\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
\usepackage[T1]{fontenc}        % Without this we get weird character replacements
\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{apavanello}
\pdfinfo{
  /Title (iptables.pdf)
  /Creator (Cheatography)
  /Author (apavanello)
  /Subject (iptables Cheat Sheet)
}

% Lengths and widths
\addtolength{\textwidth}{6cm}
\addtolength{\textheight}{-1cm}
\addtolength{\hoffset}{-3cm}
\addtolength{\voffset}{-2cm}
\setlength{\tabcolsep}{0.2cm} % Space between columns
\setlength{\headsep}{-12pt} % Reduce space between header and content
\setlength{\headheight}{85pt} % If less, LaTeX automatically increases it
\renewcommand{\footrulewidth}{0pt} % Remove footer line
\renewcommand{\headrulewidth}{0pt} % Remove header line
\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
% This two commands together give roughly
% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
\onehalfspacing

% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
\newcolumntype{x}[1]{>{\raggedright}p{#1}} % New column types for ragged-right paragraph columns
\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
\definecolor{HeadBackground}{HTML}{333333}
\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{BABABA}
\definecolor{LightBackground}{HTML}{F6F6F6}
\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{iptables Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{apavanello} via \textcolor{DarkBackground}{\uline{cheatography.com/59386/cs/15576/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}apavanello \\
  \uline{cheatography.com/apavanello} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 7th July, 2021.\\
   Updated 7th July, 2021.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{2}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Composição do comando}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{iptables {[}-t {\emph{tabela}}{]} {[}opção{]} {[}chain{]} {[}dados{]} -j {[}ação{]} \newline  \newline Sendo  \newline   {[}-t {\emph{tabela}}{]}  -\textgreater{} a tabela a ser criada, filter é a default \newline   {[}opção{]} -\textgreater{} Opções como criar ou deletar regras \newline   {[}chain{]} -\textgreater{}  Chain a ser usada   \newline   {[}dados{]} -\textgreater{} Destinos e origens  \newline   -j {[}ação{]} -\textgreater{} Ação a fazer com o pacote \newline  \newline  \newline Ex.: iptables -t filter -A FORWARD -d 192.168.1.1 -j DROP \newline \#Dropa todos os pacotes que devem ser encaminhados para o 192.168.1.1} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{p{1.04 cm} x{6.96 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Tabelas}}  \tn
% Row 0
\SetRowColor{LightBackground}
\seqsplit{filter} & Tabela default, faz filtragem dos pacotes simples \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
nat & Efetua as operações com nat \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{mangle} & para alterações avançadas nos pacotes \tn 
% Row Count 5 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{{\bf{Na ausencia do parametro de tabela, a tabela filter é selecionada}} \newline {\bf{As tabelas são sempre escritas no comando na forma minuscula}} \newline Ex.: \newline `iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE` \newline regra para abilitar o nat na porta eth0}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{1.76 cm} x{6.24 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Chains}}  \tn
% Row 0
\SetRowColor{LightBackground}
INPUT & Regras que atuarão na entrada de pacotes no FW \{\{nl\}\} Tabelas Filter e Mangle \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
FORWARD & Regras que atuarão no redirecionamento de pacotes no FW \{\{nl\}\} Tabelas Filter e Mangle \tn 
% Row Count 6 (+ 3)
% Row 2
\SetRowColor{LightBackground}
OUTPUT & Regras que atuarão no saida de pacotes no FW \{\{nl\}\} Tabelas Filter, Mangle e NAT \tn 
% Row Count 9 (+ 3)
% Row 3
\SetRowColor{white}
\seqsplit{PREROUTING} & Regras que atuarão no pacote antes do processo de roteamento \{\{nl\}\} Tabelas NAT e Mangle \tn 
% Row Count 12 (+ 3)
% Row 4
\SetRowColor{LightBackground}
\seqsplit{POSTROUTING} & Regras que atuarão no pacote depois do processo de roteamento \{\{nl\}\} Tabelas NAT e Mangle \tn 
% Row Count 15 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{{\bf{INPUT e OUTPUT a origem é o próprio FW}} \newline {\bf{FORWARD o pacote passa através do FW}} \newline Chains são sempre escrita em {\bf{MAIÚSCULO}}}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{2.48 cm} x{5.52 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Comandos Basicos - Visualizar Regras}}  \tn
% Row 0
\SetRowColor{LightBackground}
iptables -L & Lista as regras da tabela {\bf{FILTER}} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
iptables -t nat -L & Lista as regras da tabela {\bf{NAT}} \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
iptables -L -n & Lista as regras da tabela {\bf{FILTER}} sem resolver os nomes e numeros de portas \tn 
% Row Count 7 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{Ao não definir uma tabela a filter é a {\bf{padrão}} \newline Atenção para letras maiúsculas e minúsculas}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{2.32 cm} x{5.68 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Comandos Basicos - Criar Regras}}  \tn
% Row 0
\SetRowColor{LightBackground}
-A {\emph{chain}} & Cria a regra na CHAIN informada \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
-I {\emph{chain}} {\emph{num}} & Cria a regra na {\emph{chain}} informada e coloca na posição {\emph{num}} \tn 
% Row Count 5 (+ 3)
% Row 2
\SetRowColor{LightBackground}
-d {\emph{IP}} & IP de destino \tn 
% Row Count 6 (+ 1)
% Row 3
\SetRowColor{white}
-s  {\emph{IP}} & IP de origem \tn 
% Row Count 7 (+ 1)
% Row 4
\SetRowColor{LightBackground}
-p {\emph{protocolo}} & protocolo (TCP, UDP, ICMP) \tn 
% Row Count 9 (+ 2)
% Row 5
\SetRowColor{white}
-{}-sport {\emph{porta}} & Porta de origem (necessario usar junto do -p) \tn 
% Row Count 11 (+ 2)
% Row 6
\SetRowColor{LightBackground}
-{}-dport {\emph{porta}} & Porta de destino (necessario usar junto do -p) \tn 
% Row Count 13 (+ 2)
% Row 7
\SetRowColor{white}
-i {\emph{int}} & Interface de entrada de dados(ex.: ETH0) \tn 
% Row Count 15 (+ 2)
% Row 8
\SetRowColor{LightBackground}
-o {\emph{int}} & Interface de saida de dados(ex.: ETH0) \tn 
% Row Count 17 (+ 2)
% Row 9
\SetRowColor{white}
-j {\emph{ação}} & ação a ser tomada (ACCEPT, REJECT,DROP) \tn 
% Row Count 19 (+ 2)
% Row 10
\SetRowColor{LightBackground}
-D {\emph{num}} & Deleta a regra de numero {\emph{num}} \tn 
% Row Count 21 (+ 2)
% Row 11
\SetRowColor{white}
-F & apaga todas as regras \tn 
% Row Count 22 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{Substituir o que este em {\emph{itálico}} pela opção informada \newline ex.:  -A {\emph{chain}}  na INPUT ficaria: \newline {\bf{iptables -A INPUT}}}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{1.6 cm} x{6.4 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{AÇÕES}}  \tn
% Row 0
\SetRowColor{LightBackground}
ACCEPT & Aceita os pacotes \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
DROP & Descarta o pacote \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
REJECT & Rejeita o pacote \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
\seqsplit{MASQUERADE} & Usado na tabela NAT para aplicar a mascara NAT \tn 
% Row Count 5 (+ 2)
% Row 4
\SetRowColor{LightBackground}
DNAT & efetua o nat reverso, é necessario usar junto do comando -{}-to-destination {\emph{IP:port}} \tn 
% Row Count 8 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}