Versions Compared

Old Version 21

changes.mady.by.user Les Cottrell

Saved on

compared with

New Version 22

changes.mady.by.user Les Cottrell

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.
Table of Contents

Introduction

Based on incidents such as those reported in https://www.ft.com/content/24b8b7b2-9272-11e9-aea1-2b1d33ac3271, there is interest in spotting the occurrence and impact of large Internet outages such as may be occasioned by civil unrest etc. To spot the shutdown of a country automatically would take a bit of mining. For example, the country should have 2 or more target hosts and if all the targets in a country go offline (not reachable) in the same time frame then that is an indicator that something is probably happening and worth investigating. Of course, that assumes the Measurement Agent (SLAC) also was not down (due to maintenance etc.) at the same time. One can tell from say https://www-iepm.slac.stanford.edu/pinger/sites-per-country.html how many targets there are by country.

...

Below is shown the daily packet loss (a dot means no pings were responded to) measured by sending up to 30 packets every 30 minutes.

Mauritania June

...

2019

According to https://twitter.com/InternetIntel there was a significant Internet disruption starting 15:30 UTC June 25th following controversy surrounding presidential elections hover the past weekend. Below is the daily packet loss or of three hosts in Mauritania measured by pinging them rpm SLAC.

...

Looking in more detail at the PingER Beacon host MR.NIC.N2 (AKA www.nic.mr) we see:

Image Modified

...

Syria June 2019

According to https://twitter.com/InternetIntel reporting on June 23 "Another 4.5 hour Internet blackout in Syria beginning at 01:00 UTC (4-8:30am local) for another student exam. 6th such outage this month. Next exam (& internet blackout) to occur in two days." This is seen in the plot below of the Syrian PingER Beacon host www.iust.edu.sy.

...