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September 07, 2017 9:58PM

The Story of Two Outages

Network BGP Outage Hurricane

Over the last two days, Cloudflare observed two events that had effects on global Internet traffic levels. Cloudflare handles approximately 10% of all Internet requests, so we have significant visibility into traffic from countries and networks across the world....

February 04, 2015 2:16PM

Path MTU discovery in practice


Last week, a very small number of our users who are using IP tunnels (primarily tunneling IPv6 over IPv4) were unable to access our services because a networking change broke "path MTU discovery" on our servers....

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November 29, 2012 8:13PM

How Syria Turned Off the Internet

Today, 29 November 2012, between 1026 and 1028 (UTC), all traffic from Syria to the rest of the Internet stopped. At CloudFlare, we witnessed the drop off. We've spent the morning studying the situation to understand what happened....

Network BGP Outage Syria

May 02, 2012 9:41PM

Today's Outage Post Mortem

CloudFlare had an outage across much of our network today. The outage began at 20:19 (GMT). It affected approximately 75% of traffic to CloudFlare's network. The length of time for the outage varied depending on region, but the maximum period of downtime was approximately 15 minutes....