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Vasilis Giotsas

London, UK

October 29, 2025
One IP address, many users: detecting CGNAT to reduce collateral effects

IPv4 scarcity drives widespread use of Carrier-Grade Network Address Translation, a practice in ISPs and mobile networks that places many users behind each IP address, along with their collected activity and volumes of traffic. We introduce the method we’ve developed to detect large-scale IP sharing globally and mitigate the issues that result.

Vasilis Giotsas and Marwan Fayed

October 28, 2025
A framework for measuring Internet resilience

We present a data-driven framework to quantify cross-layer Internet resilience. We also share a list of measurements with which to quantify facets of Internet resilience for geographical areas.

Vasilis Giotsas,Cefan Daniel Rubin, and Marwan Fayed

December 16, 2022
Helping build a safer Internet by measuring BGP RPKI Route Origin Validation

Is BGP safe yet? If the question needs asking, then it isn't. But how far the Internet is from this goal is what we set out to answer.

Carlos Rodrigues and Vasilis Giotsas

November 23, 2022
How we detect route leaks and our new Cloudflare Radar route leak service

In this blog post, we will introduce our new system designed to detect route leaks and its integration on Cloudflare Radar and its public API.

Mingwei Zhang,Vasilis Giotsas, and Celso Martinho

October 15, 2021
“Look, Ma, no probes!” — Characterizing CDNs’ latencies with passive measurement

In this article we describe an alternative approach to active measurements, which accurately predicts network latencies using only passively collected data.

Vasilis Giotsas and Marwan Fayed

September 16, 2021
Unboxing the Last Mile: Introducing Last Mile Insights

“The last 20% of the work requires 80% of the effort.” The Pareto Principle applies in many domains — nowhere more so on the Internet, however, than on the Last Mile.

David Tuber and Vasilis Giotsas

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