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\documentclass{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\draw[red] (-4,4.5) -- +(1,0) node[right,node font=\tiny] {incoming};
\draw[orange] (-4,4.25) -- +(1,0) node[right,node font=\tiny] {rtable 1};
\draw (-4,4) -- +(1,0) node[right,node font=\tiny] {rtable 0};
\node (wg0) at (0,0) {wg0};
\node (vio0) at (0, 2) {vio0};
\node (pf) at (4, 2) {pf};
\node (client) at (-4, 2) {client};
\node (internet) at (0, 5) {internet};
\draw (-1, 2.5) rectangle (5,-0.5);
\node (server) at (2,2.7) {VPN Server};
\draw[->,red] (client) -- (vio0);
\draw[->,red] (vio0) -- (pf);
\draw[->,orange] (pf) -- node[above,sloped] {NAT} (wg0);
\draw[->] (wg0) -- (vio0);
\draw[->] (vio0) -- (internet);
\end{tikzpicture}
\end{document}
%%% Local Variables:
%%% mode: latex
%%% TeX-master: t
%%% End:
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