Architecture

1
Architecture
Core
2
CORE Module Implementation

• Layer 2 sniffer
• WLAN card set in promiscuous mode
• Implemented using pcap libraries
  (www.tcpdump.org/pcap.htm)
• CORE Watchdog
• Observes sniffed packets to maintain reputation
  information
• Takes forwarding decisions according to reputation

3
Reputation Buffer
B4
a
c
b
Obs(k-3) Obs(k-2) Obs(k-1) Obs(k)
Node a
Node c
4
CORE Module Example

• Node a wants to send a packet to node c
• Node a knows route to node c
• R lta,b,cgt

5
CORE Module example

• If a node cooperates we insert a 1 value in the
  reputation buffer.

MACa
MACb
pl
a
b
c
MACb
MACc
pl
MACb
MACc
pl
Hash(pl)
Expectations table
Dst
Hash
Src
At k node b is cooperating ? Obs (k) 1
MACb
MACc
Hash(pl)
6
CORE Module Open Issues

• Setting up a test environment
• Compatibility (drivers, WLAN cards, Linux) and
  operability nightmare. ?Suggestions are welcome!
  
• Integration of CORE in HUT framework
• Neighbors discovery?

7
Test Environment

• Compaq iPaq 3950
• Familiar Linux
• Cisco Aironet 350 (to be confirmed)
• Ad-Hoc Mode

• Laptop
• Windows XP
• Dell TrueMobile 1150
• Ethereal

8
CORE Module To Do

• Implementation of functional reputation
• Cross layer design
• Definition of relationship between middleware and
  CORE