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Stéphane Bortzmeyer

Location: Paris (France)

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

Pages created by Stéphane Bortzmeyer

All IP Addresses Are Equal? "dot-zero" Addresses Are Less Equal
Stéphane Bortzmeyer — 03 Jul 2013

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. This is the case for the "dot-zero", IPv4 addresses in which the last byte is zero.… Read more

Tags: atlas ipv4
Using RIPE Atlas User Defined Measurements to Find the Most Popular Instances of a DNS Anycast Name Server
Stéphane Bortzmeyer — 03 May 2013

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 largest user base.… Read more

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