Large Outage in Pakistan

October 26, 2011 Doug Madory
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For about 3.5 hours today, almost half of the Internet in Pakistan was down. Renesys observed 46% of the routed networks of Pakistan withdrawn from the global routing table between 19:37 and 23:02 UTC making this the largest Internet outage we have observed in the country in recent years.

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All 1253 networks involved in the outage were routed through Transworld Associates (AS38193), suggesting the outage was likely the result of a problem on the Transworld network serving Pakistan (TW1).

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At the time of this writing, these networks have been restored.

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About the Author

Doug Madory is a Director of Internet Analysis at Dyn where he works on Internet infrastructure analysis projects. Doug has a special interest in mapping the logical Internet to the physical lines that connect it together, with a special interest on submarine cables.

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