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\begin{document}
\title{Loop freedom of the (untimed) AODV routing protocol}
\author{Timothy Bourke\thanks{Inria,
\'Ecole normale sup\'erieure,
and NICTA}
\and
Peter H\"ofner\thanks{NICTA
and Computer Science and Engineering, UNSW}}
\maketitle
\begin{abstract}
The Ad hoc On-demand Distance Vector (AODV) routing protocol~\cite{RFC3561}
allows the nodes in a Mobile Ad hoc Network (MANET) or a Wireless Mesh
Network (WMN) to know where to forward data packets. Such a protocol is
`loop free' if it never leads to routing decisions that forward packets in
circles.
This development mechanises an existing pen-and-paper proof of loop freedom
of AODV~\cite{FehnkerEtAl:AWN:2013}.
The protocol is modelled in the Algebra of Wireless Networks (AWN),
which is the subject of an earlier paper~\cite{BourkeEtAl:MechAWN:2014} and
mechanization~\cite{Bourke14}.
The proof relies on a novel compositional approach for lifting invariants to
networks of nodes.
We exploit the mechanization to analyse several variants of AODV and show
that Isabelle/HOL can re-establish most proof obligations automatically and
identify exactly the steps that are no longer valid.
Each of the variants is essentially a modified copy of the main development.
Further documentation is available in~\cite{BourkevGlHof:ATVA:2014}.
\centering{\includegraphics[width=\textwidth]{session_graph}}
\end{abstract}
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