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doc/main.tex

@@ -32,20 +32,6 @@
   morestring=[b]{'}
 }
 
-% Define Python language for listings
-\lstdefinelanguage{python}{
-  keywords={def,class,import,from,as,try,except,with,return,raise,if,elif,else,for,in,while,break,continue},
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-
 \begin{document}
 
 \title{Basic Configuration of dnsmasq in an Incus Container on Debian with Netplan}
@@ -54,14 +40,13 @@
 \maketitle
 
 \section{Introduction}
-This guide provides step-by-step instructions for setting up \texttt{dnsmasq} as a DNS and DHCP server in an Incus container running Debian. The network configuration is managed using Netplan and a custom Python script to create virtual Ethernet (veth) pairs and bridges, ensuring proper network integration.
+This guide provides step-by-step instructions for setting up \texttt{dnsmasq} as a DNS and DHCP server in an Incus container running Debian. The network configuration is managed using Netplan to ensure proper network integration.
 
 \section{Prerequisites}
 Before proceeding, ensure the following:
 \begin{itemize}
   \item Incus is installed on the host system (\texttt{sudo apt install incus}).
   \item A Debian-based container is created in Incus.
-  \item Python 3 and the \texttt{pyroute2} package are installed on the host (\texttt{sudo apt install python3 python3-pyroute2}).
   \item Basic knowledge of Linux networking and container management.
   \item Root or sudo access to the host and container.
 \end{itemize}
@@ -122,48 +107,8 @@ incus exec dnsmasq-container -- apt update
 incus exec dnsmasq-container -- apt install dnsmasq -y
 \end{lstlisting}
 
-\subsection{Configuring Network with Veth Pairs and Netplan}
-To enable advanced networking, use the provided Python script (\texttt{link.py}) to create a virtual Ethernet (veth) pair connecting the container to the host's network namespace, with an optional bridge for network integration. Save the following script as \texttt{link.py} on the host:
-
-\begin{lstlisting}[language=python]
-import argparse
-import os
-import subprocess
-import sys
-from pyroute2 import IPRoute, NetNS
-
-# ... (rest of the link.py script as provided) ...
-\end{lstlisting}
-
-Run the script to create a veth pair, move one end to the container's network namespace, and attach it to a bridge on the host. First, identify the container's name or ID:
-\begin{lstlisting}[language=bash]
-incus list
-\end{lstlisting}
-Assuming the container name is \texttt{dnsmasq-container}, execute the script with sudo privileges:
-\begin{lstlisting}[language=bash]
-sudo python3 link.py -t1 incus -ns1 dnsmasq-container -n1 veth-container -t2 1 -n2 veth-host -b2 br0
-\end{lstlisting}
-
-\textbf{Explanation:}
-\begin{itemize}
-  \item \texttt{-t1 incus}: Specifies that the first namespace is an Incus container.
-  \item \texttt{-ns1 dnsmasq-container}: Specifies the container's network namespace (Incus container name).
-  \item \texttt{-n1 veth-container}: Names the veth interface inside the container.
-  \item \texttt{-t2 1}: Specifies the default (host) namespace.
-  \item \texttt{-n2 veth-host}: Names the veth interface on the host.
-  \item \texttt{-b2 br0}: Attaches the host's veth interface to a bridge named \texttt{br0}.
-\end{itemize}
-
-Before running the script, ensure the bridge \texttt{br0} exists on the host. Create it if necessary:
-\begin{lstlisting}[language=bash]
-sudo ip link add name br0 type bridge
-sudo ip link set br0 up
-\end{lstlisting}
-
-The script exposes the container's network namespace, creates the veth pair, moves \texttt{veth-container} to the container's namespace, attaches \texttt{veth-host} to \texttt{br0}, and brings both interfaces up.
-
 \subsection{Configuring the Network with Netplan}
-Configure the container's network using Netplan to assign a static IP address to the \texttt{veth-container} interface (aliased as \texttt{eth0} for simplicity). Create or edit the Netplan configuration file at \texttt{/etc/netplan/01-netcfg.yaml} inside the container:
+Configure the container's network using Netplan to assign a static IP address. Create or edit the Netplan configuration file at \texttt{/etc/netplan/01-netcfg.yaml}:
 \begin{lstlisting}[language=bash]
 incus exec dnsmasq-container -- nano /etc/netplan/01-netcfg.yaml
 \end{lstlisting}
@@ -173,8 +118,6 @@ network:
   version: 2
   ethernets:
     eth0:
-      match:
-        name: veth-container
       dhcp4: no
       addresses:
         - 192.168.1.10/24
@@ -184,27 +127,11 @@ network:
       nameservers:
         addresses: [8.8.8.8, 8.8.4.4]
 \end{lstlisting}
-
-\textbf{Explanation:}
-\begin{itemize}
-  \item \texttt{match: name: veth-container}: Matches the \texttt{veth-container} interface created by the script, aliased as \texttt{eth0}.
-  \item \texttt{dhcp4: no}: Disables DHCP to use a static IP.
-  \item \texttt{addresses}: Assigns the static IP \texttt{192.168.1.10/24}.
-  \item \texttt{routes}: Sets the default gateway to \texttt{192.168.1.1}.
-  \item \texttt{nameservers}: Specifies Google's DNS servers.
-\end{itemize}
-
 Apply the configuration:
 \begin{lstlisting}[language=bash]
 incus exec dnsmasq-container -- netplan apply
 \end{lstlisting}
 
-Verify the network configuration:
-\begin{lstlisting}[language=bash]
-incus exec dnsmasq-container -- ip a show eth0
-incus exec dnsmasq-container -- ping 8.8.8.8
-\end{lstlisting}
-
 \subsection{Configuring dnsmasq}
 Edit the \texttt{dnsmasq} configuration file at \texttt{/etc/dnsmasq.conf}:
 \begin{lstlisting}[language=bash]
@@ -254,7 +181,7 @@ Test DNS resolution from within the container:
 \begin{lstlisting}[language=bash]
 incus exec dnsmasq-container -- nslookup example.local 192.168.1.10
 \end{lstlisting}
-To test DHCP, connect a client device to the same network (via the \texttt{br0} bridge) and verify that it receives an IP address in the range \texttt{192.168.1.100--192.168.1.200}.
+To test DHCP, connect a client device to the same network and verify that it receives an IP address in the range \texttt{192.168.1.100--192.168.1.200}.
 
 \section{Troubleshooting}
 If \texttt{dnsmasq} fails to start:
@@ -262,10 +189,9 @@ If \texttt{dnsmasq} fails to start:
   \item Check the logs: \texttt{incus exec dnsmasq-container -- journalctl -u dnsmasq}.
   \item Ensure no other service is using port 53 (DNS) or 67 (DHCP).
   \item Verify the network configuration with \texttt{incus exec dnsmasq-container -- ip a} and \texttt{incus exec dnsmasq-container -- ping 8.8.8.8}.
-  \item Confirm the veth pair and bridge setup: \texttt{ip link show} on the host and \texttt{incus exec dnsmasq-container -- ip link show}.
 \end{itemize}
 
 \section{Conclusion}
-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.
+This guide configures \texttt{dnsmasq} as a DNS and DHCP server in an Incus container on Debian. The Netplan configuration ensures proper network setup. For advanced configurations, refer to the \texttt{dnsmasq} documentation (\texttt{man dnsmasq}).
 
 \end{document}