1. Evaluation of a Large-Scale Topology Discovery Aglorithm
Benoit Donnet
joint work with Brad Huffaker, Timur Friedman
and kc claffy
IPOM Dublin

2. Research Context Network Measurement Internet topology discovery
IP interface level
large-scale
Existing tools
skitter (CAIDA) / scamper (WAND)
TTM (RIPE) / AMP (NLANR)
Rocketfuel / Scriptroute (U. Washington)
DIMES (U. Tel Aviv)

3. Motivations
Build the graph of the internet ([Pastor-Satorras & Vespignani])
Simulations input
Network Management ([Siamwalla et al.])
Data replication over different machines ([Qiun et al. - INFOCOM01])

4. Large-scale discovery
Power law distribution of router degree ([Faloutsos et al. - SIGCOMM99])
Measurement biais
Experimental proof ([Lakhina et al. - INFOCOM03])
Analytical proof ([Clauset & Moore - arXiv cond- mat/ ])
Solution?
Topology discovery using a large set of traceroute-like monitors
Doubletree ([Donnet et al. - SIGMETRICS05)

5. Contributions Doubletree implementation traceroute@home Java
Open-source (BSD-like license)
Freely available ([
Doubletree evaluation
PlanetLab testbed

6. Doubletree Aims at reducing The probing redundancy The DDoS risk
Starts probing at some midpoint h in the network
Forward probing from h
Backward probing from h-1

7. Doubletree (2)

8. Doubletree (3) Takes advantage of the tree-like structure of routes
Uses stop sets {(interface, root)}
Local stop set: {interface}
Backward probing
Global stop set: {(interface, destination)}
Forward Probing
Must be shared between monitors

9. Doubletree (4)
Monitor 1: h <= 3
Monitor 2: h <= 2 10

10. Doubletree (5)
Doubletree explains what must be shared between monitors
The global stop set
But no how to share information

11. Doubletree (5)

12. Experimental Setup PlanetLab testbed Ten monitors
USA, Canada, France, Spain, Switzerland, Japan and Korea
200 destinations
Randomly selected among the 300 institutions
Measurements run on Dec. 20th 2005

13. Stopping Reasons

14. Stopping Distance

15. Running Time

16. States Interactions

17. Future Works Measurement Infrastructures
Many security concerns ([COMNI2005])
OneLab ([
PlanetLab extensions
Monitoring component

18. Future Works (2) IPv6 networks Share objects through the use of DHT
Control information
Destination list
Probing output

19. Conclusion Doubletree implementation in Java traceroute@home
Open-source, BSD-like license, freely available
Easily extensible
PlanetLab
Deployment
Evaluation