Packet structures fotr IPv4 / TCP/ UDP and ICMP for use in LaTeX documents. These depend on the bytefield package

gistfile1.txt

%% These require the use of the bytefield package
Snippets are suitabel for inclusion in tha figure environment

%%IPv4 after Postel 1981 & Stevens 1993
\centering
\begin{bytefield}{32}
\bitheader{0,3,4,7,8,15,16,23,24,31} \\
\bitbox{4}{\tiny{Version}} & \bitbox{4}{\tiny{Header length}} & \bitbox{8}{TOS}  & \bitbox{16}{Total Length} \\
\bitbox{16}{Identification}  &\bitbox{1}{\tiny 0} &\bitbox{1}{\tiny D\\F}
&\bitbox{1}{\tiny M\\F} & \bitbox{13}{Fragment Offset}  \\
\bitbox{8}{TTL} & \bitbox{8}{Protocol} & \bitbox{16}{Header Checksum}  \\
\bitbox{32}{Source Address} \\
\bitbox{32}{Destination Address} \\
\bitbox{32}{Options}  \\
\wordbox[lrt]{1}{Payload} \\ 
\skippedwords \\ 
\wordbox[lrb]{1}{} \\
\end{bytefield}

%%% TCP
\centering
\begin{bytefield}{32}
\bitheader{0,7,8,15,16,23,24,31} \\
\bitbox{16}{Source Port} & \bitbox{16}{Destination Port} \\
\bitbox{32}{Sequence Number} \\
\bitbox{32}{Acknowledgment Number} \\
\bitbox{4}{Offset} & \bitbox{6}{Reserved} 
&\bitbox{1}{\tiny U\\R\\G} &\bitbox{1}{\tiny A\\C\\K} 
&\bitbox{1}{\tiny P\\S\\H} &\bitbox{1}{\tiny R\\S\\T} 
&\bitbox{1}{\tiny S\\Y\\N} & \bitbox{1}{\tiny F\\I\\N} 
& \bitbox{16}{Window} \\
\bitbox{16}{Checksum} & \bitbox{16}{Urgent Pointer}   \\
\bitbox{32}{Options}  \\
\wordbox[lrt]{1}{Payload} \\ 
\skippedwords \\ 
\wordbox[lrb]{1}{} \\ \end{bytefield}

%% UDP
centering
\begin{bytefield}{32}
\bitheader{0,7,8,15,16,23,24,31} \\
 \bitbox{16}{Source Port} & \bitbox{16}{Destination Port} \\
\bitbox{16}{Length} & \bitbox{16}{Checksum}   \\
\wordbox[lrt]{1}{Payload} \\ 
\skippedwords \\ 
\wordbox[lrb]{1}{} \\ \end{bytefield}

%% ICMP
\centering
\begin{bytefield}{32} \bitheader{0,7,8,15,16,23,24,31} \\
\bitbox{8}{Type} &\bitbox{8}{Code} \bitbox{16}{Checksum} \\
\bitbox{16}{ID} & \bitbox{16}{Sequence}   \\
\wordbox[lrt]{1}{Optional Payload} \\ 
\skippedwords \\ 
\wordbox[lrb]{1}{} \\ \end{bytefield}