05-03-2012, 04:54 PM
A MANET Architecture Model
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R´esum´e : Ce m´emorandum documente une erreur de perception r´epandue concernant
les r´eseaux MANET et leur architecture r´eseau sous-jacente, lorsqu’ils sont integr´es
`a des r´eseaux IP classiques. Il d´ecrit les cons´equences de cette erreur de perception –
l’incompatibilit´e avec les protocoles et applications pr´eexistants – et propose un mod`ele
d’architecture pour ces reseaux MANETs, qui les int`egre `a l’architecture des r´eseaux IP et
encapsule la partie du comportement qui est sp´ecifique aux MANETs, de sorte qu’il paraissent
transparent aux applications et aux protocoles existants. Enfin, ce m´emorandum
montre comment le modele architectural de MANET convient aux scenarii de deploiement
des MANETs, en particulier les MANETs simples, et aussi a la gestion des reseaux NEMO
integres.
Mots-cl´es : r´eseaux mobiles, r´eseaux ad-hoc, architecture de r´eseau, configuration d’adresses,
protocole de routage, r´eseaux IP, NEMO, MANET
Introduction & Background
A typical text on Mobile Ad hoc NETworks (MANETS) will describe such networks as
simply being ”a collection of mobile nodes, communicating among themselves over wireless
links and thereby forming a dynamic, arbitrary graph” – listing wireless characteristics and
graph dynamics as the main challenges for designing protocols and applications for this
network.
While capturing important characteristics, this description does not make explicit how
MANETs map into the Internet architecture – and does therefore not allow evaluation of
existing IP protocols and their applicability on MANETs. Similarly, the lack of a clear
architectural description within the context of the Internet has impeded the evaluation of
the applicability of MANETs within the Internet.
Memorandum Outline
The remainder of this memorandum are organised as follows: section 2 provides an overview
of the classic IP page link and network model, in particular the assumptions made by IP regarding
subnets and links. Section 3 then elaborates important characteristics regarding MANET
interfaces, comparing and contrasting with the IP assumptions of section 2. This is followed
by section 4, in which a common misperception of the MANET architecture is elaborated,
and where the shortcomings of this architectural misperception are presented.
MANET Interface Characteristics
MANET nodes are equipped with MANET interfaces, which have different characteristics
than the interfaces described for the classic IP Link and Network Model in section 2. These
characteristics are briefly summarised in this section, with the purpose of exemplifying the
difference with ”Ethernet-like” interfaces.
