For a while now, the number of active RIPE Atlas probes has hovered around the 9,400 mark. This means that new probes are being connected at a fast enough rate to replace failing probes, but not enough to grow the network. At the same time, the version 3 probes have problems with their USB sticks. This led us to wonder whether these two issues are related.
Philip Homburg currently works on the measurement code and other firmware that runs on the RIPE Atlas probes and anchors. He received a PhD degree in computer science from the VU University, Amsterdam. During his PhD studies he designed a wide-area distributed system called Globe. He also worked on the security of mobile phones in the EU FP7 project WOMBAT, MINIX3 (device driver crash recovery), and an advanced disk abstraction layer in the Logical Disk project.
Pages created by Philip Homburg
This article describes how RIPE Atlas probes and anchors maintain their clocks, and how accurate these clocks are. We also plan to make the NTP measurements we describe here available as an additional measurement type for RIPE Atlas users.
We've decided to release the RIPE Atlas measurement source code for the first time.