\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{AlexanderHD27 (AlexanderHD27)}
\pdfinfo{
  /Title (iptables.pdf)
  /Creator (Cheatography)
  /Author (AlexanderHD27 (AlexanderHD27))
  /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}{0052A3}
\definecolor{LightBackground}{HTML}{EFF4F9}
\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}{AlexanderHD27 (AlexanderHD27)} via \textcolor{DarkBackground}{\uline{cheatography.com/162805/cs/39143/}}}
\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}AlexanderHD27 (AlexanderHD27) \\
  \uline{cheatography.com/alexanderhd27} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 7th June, 2023.\\
   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{1.224 cm} x{4.104 cm} p{0.792 cm} x{1.08 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{4}{x{8.4cm}}{\bf\textcolor{white}{Ports}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\bf{Protocol}} & {\bf{Description}} & {\bf{Port}} & {\bf{TCP/UDP}} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
FTP & File Transfer Protocol & 20,21 & TCP \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
SSH & Secure Shell & 22 & TCP \tn 
% Row Count 5 (+ 1)
% Row 3
\SetRowColor{white}
SMTP & Simple Mail Transfer Protocol & 25 & TCP \tn 
% Row Count 7 (+ 2)
% Row 4
\SetRowColor{LightBackground}
HTTP & Hypertext Transfer Protocol & 80 & TCP \tn 
% Row Count 9 (+ 2)
% Row 5
\SetRowColor{white}
DNS & Domain Name System & 53 & \seqsplit{TCP/UDP} \tn 
% Row Count 11 (+ 2)
% Row 6
\SetRowColor{LightBackground}
DHCP & Dynamic Host Configuration Protocol & 67,68 & UDP \tn 
% Row Count 13 (+ 2)
% Row 7
\SetRowColor{white}
OSPF & Open Shortest Path First & 89 & IP \tn 
% Row Count 15 (+ 2)
% Row 8
\SetRowColor{LightBackground}
POP3 & Post Office Protocol version 3 & 110 & TCP \tn 
% Row Count 17 (+ 2)
% Row 9
\SetRowColor{white}
NTP & Network Time Protocol & 123 & UDP \tn 
% Row Count 18 (+ 1)
% Row 10
\SetRowColor{LightBackground}
IMAP & Internet Message Access Protocol & 143 & TCP \tn 
% Row Count 20 (+ 2)
% Row 11
\SetRowColor{white}
BGP & Border Gateway Protocol & 179 & TCP \tn 
% Row Count 22 (+ 2)
% Row 12
\SetRowColor{LightBackground}
IS-IS & Intermediate System to Intermediate System & 149 & IP \tn 
% Row Count 24 (+ 2)
% Row 13
\SetRowColor{white}
SNMP & Simple Network Management Protocol & 161 & UDP \tn 
% Row Count 26 (+ 2)
% Row 14
\SetRowColor{LightBackground}
HTTPS & HTTP Secure & 443 & TCP \tn 
% Row Count 27 (+ 1)
% Row 15
\SetRowColor{white}
SMB & Server Message Block & 445 & \seqsplit{TCP/UDP} \tn 
% Row Count 29 (+ 2)
% Row 16
\SetRowColor{LightBackground}
L2TP & Layer 2 Tunneling Protocol & 1701 & UDP \tn 
% Row Count 31 (+ 2)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{8.4cm}{x{1.224 cm} x{4.104 cm} p{0.792 cm} x{1.08 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{4}{x{8.4cm}}{\bf\textcolor{white}{Ports (cont)}}  \tn
% Row 17
\SetRowColor{LightBackground}
PPTP & Point-to-Point Tunneling Protocol & 1723 & TCP \tn 
% Row Count 2 (+ 2)
% Row 18
\SetRowColor{white}
RTMP & Real Time Messaging Protocol & 1935 & UDP \tn 
% Row Count 4 (+ 2)
% Row 19
\SetRowColor{LightBackground}
NFS & Network File System & 2049 & \seqsplit{TCP/UDP} \tn 
% Row Count 6 (+ 2)
% Row 20
\SetRowColor{white}
RDP & Remote Desktop Protocol & 3389 & \seqsplit{TCP/UDP} \tn 
% Row Count 8 (+ 2)
% Row 21
\SetRowColor{LightBackground}
SIP & Session Initiation Protocol & 5060 & \seqsplit{UDP/TCP} \tn 
% Row Count 10 (+ 2)
% Row 22
\SetRowColor{white}
IGMP & Internet Group Management Protocol & N/A & IP \tn 
% Row Count 12 (+ 2)
% Row 23
\SetRowColor{LightBackground}
RTP & Real-time Transport Protocol & N/A & UDP \tn 
% Row Count 14 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}----}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{3.68 cm} x{4.32 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Basic Commands}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\bf{Description}} & {\bf{Description}} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
Insert & iptables -I \textless{}chain\textgreater{} {[}rule-number{]} {[}selection{]} \tn 
% Row Count 4 (+ 3)
% Row 2
\SetRowColor{LightBackground}
Replace & iptables -R \textless{}chain\textgreater{} \textless{}rule-number\textgreater{} \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
Delete & iptables -D \tn 
% Row Count 7 (+ 1)
% Row 4
\SetRowColor{LightBackground}
Append & iptables -A \tn 
% Row Count 8 (+ 1)
% Row 5
\SetRowColor{white}
List & iptables -L \tn 
% Row Count 9 (+ 1)
% Row 6
\SetRowColor{LightBackground}
Policy (Set policy) & iptables -P \textless{}chain\textgreater{} \textless{}policy\textgreater{} \tn 
% Row Count 11 (+ 2)
% Row 7
\SetRowColor{white}
Zero (Reset Counters in Chain) & iptables -Z {[}chain {[}rule{]}{]} \tn 
% Row Count 13 (+ 2)
% Row 8
\SetRowColor{LightBackground}
Flush (Delete all rules in chain) & iptables -F {[}chain{]} \tn 
% Row Count 15 (+ 2)
% Row 9
\SetRowColor{white}
New (Create user-defined chain) & iptables -N \textless{}chain-name\textgreater{} \tn 
% Row Count 17 (+ 2)
% Row 10
\SetRowColor{LightBackground}
Rename (Rename user-defined chain) & iptables -R \textless{}chain\textgreater{} \textless{}new-chain-name\textgreater{} \tn 
% Row Count 19 (+ 2)
% Row 11
\SetRowColor{white}
Help & iptables -h \tn 
% Row Count 20 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{{[}Optional Parameter{]}; \textless{}Required Parameter\textgreater{}; "selection" is composed of one or more package selectors}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{1.9 cm} x{2.812 cm} x{2.888 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{8.4cm}}{\bf\textcolor{white}{Selectors}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\bf{Description}} & {\bf{Selector}} & {\bf{Values}} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Protocol & -p \textless{}protocol\textgreater{} & tcp/udp/icmp \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
Src Address & -s \textless{}ip4 address{[}/Mask{]}\textgreater{} & Source IP4 Address \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
Dest Address & -d \textless{}ip4 address{[}/Mask{]}\textgreater{} & Destination IP4 Address \tn 
% Row Count 7 (+ 2)
% Row 4
\SetRowColor{LightBackground}
Network Interace & -i \textless{}Interface\textgreater{} & (e.g. eth0, wildcard: +) \tn 
% Row Count 9 (+ 2)
% Row 5
\SetRowColor{white}
Src Port & -{}-sport & Source Port \tn 
% Row Count 10 (+ 1)
% Row 6
\SetRowColor{LightBackground}
Dest & -{}-dport & Destination Port \tn 
% Row Count 12 (+ 2)
% Row 7
\SetRowColor{white}
{\emph{Goto}} & -g \textless{}chain\textgreater{} & Chain name \tn 
% Row Count 13 (+ 1)
% Row 8
\SetRowColor{LightBackground}
{\emph{Jump}} & -j \textless{}target\textgreater{} & ACCEPT, DROP, REJECT \tn 
% Row Count 15 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}