{"id":175,"date":"2011-05-23T09:43:00","date_gmt":"2011-05-23T16:43:00","guid":{"rendered":"http:\/\/ant.isi.edu\/blog\/?p=175"},"modified":"2020-10-19T10:29:45","modified_gmt":"2020-10-19T17:29:45","slug":"new-tech-report-detecting-internet-outages-with-active-probing","status":"publish","type":"post","link":"https:\/\/ant.isi.edu\/blog\/?p=175","title":{"rendered":"New tech report \u201cDetecting Internet Outages with Active Probing\u201d"},"content":{"rendered":"<p>We just published a new technical report &#8220;Detecting Internet Outages with Active Probing&#8221;, available at\u00a0<a href=\"ftp:\/\/ftp.isi.edu\/isi-pubs\/tr-672.pdf\">ftp:\/\/ftp.isi.edu\/isi-pubs\/tr-672.pdf<\/a>.<\/p>\n<p>From the abstract:<\/p>\n<blockquote><p>With businesses, governments, and individuals increasingly<br \/>\ndependent on the Internet, understanding its reliability is more<br \/>\nimportant than ever. Network outages vary in scope and<br \/>\ncause, from the intentional shutdown of the Egyptian Inter-<br \/>\nnet in February 2011, to outages caused by the effects of<br \/>\nMarch 2011 earthquakes on undersea cables entering Japan,<br \/>\nto the thousands of small, daily outages caused by localized<br \/>\naccidents or human error. In this paper we present a new<br \/>\nmethod to detect network outages by probing entire blocks.<br \/>\nUsing 24 datasets, each a 2-week study of 22,000 \/24 address<br \/>\nblocks randomly sampled from the Internet, we develop new<br \/>\nalgorithms to identify and visualize outages and to cluster<br \/>\nthose outages into network-level events. We validate our ap-<br \/>\nproach by comparing our data-plane results against control-<br \/>\nplane observations from BGP routing and news reports, ex-<br \/>\namining both major and randomly selected events. We con-<br \/>\nfirm our results are stable from two different locations and<br \/>\nover more than one and half years of observations. We show<br \/>\nthat our approach of probing all addresses in a \/24 block is<br \/>\nsignificantly more accurate than prior approaches that use a<br \/>\nsingle representative for all routed blocks, cutting the num-<br \/>\nber of mistake outage observations from 44% to under 1%.<br \/>\nWe use our approach to study several large outages such as<br \/>\nthose mentioned above. We also develop a general estimate<br \/>\nfor how much of the Internet is regularly down, finding about<br \/>\n0.3% of the Internet is likely to be unreachable at any time.<br \/>\nBy providing a baseline estimate of Internet outages, our<br \/>\nwork lays the groundwork to evaluate ISP reliability.<\/p><\/blockquote>\n<p>Citation: Lin Quan and John Heidemann. Detecting Internet Outages with Active Probing. Technical Report N. ISI-TR-672. USC\/Information Sciences Institute, May 2011. http:\/\/ftp:\/\/ftp.isi.edu\/isi-pubs\/tr-672.pdf<\/p>\n","protected":false},"excerpt":{"rendered":"<p>We just published a new technical report &#8220;Detecting Internet Outages with Active Probing&#8221;, available at\u00a0ftp:\/\/ftp.isi.edu\/isi-pubs\/tr-672.pdf. From the abstract: With businesses, governments, and individuals increasingly dependent on the Internet, understanding its reliability is more important than ever. Network outages vary in scope and cause, from the intentional shutdown of the Egyptian Inter- net in February 2011, [&hellip;]<\/p>\n","protected":false},"author":36,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[282,283],"tags":[32,8,22,44,5,41,45,26,36],"class_list":["post-175","post","type-post","status-publish","format-standard","hentry","category-publications","category-technical-report","tag-internet-topology","tag-lander","tag-measurement-systems","tag-outage-detection","tag-papers","tag-predict","tag-reliability","tag-tech-report","tag-visualization"],"_links":{"self":[{"href":"https:\/\/ant.isi.edu\/blog\/index.php?rest_route=\/wp\/v2\/posts\/175","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ant.isi.edu\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ant.isi.edu\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ant.isi.edu\/blog\/index.php?rest_route=\/wp\/v2\/users\/36"}],"replies":[{"embeddable":true,"href":"https:\/\/ant.isi.edu\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=175"}],"version-history":[{"count":4,"href":"https:\/\/ant.isi.edu\/blog\/index.php?rest_route=\/wp\/v2\/posts\/175\/revisions"}],"predecessor-version":[{"id":201,"href":"https:\/\/ant.isi.edu\/blog\/index.php?rest_route=\/wp\/v2\/posts\/175\/revisions\/201"}],"wp:attachment":[{"href":"https:\/\/ant.isi.edu\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=175"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ant.isi.edu\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=175"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ant.isi.edu\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=175"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}