OMNET++
Mixnet Framework
Yuping Dong
12/14/10
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