Internet Infrastructure Review (IIR) Vol.51
June 2021

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• Executive Summary[461KB]
• Periodic Observation Report "FY2020's 200x Rise in Spam, and Tackling Password-protected ZIP Files"[557KB]

  A year has passed since the sudden rise of telework, from both home and satellite offices, as a means of dealing with COVID-19. While the world has been transformed over the past year, the importance of email for enterprises remains unchanged.
  In this article, we look back on events in the messaging space in 2020.

• Focused Research (1) "IIIJ's Further Challenges as a Full MVNO ? Road to commercial NSA/SA services through a unique path in local 5G environments"[978KB]

  In this report, IIJ's efforts in the area of 5G NSA (non-standalone) and SA (standalone).

• Focused Research (2) "Meet Barry, IIJ's Tool for Rapid Fault Resolution"[0.98MB]

  IIJ uses an internally developed operations system called Barry for troubleshooting.
  Here, I describe how Barry works and what it does.