%
% internet.tex -- Modellinternet
%
% (c) 2021 Prof Dr Andreas Müller, OST Ostschweizer Fachhochschule
%
\documentclass[tikz]{standalone}
\usepackage{amsmath}
\usepackage{times}
\usepackage{txfonts}
\usepackage{pgfplots}
\usepackage{csvsimple}
\usetikzlibrary{arrows,intersections,math}
\begin{document}
\def\skala{1}
\begin{tikzpicture}[>=latex,thick,scale=\skala]

\foreach \x in {0,3,6,9}{
	\foreach \y in {0,3}{
		\fill[color=white] ({\x},{\y}) circle[radius=0.3];
		\draw ({\x},{\y}) circle[radius=0.3];
	}
}
\node at (0,3) {$1$};
\node at (0,0) {$2$};
\node at (3,3) {$3$};
\node at (3,0) {$4$};
\node at (6,3) {$5$};
\node at (6,0) {$6$};
\node at (9,3) {$7$};
\node at (9,0) {$8$};
% 1
\draw[->,shorten >= 0.3cm, shorten <= 0.3cm] (0,3) -- (3,3);
\draw[->,shorten >= 0.3cm, shorten <= 0.3cm] (0,3) -- (0,0);
% 2
\draw[->,shorten >= 0.3cm, shorten <= 0.3cm] (0,0) to[out=-20,in=-160] (3,0);
% 3
\draw[->,shorten >= 0.3cm, shorten <= 0.3cm] (3,3) -- (6,3);
\draw[->,shorten >= 0.3cm, shorten <= 0.3cm] (3,3) -- (0,0);
% 4
\draw[->,shorten >= 0.3cm, shorten <= 0.3cm] (3,0) -- (6,3);
\draw[->,shorten >= 0.3cm, shorten <= 0.3cm] (3,0) -- (6,0);
\draw[->,shorten >= 0.3cm, shorten <= 0.3cm] (3,0) to[out=160,in=20] (0,0);
% 5
\draw[->,shorten >= 0.3cm, shorten <= 0.3cm] (6,3) -- (9,3);
\draw[->,shorten >= 0.3cm, shorten <= 0.3cm] (6,3) -- (9,0);
\draw[->,shorten >= 0.3cm, shorten <= 0.3cm] (6,3) -- (6,0);
% 6
\draw[->,shorten >= 0.3cm, shorten <= 0.3cm] (6,0) to[out=20,in=160] (9,0);
% 7
\draw[->,shorten >= 0.3cm, shorten <= 0.3cm] (9,3) .. controls (7.5,4) .. (6,4) -- (3,4) .. controls (1.5,4) .. (0,3);
\draw[->,shorten >= 0.3cm, shorten <= 0.3cm] (9,3) to[out=-110,in=110] (9,0);
% 8
\draw[->,shorten >= 0.3cm, shorten <= 0.3cm] (9,0) to[out=-160,in=-20] (6,0);
\draw[->,shorten >= 0.3cm, shorten <= 0.3cm] (9,0) to[out=70,in=-70] (9,3);

\end{tikzpicture}
\end{document}