Some of the third version of RIPE Atlas probes have recently had an issue with their USB sticks. We're investigating what may be causing this issue and have a possible solution, outlined below. (At the same time, we're also looking into a new hardware solution for the future.) If you've had trouble with your probe, please follow these simple steps. RIPE Atlas users everywhere will thank you for getting your probe back online - and we will, too!
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
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.
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.