\documentclass{article}
\begin{document}
  \centerline{
  \begin{tabular}{|l|r|l|l|l|l|l|l|r|}
    \hline
    Octets: 2 & 1 & 0/2 & 0/2/8 & 0/2 & 0/2/8 & 0/5/6/10/14 & variable & 2 \\
    \hline
    Frame & Sequence & Dest. PAN & Dest. & Src. PAN & Src. & Auxiliary & Frame & \\
    Control & Number & Identifier & Adress & Identifier & Address & Security Header & Payload & FCS\\
    \cline{3-6}
    &&\multicolumn{4}{|l|}{Addressing Fields}&&& \\
    \hline
    \multicolumn{7}{|l|}{MHR} & MAC Payload & MFR \\
    \hline
  \end{tabular}}
\end{document}