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Stéphane Bortzmeyer

29 Apr, 2013 04:57 PM
All IP Addresses Are Equal? "dot-zero" Addresses Are Less Equal by Stéphane Bortzmeyer — last modified 24 Oct, 2018 10:29 AM

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.

The Many Instances of the L-root Name Server by Stéphane Bortzmeyer — last modified 17 Oct, 2016 08:58 AM

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.

How Many RIPE Atlas Probes Can Resolve IPv6-only Domain Names? by Stéphane Bortzmeyer — last modified 19 May, 2017 10:32 AM

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?

Orange Blacklisting: A Case for Measuring Censorship by Stéphane Bortzmeyer — last modified 08 Aug, 2017 02:04 PM

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 block list.