I am describing a present situation of an organisation and starting the planning of the solution. In the second logical part of the main topic part I am describing the router Turris Omnia. In that part I am describing this device from different angles. Then next logical part describes the final solution of a perimeter security solution of an organisation. And finally after that there is the part of the evaluation and benefits of this thesis and the conclusion of this thesis.