\documentclass{standalone}

\usepackage[utf8]{inputenc}

\usepackage{pgfplots}
\pgfplotsset{compat=1.3}
\usepgfplotslibrary{units}
\usepgfplotslibrary{dateplot}
\usepackage{tikz}
\usepackage{pgfplotstable}
\usepackage{csquotes}
\usepackage{float}

\begin{document}

\pgfplotstableread{nft/ipt-nft-simple-drop.txt}{\nftsimpledrop}

\begin{tikzpicture}
    \begin{axis}[
    	yshift=-0.5cm,
        xtick={5000,10000,15000,20000,25000,30000},
        xmin=200, xmax=30000,
        ymin=0, ymode=log,
        xlabel={Anzahl der Firewall-Regeln}, ylabel={Pakete pro Sekunde},
        tick label style={/pgf/number format/fixed,/pgf/number format/1000 sep = \thinspace},
        width=15cm, height=10cm,
        legend entries={iptables,nftables},
        scaled ticks=false
    ]
    \addplot[smooth,blue] table [x={rules}, y={iptpps}] {\nftsimpledrop};
    \addplot[smooth,red] table [x={rules}, y={nftpps}] {\nftsimpledrop};
    \end{axis}
\end{tikzpicture}


\end{document}