Answer DHCP snooping
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filename=$(shell basename $(shell pwd))
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timestamp=$(shell date +%Y-%m-%d_%H:%M)
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all: snapshot
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snapshot: main.tex
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@latexmk -pdf main.tex
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@if ! cmp --silent build/main.pdf ${filename}_*.pdf; then \
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touch ${filename}_tmp.pdf; \
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rm ${filename}*.pdf; \
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cp build/main.pdf ${filename}_${timestamp}.pdf; \
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echo "Updated"; \
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fi
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clean:
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@rm -rf build 2>/dev/null
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\documentclass[a4paper,french,12pt]{article}
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\title{Architectures et infrastructures sécurisées \\ Exercice pratique \\ DHCP Snooping}
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\author{Tunui Franken}
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\date{Dernière compilation~: \today{} à \currenttime}
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\usepackage{styles}
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\usepackage{enumitem}
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\begin{document}
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\maketitle
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\clearpage
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\includegraphics[width=\linewidth]{./img/architecture.png}
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\begin{enumerate}
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\item Configurez R1 comme un serveur DHCP\@.
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Excluez 192.168.1.1 --- 192.168.1.9 du pool.
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Passerelle par défaut~: R1.
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\begin{lstlisting}[gobble=12]
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R1(config)#int g0/0
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R1(config-if)#ip address 192.168.1.1 255.255.255.0
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R1(config-if)#exit
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R1(config)#ip dhcp pool DHCP
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R1(dhcp-config)#network 192.168.1.0 255.255.255.0
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R1(dhcp-config)#default-router 192.168.1.1
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R1(dhcp-config)#exit
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R1(config)#ip dhcp excluded-address 192.168.1.1 192.168.1.9
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\end{lstlisting}
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\item Configurer DHCP snooping sur SW1 et SW2.
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Configurez les interfaces de liaison montantes comme des ports de confiance.
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\begin{lstlisting}[gobble=12]
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SW1(config)#ip dhcp snooping
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SW1(config)#interface range f0/1-2
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SW1(config-if-range)#ip dhcp snooping trust
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SW2(config)#ip dhcp snooping
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SW2(config)#interface range f0/1-4
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SW2(config-if-range)#ip dhcp snooping trust
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\end{lstlisting}
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\item Utilisez \texttt{ipconfig /renew} sur PC1 pour obtenir une adresse IP\@.
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Est-ce que cela fonctionne\@?
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Pourquoi ou pourquoi pas\@?
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Utilisez le mode simulation pour argumenter votre réponse.
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\begin{lstlisting}[gobble=12]
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C:\>ipconfig /renew
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IP Address......................: 192.168.1.10
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Subnet Mask.....................: 255.255.255.0
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Default Gateway.................: 192.168.1.1
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DNS Server......................: 0.0.0.0
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\end{lstlisting}
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PC1 obtient bien une adresse IP, la première adresse non exclue du range défini.
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Les deux switchs sur le chemin pour joindre le routeur transfèrent la trame encapsulant le \texttt{DHCPREQUEST}.
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Comme les ports traversés sont en mode \texttt{snooping trust}, la trame n'est pas rejetée, et le routeur peut la recevoir et la traiter.
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\item Si cela ne fonctionne pas, apportez les modifications nécessaires à la configuration pour résoudre le problème.
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Aucune modification n'est nécessaire.
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\end{enumerate}
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\end{document}
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\ProvidesPackage{styles}
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\usepackage[
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%showframe,
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a4paper,includeheadfoot,margin=2cm,top=1cm,bottom=1cm
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]{geometry}
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\setcounter{tocdepth}{2}
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\usepackage[utf8]{inputenc}
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\usepackage[T1]{fontenc}
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\usepackage{babel}
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\usepackage{datetime}
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\usepackage{color}
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\usepackage{xcolor,colortbl}
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\usepackage{amsmath}
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\usepackage{amsfonts}
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\everymath{\displaystyle}
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\newcommand*\dif{\mathop{}\!\mathrm{d}}
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\usepackage{xfrac}
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\usepackage{booktabs}
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\usepackage{tabularx}
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\newcolumntype{Y}{>{\centering\arraybackslash}X}
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\definecolor{Red}{rgb}{1,0.2,0.2}
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\newcolumntype{r}{>{\columncolor{Red}}Y}
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\usepackage{multicol}
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\usepackage{multirow}
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\usepackage{makecell}
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\usepackage{parskip}
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\usepackage{microtype}
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\usepackage{enumitem}
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\usepackage{listingsutf8}
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\lstset{%
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inputencoding=utf8/latin1,
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basicstyle=\small\ttfamily,
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columns=flexible,
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breaklines=true,
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extendedchars=true,
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literate=
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{á}{{\'a}}1 {é}{{\'e}}1 {í}{{\'\i}}1 {ó}{{\'o}}1 {ú}{{\'u}}1
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{ä}{{\"a}}1 {ë}{{\"e}}1 {ï}{{\"\i}}1 {ö}{{\"o}}1 {ü}{{\"u}}1
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{Ä}{{\"A}}1 {Ë}{{\"E}}1 {Ï}{{\"I}}1 {Ö}{{\"O}}1 {Ü}{{\"U}}1
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{â}{{\^a}}1 {ê}{{\^e}}1 {î}{{\^\i}}1 {ô}{{\^o}}1 {û}{{\^u}}1
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{Â}{{\^A}}1 {Ê}{{\^E}}1 {Î}{{\^I}}1 {Ô}{{\^O}}1 {Û}{{\^U}}1
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{Ã}{{\~A}}1 {ã}{{\~a}}1 {Õ}{{\~O}}1 {õ}{{\~o}}1 {œ}{{\oe}}1
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{Ű}{{\H{U}}}1 {ő}{{\H{o}}}1 {Ő}{{\H{O}}}1 {ç}{{\c c}}1
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{Ç}{{\c C}}1 {ø}{{\o}}1 {å}{{\r a}}1 {Å}{{\r A}}1
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{»}{{\guillemotright}}1 {ñ}{{\~n}}1 {Ñ}{{\~N}}1 {¿}{{?`}}1
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}
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\let\oldlstinputlisting\lstinputlisting
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% make \lstinputlisting always have frame
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\renewcommand{\lstinputlisting}[2][]{\oldlstinputlisting[frame=single,#1]{#2}}
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\lstnewenvironment{console}[1][]{%
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\lstset{%
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inputencoding=utf8/latin1,
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basicstyle=\small\ttfamily\color{white},
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columns=flexible,
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breaklines=true,
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extendedchars=true,
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literate=
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{á}{{\'a}}1 {é}{{\'e}}1 {í}{{\'\i}}1 {ó}{{\'o}}1 {ú}{{\'u}}1
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{Á}{{\'A}}1 {É}{{\'E}}1 {Í}{{\'I}}1 {Ó}{{\'O}}1 {Ú}{{\'U}}1
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{à}{{\`a}}1 {è}{{\`e}}1 {ì}{{\`\i}}1 {ò}{{\`o}}1 {ù}{{\`u}}1
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{À}{{\`A}}1 {È}{{\`E}}1 {Ì}{{\`I}}1 {Ò}{{\`O}}1 {Ù}{{\`U}}1
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{ä}{{\"a}}1 {ë}{{\"e}}1 {ï}{{\"\i}}1 {ö}{{\"o}}1 {ü}{{\"u}}1
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{Ä}{{\"A}}1 {Ë}{{\"E}}1 {Ï}{{\"I}}1 {Ö}{{\"O}}1 {Ü}{{\"U}}1
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{â}{{\^a}}1 {ê}{{\^e}}1 {î}{{\^\i}}1 {ô}{{\^o}}1 {û}{{\^u}}1
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{Â}{{\^A}}1 {Ê}{{\^E}}1 {Î}{{\^I}}1 {Ô}{{\^O}}1 {Û}{{\^U}}1
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{Ã}{{\~A}}1 {ã}{{\~a}}1 {Õ}{{\~O}}1 {õ}{{\~o}}1 {œ}{{\oe}}1
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{Œ}{{\OE}}1 {æ}{{\ae}}1 {Æ}{{\AE}}1 {ß}{{\ss}}1 {ű}{{\H{u}}}1
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{Ű}{{\H{U}}}1 {ő}{{\H{o}}}1 {Ő}{{\H{O}}}1 {ç}{{\c c}}1
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{Ç}{{\c C}}1 {ø}{{\o}}1 {å}{{\r a}}1 {Å}{{\r A}}1
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{€}{{\euro}}1 {£}{{\pounds}}1 {«}{{\guillemotleft}}1
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{»}{{\guillemotright}}1 {ñ}{{\~n}}1 {Ñ}{{\~N}}1 {¿}{{?`}}1,
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backgroundcolor=\color{black}, #1
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}%
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}{}
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\usepackage{graphicx}
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\usepackage[hyphens]{url}
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\usepackage[colorlinks,hidelinks]{hyperref}
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\usepackage{tikz}
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\usetikzlibrary{shapes}
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\usepackage{letltxmacro}
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\LetLtxMacro{\normalparagraph}{\paragraph}
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\renewcommand{\paragraph}[1]{\normalparagraph{#1}\mbox{}}
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\sloppy
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