top1
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This is pdfTeX, Version 3.141592653-2.6-1.40.26 (TeX Live 2025/dev/Debian) (preloaded format=pdflatex 2025.5.15) 15 MAY 2025 11:32
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This is pdfTeX, Version 3.141592653-2.6-1.40.26 (TeX Live 2025/dev/Debian) (preloaded format=pdflatex 2025.5.15) 27 MAY 2025 08:35
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**main.tex
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LaTeX2e <2024-11-01> patch level 2
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L3 programming layer <2025-01-18>
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***********
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L3 programming layer <2025-01-18>
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***********
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@ -268,4 +268,89 @@ If \texttt{dnsmasq} fails to start:
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\section{Conclusion}
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This guide configures \texttt{dnsmasq} as a DNS and DHCP server in an Incus container on Debian. The \texttt{link.py} script and Netplan configuration ensure a robust network setup with veth pairs and static IP addressing. For advanced configurations, refer to the \texttt{dnsmasq} documentation (\texttt{man dnsmasq}) and \texttt{pyroute2} documentation.
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\appendix
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\section{Test Topology – Dynamic\ IP Variant}
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\label{sec:topo-dhcp}
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\subsection{Logical view}
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\begin{verbatim}
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+------------------+
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| Laptop / PC |
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| (browser) |
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| DHCP client |
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+--------+---------+
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| (br0 – 10.10.10.0/24)
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---------- ns1 (host) ---+-------------------------------
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br0 (DHCP) |
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+-----------------+-------------------+
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| |
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+-------+--------+ +------+-------+
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| dnsmasq-ct | | web-ct |
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| 10.10.10.2/24 | | DHCP client |
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| DHCP + DNS | | :1111/tcp |
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+----------------+ +--------------+
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\end{verbatim}
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\end{verbatim}
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\subsection{Key differences from the static-IP variant}
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\begin{itemize}
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\item \textbf{Host bridge \texttt{br0}}
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\begin{itemize}
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\item Utwórz most, ale \emph{nie} przypisuj mu ręcznie adresu:
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\begin{lstlisting}[language=bash]
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sudo ip link add name br0 type bridge
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sudo ip link set br0 up
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sudo dhclient -v br0 # pobiera lease od dnsmasq-ct
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\end{lstlisting}
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\end{itemize}
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\item \textbf{\texttt{dnsmasq.conf}} (w dnsmasq-ct)
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Bez zmian poza tym, że opcja \texttt{dhcp-option 3} (gateway) wskazuje teraz
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na \textit{aktualny} adres hosta br0, nadany dynamicznie. Najprostsze
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rozwiązanie w labie: pozostaw ten wiersz pominięty — wszystkie testowe
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maszyny działają wewnątrz jednej podsieci i nie muszą wychodzić na świat.
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\item \textbf{web-ct – Netplan}
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Usuń plik \texttt{/etc/netplan/00-static.yaml} i zostaw domyślną konfigurację
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\texttt{dhcp4: yes}:
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\begin{lstlisting}[language=bash]
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incus exec web-ct -- rm /etc/netplan/00-static.yaml
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incus exec web-ct -- bash -c 'printf "%s\n" \
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"network:" " version: 2" " ethernets:" \
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" eth0:" " dhcp4: yes" > /etc/netplan/01-dhcp.yaml'
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incus exec web-ct -- netplan apply
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\end{lstlisting}
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\item \textbf{Host ns1 jako klient DNS}
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\begin{lstlisting}[language=bash]
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sudo bash -c 'echo "nameserver 10.10.10.2" > /etc/resolv.conf'
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\end{lstlisting}
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\end{itemize}
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\subsection{Quick test matrix}
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\begin{tabular}{l l l}
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\textbf{Sprawdzenie} & \textbf{Polecenie} & \textbf{Oczekiwany wynik} \\
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\hline
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Lease br0 & \verb|ip -4 a show br0| & adres 10.10.10.\emph{N} \\
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DNS – strona.pl & \verb|dig +short strona.pl| & 10.10.10.\emph{X} (web-ct) \\
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HTTP & przeglądarka → \verb|http://strona.pl:1111| & treść web-ct \\
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\end{tabular}
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\subsection{Uwagi}
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\begin{itemize}
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\item W środowisku produkcyjnym upewnij się, że dnsmasq ma wpis \verb|dhcp-option=3| z
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poprawnym adresem bramy lub skonfiguruj statyczną trasę domyślną.
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\item Jeśli potrzebujesz stałego adresu dla web-ct, użyj
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\verb|dhcp-host=| w \texttt{dnsmasq.conf}, np.:
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\verb|dhcp-host=mac:AA:BB:CC:DD:EE:FF,10.10.10.3|
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\end{itemize}
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\clearpage
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\end{document}
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