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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

DNS Censorship (DNS Lies) As Seen By RIPE Atlas
DNS Censorship (DNS Lies) As Seen By RIPE Atlas
Stéphane Bortzmeyer — Dec 11, 2015 12:20 PM

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?

Checking your Internet Connectivity with RIPE Atlas Anchors
Checking your Internet Connectivity with RIPE Atlas Anchors
Stéphane Bortzmeyer — Sep 14, 2015 05:05 PM

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.

The Many Instances of the L-root Name Server
The Many Instances of the L-root Name Server
Stéphane Bortzmeyer — Jan 20, 2014 04:50 PM

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?
Stéphane Bortzmeyer — Jan 13, 2014 09:05 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?

All IP Addresses Are Equal? "dot-zero" Addresses Are Less Equal
Stéphane Bortzmeyer — Jul 03, 2013 11:00 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.

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