Transcript Christopher Wilder - P2P Over MANET

P2P Over MANET
An Introduction to Mobile
Resource Sharing
Introduction to MANETs
• Mobile Ad Hoc Network (MANET)
• Under research for the past 10 years
• Only a small amount of MANETs are currently used in
the real world
• Autonomous system of mobile routers and nodes
• All elements reside on wireless domains
• Nodes can join and leave the network at any time
• Dynamic topology
• Wireless connectivity implements node mobility
• Primarily operates in the network layer (layer 3), but can
be implemented in other layers as well
MANET Interface
• Connecting point where nodes can attach[1]
• Allows MANETs to connect to each other
• Every MANET interface must have a
unique identifier
• Neighborhood
• Time-varying asymmetric Reachability[1]
MANET Neighbors
N3
N4
N2
MR1
MR2
MR3
N1
N5
MR4
N6
MANET Asymmetric Readability
N3
N4
N2
MR3
MR1
N6
N1
N5
MR2
MR4
MANET Router (MR)
• Has one or more MANET interfaces
• May have zero or more non-MANET
interfaces [1]
• Hides MANET characteristics from all
nodes that do not support MANET
• Only one MR is required to setup a
MANET, however, the more the better
MANETs and Other Wireless
Network Technologies
• IEEE 802.11 (WI-FI) can not be used to implement a
MANET, they do not share characteristics
• WI-FI is just a wireless version of a wired network[3]
• The two main differences in WI-FI and MANETs:
– WI-FI operates in the data-link layer (layer 2) and MANETs must
exist in the network layer
– Access points are required for a WI-FI network to effectively
work, which is a rule that is not bound to MANETs
• Bluetooth has been successfully used to implemented a
MANET
MANETs and Existing Wired
Networks
• Can be implemented as an overlay on top of any wired
topology or network
• Routers which support intercommunication can have two
or more interfaces including MANET interface
• Specific MANET routing protocols are used to route
traffic across its network
• MANET packets are encapsulated in IP packets and vice
versa
• In an MANET overlay, a node on the MANET network
can communication with a node located on an IP
network. This transformation is bi-directional
Asymmetric Reachability
MR1
MR2
MR3
Peer to Peer (P2P)
• An Overview of P2P will start here and
continue for the next 3 to 5 slides
P2P Over MANET
• A mobile ad hoc network with a peer to
peer overly
• The MANET will operate in the first four
layers of the OSI model, while P2P will run
in the fourth through seventh layer
• Both inhibit similar characteristics
• Next generation of client based networks
P2P Over MANET
• Can be implemented in more than one way considering
that:
– There is more than one MANET protocol
– P2P can be built as a structured, unstructured, data-centric,
overlay, or hybrid architecture.
– Each P2P architecture has a multitude of protocols and
characteristics which inhibit different features and constraints
• A structured P2P architecture works best with MANETs
• Structured P2P uses Distributed Hash Tables (DHT),
which there are many to choose from with different
characteristics i.e. Chord, Pastry, etc.
P2P Over MANET Protocol Stack
OSI
P2P
Application
Application
Presentation
Presentation
Session Layer
MANET
Session Layer
Transport
Transport
Transport
Network
Network
Data-link
Data-link
Physical
Physical
Homogeneous Characteristics of
P2P and MANET
• Supports node churning[2]; consistency of nodes
entering and leaving the network
• Traffic patterns closely resemble those caused
by multi-hop broadcasting or multicasting [3]
• Dynamic topology
• The ability for nodes to rearrange themselves
when connecting to the network
• Fault tolerant; resistant and transparent to errors
• Unique Identifiers are required to identify nodes
Why P2P Over MANET
• Put some good stuff to say here about the
benefits of P2P Over MANET
P2P Over MANET Architectures
• The P2P Over MANET description of
architectures starts here and will continue
for the next 3 to 5 slides.
Example of P2P Over MANET
Architecture
• This slides starts the description of
example and will continue for the next 4 to
6 slides
Typical Problems with P2P Over
MANET
• Put some things that need to be fixed with
P2P Over MANET here
Possible Applications for P2P Over
MANET
• The applications for P2P Over MANET
starts here and continues for maybe one
more slide
References
• References will go here