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Daniel Karrenberg

RIPE NCC Staff — 10 Jul, 2010 04:25 PM
25 Years of the RIPE NCC – The First Hours by Daniel Karrenberg — last modified 16 May, 2017 10:01 AM

March 1992 - NIKHEF Amsterdam - Main Computer Room: "We have connectivity!" Marten called out. "Running the check script." Daniel responded. The two young engineers were intently looking at their screens, totally oblivious to anything around them: the noise of the air-conditioning fans, the blinking lights of communications equipment and the whining of the high-speed disk drives.

There is Gold in this Stream - Sifting Through Used RIPE Atlas Traceroute Results by Daniel Karrenberg — last modified 30 Nov, 2016 09:15 PM

This work demonstrates the value of the results collected by RIPE Atlas independent of the original purpose for collecting them. Using all traceroute results from a particular day as an example, we first show that near real-time analysis of the result stream is feasible. Then we show that this has great potential for studying the packet layer of the Internet in general and for providing tools to network operators in particular. All this suggests a large and diverse potential for further work.

RIPE Atlas Fun: Map a RIPE Atlas Anchor by Daniel Karrenberg — last modified 17 Oct, 2016 08:54 AM

View maps based on RIPE Atlas traceroute measurements. Compare the maps to the ISP's description of their topology. See the potential of RIPE Atlas for mapping the packet layer topology. Learn about experimental tools you can use yourself to explore. Make suggestions for further work.

Conclusions Drawn from Reverse DNS Event by Daniel Karrenberg — last modified 20 Jul, 2017 02:37 PM

On Wednesday 13 June 2012, an unknown error caused the removal of several zone files from the configuration of our reverse DNS provisioning system. Following up from the initial report published on RIPE Labs, we further analysed what caused the incident and implemented a number of procedures to decrease the likelihood of this happening in the future.

Root Servers in Member Networks by Daniel Karrenberg — last modified 30 Nov, 2016 09:29 PM

In addition to the existing global and local instances of K-root, we propose member instances of K-root. This article describes the benefits and how this will be implemented during the pilot phase.

Timeline of Reverse DNS Events by Daniel Karrenberg — last modified 01 Dec, 2016 12:00 AM

Last week there were several problems with the RIPE NCC's reverse DNS (rDNS) service. This article is a first report about the events. It is not intended to analyse the causes or make detailed recommendations for action.

IPv4: Business As Usual by Daniel Karrenberg — last modified 17 Oct, 2016 08:59 AM

In anticipation of reaching the last /8 of IPv4 addresses in the RIPE NCC service region, we have been looking at the number of IPv4 addresses the RIPE NCC handed out over the last four years. The curves look surprisingly uniform.

RIPE Atlas & Anycast Instance Switches by Daniel Karrenberg — last modified 17 Oct, 2016 08:59 AM

RIPE Atlas can now test packet flows from more than 1000 vantage points on the Internet. We took a quick look at anycast traffic to DNS root name servers. There is a lot of interesting signal in this data.

Addresses for RIPE RIS Beacons in Jeopardy by Daniel Karrenberg — last modified 30 Nov, 2016 11:34 PM

According to address policy, the experimental address allocations for RIPE RIS beacons have to be returned soon. This would mean we have to either discontinue the RIS beacons or request permanent allocations for them according to address policy. We are asking for community support to continue operating the RIS beacons at the current addresses and for support for the address allocations.

RIPE TTM User Survey Results by Daniel Karrenberg — last modified 17 Oct, 2016 08:55 AM

As part of our effort to make an evolution plan for the RIPE Test Traffic Measurement service, we conducted a survey among TTM hosts. Find below the results and suggested next steps.

RIPEstat: The RIPE NCC Information Toolbox by Daniel Karrenberg — last modified 17 Oct, 2016 09:00 AM

The RIPE NCC is working on a toolbox, called RIPEstat, that will make it easier to access the various datasets maintained by the RIPE NCC. This toolbox will be developed in close cooperation with the community. There will be public demo sessions as described in this article.

RIPE Atlas Now on Five Continents by Daniel Karrenberg — last modified 15 Nov, 2017 10:48 AM

RIPE Atlas probes are now active on five continents. After the big run on the measurement probes during the recent RIPE Meeting, the deployment is a little slower than expected; but there is a steady stream of probes coming online. We expect to make our initial goal of 300 active probes well before the end of 2010. Probe hosts can win an iPad by keeping their probes up during December.