\lstset{%                                                                       
  backgroundcolor=\color{gray!25},                                              
  basicstyle=\ttfamily,                                                         
  breaklines=true,                                                              
  columns=fullflexible                                                          
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\begin{lstlisting}
2017-09-16 10:02:22.807286 IP x.45.177.71.80 > x.x.105.167.39468: Flags [.], ack 1562196897, win 16384, length 0
2017-09-16 10:02:27.514922 IP x.45.177.71.80 > x.x.121.213.62562: Flags [.], ack 14588990, win 16384, length 0
2017-09-16 10:02:28.024516 IP x.45.177.71.80 > x.x.100.72.30395: Flags [.], ack 24579479, win 16384, length 0
2017-09-16 10:02:30.356876 IP x.45.177.71.80 > x.x.65.254.17754: Flags [.], ack 318490736, win 16384, length 0
\end{lstlisting}