Mike Dano provides an interesting analysis of the deployment and performance of satellite based Internet access networks (mainly Starlink) based on Speedtest measurements.

Bruce Davie discusses the potential impact of improved shortest path computation algorithms on link state routing protocols such as OSPF and IS-IS.

Ivan Pepeljnak provides interesting information about the performance of routers thirty years ago and how they shaped some of the design of MPLS.

Since the early days of the Internet, telnet has been a very popular method to access remote servers. It has been slowly replaced by ssh since the late 1990s. Recently, a severe flaw has been identified in one of the most popular implementations of telnet that is deployed on a wide range of embedded devices. A recent study shows that multiple ISPs have started to block TCP on port 23 to prevent exploitation of this vulnerability.

An interesting NANOG presentation describes the BGP architecture of the Netflix network.

The BGP clock is an interesting experiment that allows detection of BGP zombies on the Internet. A BGP zombie is an IP prefix that has been withdrawn but whose route is still present in some routers.

Geoff Huston provides his annual review of the evolution of the global BGP routing tables.

A free IP geolocation database is available from https://ip66.dev/.

Arelion, aka AS1299, one of the international Tier-1 ISPs, provides an interesting graph on the evolution of the traffic that it carries.

Mike Nottingham wrote an interesting opinion explaining why the Internet is and should remain an open system.

Internet exchange Points (IXP) are a key component of the Internet as they allow ISPs to peer at different locations. Tommaso Caiazzi shows how to build a digital twin to reproduce such an IXP using Kathara.

The BBR congestion control algorithm is replacing the CUBIC algorithm in some TCP implementations. A recent survey (36 pages!) summarizes the literature on this congestion control scheme and provides some measurement results.

Mingwei Zhang and Bryton Herdes provide a nice description of the Autonomous System Provide Authorization (ASPA) that extends the RPKI to secure interdomain routing.

Some git repositories are being overloaded by companies that create thousands of git pulls per day due to misconfiguration or bad practices.

This blog aims at encouraging students who read the open Computer Networking: Principles, Protocols and Practice ebook to explore new networking topics. You can follow this blog by subscribing to its RSS feed or by following @cnp3_ebook on mastodon. Feel free to share the posts that you find interesting on your preferred social network.