Philip Homburg




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About the author

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.

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What’s the Deal with IPv6 Link-Local Addresses?

...or, how RIPE Atlas measurement data just got a little bit more complex. Some people say IPv6 is "96 more bits, no magic". And while this is true for most network operators, if you're a RIPE Atlas system programmer, you can run into interesting situations. In this article, we described how link-l…

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Further Analysis of RIPE Atlas Version 3 Probes

We continue to look at failure rates for RIPE Atlas version 3 probes and the possible causes.

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Troubleshooting RIPE Atlas Probes: USB Sticks

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…

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A Visual Impression of Probe Lifetimes

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. …

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NTP Measurements with RIPE Atlas

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.

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Releasing RIPE Atlas Measurements Source Code

We've decided to release the RIPE Atlas measurement source code for the first time.

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