Authors

Stéphane Bortzmeyer

Based in Paris (France)

13

Articles

40

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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.

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

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

4 min read

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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How Many RIPE Atlas Probes Believe They Have IPv6 (But Are Wrong)?

How Many RIPE Atlas Probes Believe They Have IPv6 (But Are Wrong)?

4 min read

To check the connectivity of an IPv6 device with RIPE Atlas, one typically asks N probes to ping the target and deduces the reachability of the target from the percentage of failures. But RIPE Atlas probes, like many IPv6 devices, often believe they are IPv6-connected while they are not.

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12
Using RIPE Atlas User Defined Measurements to Find the Most Popular Instances of a DNS Anycast Name Server

Using RIPE Atlas User Defined Measurements to Find the Most Popular Instances of a DNS Anycast Name Server

12 min read

A DNS anycast name server has several physical instances, all behind the same IP address. Which one is used by a RIPE Atlas probe depends on the location of the probe in the BGP space. RIPE Atlas can query the physical identity of the probe and therefore help to determine which instances have the l…

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