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We have data from PingER going back to 2005 which I have mined to look for DUP's. The input data is one line per set of pings made from SLAC to a remote host. The line indicates whether there were DUP’s. Each line is for a remote host monitored from SLAC with up to 10 successful (with a cut off at 30 tries) 100 Byte pings each 30 mins.
We wrote a perl script (dupes.pl) to analyze the data.
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The current number of countries with remote hosts being monitored is 171.
The major contributor since 2006 has been www.cern.ch, each year we see about 60 different hosts responding with DUPs.
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Year | DUPs | Hosts DUPing | Hosts monitored | Samples | % | CERN | Diff | % CERN |
2005 | 93 | 27 | 481 | 11408092 | 0.0008% | 0 | 93 | 0.00% |
2006 | 9228 | 40 | 514 | 13715929 | 0.0673% | 5751 | 3477 | 62.32% |
2007 | 35673 | 42 | 541 | 16315320 | 0.2186% | 34721 | 952 | 97.33% |
2008 | 39262 | 57 | 592 | 19680482 | 0.1995% | 34249 | 5013 | 87.23% |
2009 | 42356 | 52 | 663 | 17889767 | 0.2368% | 27469 | 14887 | 64.85% |
2010 | 74638 | 51 | 623 | 19862304 | 0.3758% | 19693 | 54945 | 26.38% |
2011 | 30769 | 79 | 659 | 22889278 | 0.1344% | 22518 | 8251 | 73.18% |
2012 | 85217 | 50 | 797 | 23786399 | 0.3583% | 34402 | 50815 | 40.37% |
2013 | 74128 | 76 | 774 | 25475771 | 0.2910% | 34916 | 39212 | 47.10% |
2014 | 16990 | 41 | 836 | 29933696 | 0.0568% | 14026 | 2964 | 82.55% |
2015 | 164 | 4 | 514773 | 0.0319% | 104 | 60 | 63.41% |
Distribution of Remote (monitored) hosts by country