OMNET++ Mixnet Framework

Yuping Dong12/14/10

What is Mixnet and Why?

• INET: wired and wireless protocols• MiXiM: mobile and fixed wireless networks• Mixnet: using both MiXiM and INET– INET: Network layer and above– MiXiM: 802.11NIC and mobility

What Mixnet can(not) do?

• MiXiM NIC with INET IP stack• INET APP• MiXiM mobility modules• INET non-wireless NICs• Both blackboard modules• INET wireless modules• Exchange info between both blackboards

Prerequisites

• inet4mixnet http://github.com/mixim/inet4mixnet

• MiXiM-2.0.1 sourceforge.net/projects/mixim

Mixnet Modules

• MixnetBridge– Connects INET network layer with MiXiM NIC

• MixnetWorldUtility– Mapping between INET and MiXiM MAC

addresses– Blackboard

MixnetBridge

• Registers NIC in INET’s ift• Converts INET control info to MiXiM control

info• Forwards lower msg• Converts MAC addresses between INET and

MiXiM• Stores MAC address pairs to

MixnetWorldUtility

Mixnet WorldUtility

• Extends blackboard functionality– Cross-layer info exchange– publisher -publish(BBItem)-> Blackboard -

notify(BBItem)--> subscriber– Playground size, shape, dimension, etc.– Check connection manager

Mixnet Nodes

• IEEE802.11 nodes• IEEE802.15.4 nodes

IEEE 802.11 Nodes

IEEE 802.15.4 Nodes

Network Layer

• IP: Implements IP protocol• ICMP: Relies on IP to send error msg, query msg. ping tool, traceroute.• IGMP: Establish multicast group memebership• ARP: Converts IP address to MAC address• ErrorHandling: Error notification from other modules

Mixnet Example: Ad Hoc Network

• ConnectionManager:• Coordinates connection between all

nodes.• Calculates max interference distance.

• World:• Map INET MiXiM MAC address• Get PG size• Check connection manager

• Configurator:• Configure IP addresses and routing

tables.• Host:• IEEE802.11 hosts

4-Stage Initialization

• Stage 0– WorldUtility: get pg size– Register interfaces in InterfaceTable– MixnetBridge:• Map input output gates• Register MAC address pair

– RoutingTable:• NF status

4-Stage Initialization

• Stage 1– RoutingTable:• Create per-interface IPv4 data structures• Read RoutingTable file & interface configuration• Set RouterId

– WorldUtility: check connection manager

4-Stage Initialization

• Stage 2– Configurator:• Configures IP addresses and routing tables for a flat

network– Assign IP addresses to hosts & routers– Calculate shortest paths– Add routes to routing tables

4-Stage Initialization

• Stage 3– RoutingTable:• Configure RouterId• Update routes

Interface Table

• Table of network interfaces• Protocol-independent properties only

RoutingTable

• RouterId empty for hosts• Loopback address as RouterId for routers

Research Robots

• SumoBot• iRobot

SumoBot• Two SumoBot Robots wrestling.• BASIC Stamp microcontroller• Line sensors detect border• IR sensors detect opponent’s position• Breadboard on top, can extend apps• RS232 to communicate with host• Compatible RF transceiver, plug to breadboard• $239.99/set + $39.99/transceiver

iRobot Create

• USB communication• Can store 100 open interface commands• 30 built-in sensors• 25 pin expansion port • C++ programming• $219.99 each• Possible to wire the previous RF transceiver to iRobot Create• Can add parts to the slot