CloudTrace Project Overview

The CloudTrace project investigates how cloud networks interconnect and interact with the public Internet. We do this using by probing every routed /24 IPv4 subnet. This probing uses a mix of ICMP Echo Requests, UDP and TCP Syn probes to gather the data necessary to interpret the Internet topology. UDP and TCP probes used destination port 30000.

Opt Out

We probe every /24 once every 11 hours, but a target might receive up to 32 probe packets in a short period of time. To opt out, send an email to cloudtrace@caida.org specifying the address space we should avoid.

Acknowledgment of awarding agency’s support

Support for the Cloudtrace project is provided by the Defense Advanced Research Projects Agency (DARPA) cooperative agreement HR00112020014 Performance Evaluation Network Measurements and Analytics and the National Science Foundation (NSF) grants CNS-1901517 Strategies for Large-Scale IPv6 Active Mapping and OAC-1724853 Integrated Platform for Applied Network Data Analysis. The U.S. Government is authorized to reproduce and distribute reprints for Governmental purposes notwithstanding any copyright notation thereon. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of DARPA, NSF, or the U.S. Government.