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% Document Info
\author{nhatlong0605}
\pdfinfo{
  /Title (lfcs-module3-networking.pdf)
  /Creator (Cheatography)
  /Author (nhatlong0605)
  /Subject (LFCS\_Module3\_Networking Cheat Sheet)
}

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\begin{multicols}{3}
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    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
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    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{LFCS\_Module3\_Networking Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{nhatlong0605} via \textcolor{DarkBackground}{\uline{cheatography.com/68292/cs/17207/}}}
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\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
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  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}nhatlong0605 \\
  \uline{cheatography.com/nhatlong0605} \\
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 24th September, 2018.\\
   Updated 13th November, 2018.\\
   Page {\thepage} of \pageref{LastPage}.
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
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  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
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\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*}{3}

\begin{tabularx}{5.377cm}{x{2.58804 cm} x{2.38896 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Persistent Network Config in CentOS}}  \tn
% Row 0
\SetRowColor{LightBackground}
nmcli & Network Manager command line \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
nmtui & network Manger graphical \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
nmcli connection up ens33 & Switch on ens33 interface \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
\seqsplit{/etc/sysconfig/network-scripts} & Config file \tn 
% Row Count 8 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.9954 cm} x{3.9816 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Common Network Tools}}  \tn
% Row 0
\SetRowColor{LightBackground}
dig & Verify DNS relay \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
nmap & Scanning ports \tn 
% Row Count 2 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{iptables Syntax}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{iptables \{-A|I\} chain {[}-i/o iface{]} {[}-s/d ipaddr{]} {[}-p udp/tcp/icmp{[}-{}-dport/sport nn...{]}{]} -j {[}LOG|ACCEPT|DROP|REJECT{]} \newline  \newline -A|I: Append or Insert \newline -i/o: INPUT or OUTPUT chain \newline -s/d: source IP or destination IP \newline -p udp/tcp/icmp: protocol to use \newline -{}-dport/sport nn: destination port or source port \newline -j LOG|ACCEPT|DROP|REJECT: Write line to syslog or Accept or Drop silently (external traffic) or reject non-silently (internal traffic)} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.4931 cm} x{3.4839 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Configuring Local time}}  \tn
% Row 0
\SetRowColor{LightBackground}
hwclock & Display kernel hardware clock \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
hwclock -{}-systohc & Synchronise system tim to hardware time \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
hwclock -{}-hctosys & Synchronise hardware clock to system \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
timedatectl & Utilitiy to config time \tn 
% Row Count 7 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.4885 cm} x{2.4885 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{NTPD and Chronyd}}  \tn
% Row 0
\SetRowColor{LightBackground}
vim /etc/ntp.conf & Config file; Server {\emph{server name}} iburst \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
systemctl restart ntpd & Restart NTP service \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
ntpq -p & Show current time info \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
systemctl status chrony & Show current status of chrony \tn 
% Row Count 8 (+ 2)
% Row 4
\SetRowColor{LightBackground}
vim /etc/chrony.conf & Chrony config file \tn 
% Row Count 9 (+ 1)
% Row 5
\SetRowColor{white}
chronyc sources & Current time server status \tn 
% Row Count 11 (+ 2)
% Row 6
\SetRowColor{LightBackground}
chrony tracking & Current chrony tracking status \tn 
% Row Count 13 (+ 2)
% Row 7
\SetRowColor{white}
iptables -A INPUT -p udp -{}-dport 123 -j ACCEPT & Allow traffic to time server \tn 
% Row Count 16 (+ 3)
% Row 8
\SetRowColor{LightBackground}
iptables -A OUTPUT -p udp -{}-dport 123 -j ACCEPT & // \tn 
% Row Count 19 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{3.53367 cm} x{1.44333 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{IP Traffic Route}}  \tn
% Row 0
\SetRowColor{LightBackground}
route -n & IP routing table \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
ip route list & List of ip route \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
ip route add 8.8.0.0/16 proto static metric 10 via inet 10.9.185.143 dev eth0 & Add new IP route \tn 
% Row Count 7 (+ 3)
% Row 3
\SetRowColor{white}
ip route del 8.8.0.0/16 proto static metric 10 via inet 10.9.185.143 dev eth0 & Delete IP route \tn 
% Row Count 10 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.4885 cm} x{2.4885 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Firewalld}}  \tn
% Row 0
\SetRowColor{LightBackground}
firewall-cmd -{}-list-all & Show current firewall configuration \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
firewall-cmd -{}-get-services & Show current services on Firewall \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{/usr/lib/firewalld/services} & List of services config file \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
firewall-cmd -{}-add-service samba -{}-permanent & Add Samba service to Firewall persistently \tn 
% Row Count 9 (+ 3)
% Row 4
\SetRowColor{LightBackground}
firewall-cmd -{}-add-port 4000-4005/tcp -{}-permanent & Add port 4000-4005 on TCP persistently \tn 
% Row Count 12 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.53827 cm} x{2.43873 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{SSH}}  \tn
% Row 0
\SetRowColor{LightBackground}
vim \seqsplit{/etc/ssh/sshd\_config} & Config file for SSH Daemon (SSH server) \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
vim \seqsplit{/etc/ssh/ssh\_config} & Config file for SSH Client \tn 
% Row Count 5 (+ 2)
% Row 2
\SetRowColor{LightBackground}
systemctl status sshd & Current status of process \tn 
% Row Count 7 (+ 2)
% Row 3
\SetRowColor{white}
systemctl enable sshd & Start SSH at boot \tn 
% Row Count 9 (+ 2)
% Row 4
\SetRowColor{LightBackground}
ssh -X {\emph{user@ip}} & SSH with graphical application \tn 
% Row Count 11 (+ 2)
% Row 5
\SetRowColor{white}
ssh-keygen & Generating public and private key \tn 
% Row Count 13 (+ 2)
% Row 6
\SetRowColor{LightBackground}
scp /etc/hosts 192.168.4.240:/tmp (vice versa) & Copy /etc/hosts over SSH to /tmp \tn 
% Row Count 16 (+ 3)
% Row 7
\SetRowColor{white}
rsync -avz /tmp \seqsplit{student@192.168.4.240:/tmp} & Rsync from host to remote \tn 
% Row Count 19 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Config static network}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{vim \seqsplit{/etc/network-scripts/ifcfg-eht0} \newline BOOTPROTO=none \newline IPADDR=192.168.0.222 \newline PREFIX=24 \newline GATEWAY=192.168.0.1 \newline DNS1=8.8.8.8 \newline  \newline systemctl restart network} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.74195 cm} x{3.23505 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Hostname}}  \tn
% Row 0
\SetRowColor{LightBackground}
vim /etc/hostname & Hostname config file \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
hostnamectl & Tool for setting hostname \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
vim /etc/hosts & Local resolving of hostname \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
vim \seqsplit{/etc/resolv.conf} & DNS config file \tn 
% Row Count 7 (+ 2)
% Row 4
\SetRowColor{LightBackground}
vim \seqsplit{/etc/nsswitch.conf} & Specify which config file to be processed \tn 
% Row Count 9 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.4885 cm} x{2.4885 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Firewall using iptables}}  \tn
% Row 0
\SetRowColor{LightBackground}
systemctl stop firewalld & Stop Firewalld \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
iptables -L -v & List iptables policy verbosely \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
iptables -P INPUT(OUTPUT) DROP & Set INPUT(OUTPUT) to DROP \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
iptables -A INPUT -i lo -j ACCEPT & Allow incoming traffic to loopback interface \tn 
% Row Count 9 (+ 3)
% Row 4
\SetRowColor{LightBackground}
iptables -A OUTPUT -o lo -j ACCEPT & Allow outgoing traffic to loopback interface \tn 
% Row Count 12 (+ 3)
% Row 5
\SetRowColor{white}
iptables -A INPUT -p tcp -{}-dport 22 -j ACCEPT & Allow packet through port on TCP going to system \tn 
% Row Count 15 (+ 3)
% Row 6
\SetRowColor{LightBackground}
iptables -A OUTPUT -m state -{}-state ESTABLISHED, RELATED -j ACCEPT & Allow all old to get out of system; doesn't all new traffic \tn 
% Row Count 19 (+ 4)
% Row 7
\SetRowColor{white}
iptables -A OUTPUT -p tcp -{}-dport 22 -j ACCEPT & // \tn 
% Row Count 22 (+ 3)
% Row 8
\SetRowColor{LightBackground}
iptables -A INPUT -m state -{}-state ESTABLISHED, RELATED -j ACCEPT & // \tn 
% Row Count 26 (+ 4)
% Row 9
\SetRowColor{white}
iptables -A OUTPUT -p tcp -{}-dport 80 -j ACCEPT & Allow TCP traffic going out through port 80 \tn 
% Row Count 29 (+ 3)
% Row 10
\SetRowColor{LightBackground}
iptables -A OUTPUT -p udp -{}-dport 53 -j ACCEPT & Allow traffic going out through DNS (port 53) \tn 
% Row Count 32 (+ 3)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{5.377cm}{x{2.4885 cm} x{2.4885 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Firewall using iptables (cont)}}  \tn
% Row 11
\SetRowColor{LightBackground}
iptables-save \textgreater{} \seqsplit{/etc/sysconfig/iptables} & Save iptables to start automatically at boot \tn 
% Row Count 3 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}