1. Measuring the Measurers: How is Atlas Used?
Cristel Pelsser
Emile Aben
Laurent Vanbever
Randy Bush
Romain Fontugne
Thomas Holterbach
Atlas Meta
Creative Commons: Attribution & Share Alike

2. Creative Commons: Attribution & Share Alike
Agenda
What Tools are Popular?
What Measurements are Made?
The Major User Classes
Built-Ins (DNS Roots, Anchors) – One ’Measurement’
System users (DNSmon etc.)
Privileged Users (Long Running RIPE Experiments)
Normal Users (Operators & Researchers)
Ops and Researchers
No Personal Data were Used or Published
Atlas Meta
Creative Commons: Attribution & Share Alike

3. Creative Commons: Attribution & Share Alike
What Tools
are Popular?
Atlas Meta
Creative Commons: Attribution & Share Alike

4. Creative Commons: Attribution & Share Alike
Atlas Meta
Creative Commons: Attribution & Share Alike

5. Creative Commons: Attribution & Share Alike
How Many
Users Used
Each Tool?
Atlas Meta
Creative Commons: Attribution & Share Alike

6. Creative Commons: Attribution & Share Alike
Remember, Built-ins
are Counted as One User
Atlas Meta
Creative Commons: Attribution & Share Alike

7. Creative Commons: Attribution & Share Alike
How Many Pings
and Traceroutes?
Atlas Meta
Creative Commons: Attribution & Share Alike

8. Creative Commons: Attribution & Share Alike
Built-ins
Dominate
Atlas Meta
Creative Commons: Attribution & Share Alike

9. Creative Commons: Attribution & Share Alike
System Users
Dominate
Atlas Meta
Creative Commons: Attribution & Share Alike

10. Creative Commons: Attribution & Share Alike
Can We Tell
Ops from
Researchers?
Atlas Meta
Creative Commons: Attribution & Share Alike

11. Creative Commons: Attribution & Share Alike
Shooters & Sprayers
shooters, who predominantly source measurements from, or perform measurements to, a single AS (ops?) sprayers, where the sources and destinations of measurements are more diverse (researchers?)
Atlas Meta
Creative Commons: Attribution & Share Alike

12. Creative Commons: Attribution & Share Alike
shooters
sprayers
Atlas Meta
Creative Commons: Attribution & Share Alike

13. Creative Commons: Attribution & Share Alike
We Also Looked at
Probe Diversity,
Geographic and
Topological
Atlas Meta
Creative Commons: Attribution & Share Alike

14. Creative Commons: Attribution & Share Alike
We Also Looked at
Measurement
Diversity,
Geographic and
Topological
Atlas Meta
Creative Commons: Attribution & Share Alike

15. so not yet distributable) https://archive.psg.com/
And it is All in Our
Lovely Paper
(in submission to IMC
so not yet distributable)
imc-atlas-meta.pdf
Atlas Meta
Creative Commons: Attribution & Share Alike

16. What Can We Do Using Only the Built-In & Anchor Traceroutes?

17. Challenge: Traffic is asymetric
The differential RTT ≠ delay of link B-C
but …
Atlas Hackathon
Creative Commons: Attribution & Share Alike

18. Delays along non-common paths are independent
this delay
is independent of this delay
Atlas Hackathon
Creative Commons: Attribution & Share Alike

19. The central theorem tells us that with enough samples we have a normal distribution
Figure from wikipedia: By Chen-Pan Liao - Own work, CC BY-SA 4.0,
We only keep links that are observed from a significant number of ASs
Atlas Hackathon
Creative Commons: Attribution & Share Alike

20. Detection of RTT changes
Example: DDoS attacks against DNS root servers
Reference Interval
Atlas Hackathon
Creative Commons: Attribution & Share Alike

21. We Have a Similar Technique to Detect Forwarding Changes & Drops
Atlas Meta
Creative Commons: Attribution & Share Alike

22. Telekom Malaysia BGP route leak
Atlas Hackathon
Creative Commons: Attribution & Share Alike

23. But Why Did We Look at That?
Per-AS Alarm!
For Delay
Atlas Hackathon
Creative Commons: Attribution & Share Alike

24. Creative Commons: Attribution & Share Alike
And Forwarding Too!
Per-AS Alarm!
For Forwarding
Atlas Hackathon
Creative Commons: Attribution & Share Alike

25. Creative Commons: Attribution & Share Alike
Congestion: Red nodes depict IP addresses detected by forwarding anomalies
Malaysia 10,200km this way
Atlas Hackathon
Creative Commons: Attribution & Share Alike

26. Creative Commons: Attribution & Share Alike
See!
Research Can Be
Operationally
Useful!
Atlas Meta
Creative Commons: Attribution & Share Alike