Based in Tokyo
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I am senior researcher at IIJ Research Lab. The focus of my work is on Internet measurements, traffic analysis and network security.
• 7 min read
The Internet Health Report (IHR) is an open source project, partly funded by RIPE NCC Community Projects Fund, that monitors AS connectivity. This article is a quick introduction to IHR and shares some good examples of IHR monitoring capabilities. Interested? Take a look at our website (https://ihr…
• 3 min read
As part of the Internet health hackathon, we studied RIPE Atlas delay signals before and during the COVID-19 pandemic. Here's what we found.
• 8 min read
When withdrawing an IP prefix from the Internet, an origin network sends BGP withdraw messages, which are expected to propagate to all BGP routers that hold an entry for that IP prefix in their routing table. Yet network operators occasionally report issues where routers maintain routes to IP prefi…
• 5 min read
How does your network depend on other networks? In this article we present a new tool that helps you measure AS dependencies.
• 8 min read
Detecting network disruptions is a recurring problem. Clearly locating performance degradation is an important step in debugging and subsequently fixing connectivity issues.
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• 6 min read
In this article, Mohamed presents his Google Summer of Code project that correlates and aggregates alarm data to detect real-world Internet outages. His project integrates data from IHR, GRIP, and IODA, visualising BGP hijacking, delays, and outages for improved real-time monitoring.
• 11 min read
This article presents a set of open-source tools - “reusable visualisations” - that extend the AS hegemony visualisations provided by the Internet Health Report. Users can directly use the online tools or embed the IHR data on their own posts, webpages, or Observable HQ notebooks.
• 11 min read
Speculation about Russia disconnecting or being disconnected from the wider Internet abounds. In this article, we look at the connectivity of the Russian Internet to the wider Internet and how this evolved around the Russian invasion into Ukraine and sanctions related around that.
• 7 min read
This post describes a technique to detect bursty TCP disconnections, and how it can be used on RIPE Atlas data to better detect outages in the Internet.
• 9 min read
BGP routing table growth is one of the major Internet scaling issues, and prefix deaggregation is thought to be a major contributor to table growth. In this work we quantify the fragmentation of the routing table by the type of IP prefix. We observe that the proportion of deaggregated prefixes has …
Showing 5 article(s)
Hi Juraj, thanks, I added Slovakia: https://ihr.iijlab.net/ihr/en-us/covid19?country=Slovakia
“How do we get additional eyeball networks added for a country? The dashboard is great! Lots of people asking for this kind of data, so it really shows off what kind be done with the RIPE Atlas data.”
Hi Matt, The RTT/COVID dashboard only shows the top eyeball networks in a country, but if you are interested in a particular network you can type its name or ASN in the top left search field. It will bring you to page with all the metrics we have for that network. If really you want to add more networks to the dashboard, then I could change it :)
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