Authors

Stéphane Bortzmeyer

Based in Paris (France)

12

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About the author

I work at AFNIC (the registry of .fr domain names), in the R&D department, on, among other things, DNS, security, statistics.

Creating RIPE Atlas One-off Measurements with Blaeu

There are several ways to create RIPE Atlas measurements, thanks to its API. Here, we present Blaeu, a set of tools to create one-off measurements, mostly to debug temporary issues.

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3

Quad9, a Public DNS Resolver - with Security

Quad9 is a public DNS resolver, with promises of better privacy, and a DNS-over-TLS access.

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7

Processing RIPE Atlas Results with jq

A short tutorial on the use of the jq processor and programming language to analyse RIPE Atlas JSON files.

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4

Orange Blacklisting: A Case for Measuring Censorship

On 17 October 2016, a website hosted by the French Ministry of the Interior went offline when a large number of customers of the Internet service provider, Orange, were redirected to the site. The problem occurred after Google, Wikipedia and cloud provider OVH were mistakenly placed on a terrorism …

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1

Using RIPE Atlas to Debug Network Connectivity Problems

This article explains how I use RIPE Atlas probes, the official API and custom scripts to debug network issues.

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1

DNS Censorship (DNS Lies) As Seen By RIPE Atlas

More and more governments, authorities and courts are requesting censorship of Internet content. It is often done via a lying DNS resolver. Can we use RIPE Atlas probes to see it, and how?

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6

Checking your Internet Connectivity with RIPE Atlas Anchors

If you monitor your external Internet connectivity, you may wonder which machine is the best to ping. Hesitate no more - you can use RIPE Atlas anchors as landmarks.

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2

The Many Instances of the L-root Name Server

The techniques used by the L-root DNS server are documented in RFC 7108 "A Summary of Various Mechanisms Deployed at L-Root for the Identification of Anycast Nodes". These techniques can be used by the RIPE Atlas probes to find the instance of L-root they are talking to.

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3

How Many RIPE Atlas Probes Can Resolve IPv6-only Domain Names?

Each RIPE Atlas probe has at least one DNS resolver, indicated by a DHCP reply on the local network of the probe. Irrespective of the IP address of the resolver, this server may have IPv4 and IPv6 connectivity or only IPv4 connectivity. What is the percentage among RIPE Atlas probes?

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4

All IP Addresses Are Equal? "dot-zero" Addresses Are Less Equal

In theory, all IP addresses are the same, and you can allocate them at random without a problem. 192.168.1.2 is certainly not better or worse than 192.168.1.15, right? But, in practice, certain IP addresses are regarded as "special" by some implementations and do not yield the same user experience.…

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