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Mapping and Visualizing the Internet
Bill Cheswick, Hal Burch, and Steve Branigan
Proceedings of 2000 USENIX Annual Technical Conference
元智資工所 系統實驗室 楊錫謦
2000/7/26
Outline
• Introduction
• Mapping
• Layout
• Future Work & Conclusion
Introduction
 By discovering the path to all announced network
on an Internet, we can build a good picture of the
center of the Internet.
 Large intranets are hard to manage and offer
many security problems.
 They discovered that mapping is a more useful
pursuit for an intranet.
Introduction(Cont.)
 The daily scanning of their mapping software
allows us to detect log-term routing and connectivity
changes on the Internet.
 Motivation - A map might be useful to know how
connectivity changes before and during an attack on
the Internet infrastructure.
Mapping
 Their tracing data consists of paths from a test
host towards a single host on a destination network.
 This technique only records an outgoing packet
path – the incoming path is often different.
 Mapping, Not Hacking
Layout
 They model the graph as a physical system.
 The standard model employed is spring attraction
and electrical repulsion.
 A trick to more quickly compute a layout –
replacing the electrical repulsive field with spring
repulsion.
 The real optimization is laying out the graph one
layer at a time.
Future Work
 Scanning from multiple host – a more accurate
map.
 volunteers to run their mapping
 IP tunneling
 better visualization tool
Conclusion
 The mapping technology can reveal insights about
large networks.
 The Internet maps have certainly excited the
media.
 data collection