improved motivation

Chapters/Methodology.tex

@@ -5,7 +5,7 @@
 \label{Methodology}
 
 This chapter describes the methodology used to benchmark peer-to-peer
-overlay VPN implementations. The experimental design prioritizes
+mesh VPN implementations. The experimental design prioritizes
 reproducibility at every layer---from dependency management to network
 conditions---enabling independent verification of results and
 facilitating future comparative studies.
@@ -58,13 +58,13 @@ mesh topologies. Table~\ref{tab:vpn_selection} summarizes the selection.
     \hline
     Tailscale (Headscale) & Coordinated mesh & Open-source coordination server \\
     ZeroTier & Coordinated mesh & Global virtual Ethernet \\
-    Nebula & Lighthouse-based mesh & Slack's overlay network \\
-    Tinc & Decentralized mesh & Established since 1998 \\
+    Nebula & Coordinated mesh & Slack's overlay network \\
+    Tinc & Fully decentralized & Established since 1998 \\
     Yggdrasil & Fully decentralized & Spanning-tree routing \\
     Mycelium & Fully decentralized & End-to-end encrypted IPv6 overlay \\
     Hyprspace & Fully decentralized & libp2p-based, IPFS-compatible \\
-    EasyTier & Decentralized mesh & Rust-based, multi-protocol \\
-    VpnCloud & Decentralized mesh & Lightweight, kernel bypass option \\
+    EasyTier & Fully decentralized & Rust-based, multi-protocol \\
+    VpnCloud & Fully decentralized & Lightweight, kernel bypass option \\
     WireGuard & Point-to-point & Reference baseline (not a mesh VPN) \\
     \hline
     Internal (no VPN) & N/A & Baseline for raw network performance \\
@@ -359,6 +359,17 @@ isolated from stateful interactions typical in imperative package
 management. This property is essential for ensuring identical test
 environments across benchmark runs.
 
+\subsection{A Comparative Study on Virtual Private Networks}
+
+Lackorzynski et al.\ \cite{lackorzynski_comparative_2019} evaluate
+VPN protocols in the context of industrial communication systems (Industry 4.0),
+benchmarking OpenVPN, IPSec, Tinc, Freelan, MACsec, and WireGuard.
+Their analysis focuses on point-to-point protocol performance---throughput,
+latency, and CPU overhead---rather than overlay network behavior.
+In contrast, this thesis evaluates VPNs that provide a full data plane
+with peer-to-peer connectivity, NAT traversal, and dynamic peer discovery.
+
+
 \subsection{Full-Mesh VPN Performance Evaluation}
 
 Kjorveziroski et al.\ \cite{kjorveziroski_full-mesh_2024} provide a
@@ -377,11 +388,4 @@ This thesis extends their work in several ways:
   \item Fully reproducible experimental framework via Nix/NixOS/Clan
 \end{itemize}
 
-\subsection{Low Maintenance Peer-to-Peer Overlays}
 
-Shukla et al.\ propose integrating Software Defined Networks with
-DHT-based P2P overlays to reduce maintenance overhead
-\cite{shukla_towards_2021}. Their work on aligning overlay topology
-with physical networks is relevant to understanding the performance
-characteristics of mesh VPNs that must discover and maintain peer
-connectivity dynamically.

Chapters/Motivation.tex

@@ -75,7 +75,7 @@ evidence-based comparison of peer-to-peer overlay VPN implementations.
 Existing research on this topic remains sparse.
 One notable work from 2024, ``Full-mesh VPN performance evaluation
 for a secure edge-cloud continuum'' \cite{kjorveziroski_full-mesh_2024},
-benchmarks a subset of overlay VPNs but focuses primarily
+benchmarks a subset of mesh VPNs but focuses primarily
 on solutions with a central point of failure.
 In contrast, this thesis evaluates more widely adopted mesh VPNs
 with an emphasis on fully decentralized architectures.