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One can also see the effect by looking at the RTTs for affected hosts as a function of time. This is seen below where we plot the daily RTT seen from SLAC versus the date and the Top Level Domain (TLD) of the country the host is located in. It is seen taht there is a big spike going from around 300 ms to over 1000 ms for January 30th, followed by recovery in several cases. The main countries affected are the United Arab Emirates (AE), Bahrain (BH), Bangladesh (BD), Bhutan (BT), Djibouti (DJ), India (IN), Indonesia (ID), Jordan (JO), Sri Lanka (LK), the Maldives (MV), Oman (OM), Qatar(QA), Palestine(PS), Saudia Arabia (SA), Sudan (SD), and Thailand (TH).
To better illustrate the recovery for these 23 hosts in 13 countries, in the Figure below we show the median RTT seen from SLAC to these hosts for the last week in January. It is seen that the median RTT goes from a very stable ~300ms to almost 1000ms (a factor of more than 3) on January 30th. It partially recovers on January 31st to about 550 ms. The error bars show the variability of the results (as the Inter Quartile Range), which is seen to increase dramatically after January 29th.
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