How we built rate limiting capable of scaling to millions of domains

Published on by Julien Desgats.

Back in April we announced Rate Limiting of requests for every Cloudflare customer. Being able to rate limit at the edge of the network has many advantages: it’s easier for customers to set up and operate, their origin servers are not bothered by excessive traffic or layer 7 attacks,

Not one, not two, but three undersea cables cut in Jersey

Published on by Martin J Levy.

Sometime before midnight Monday (UK local time) a ship dropped its anchor and broke, not one, not two, but three undersea cables serving the island of Jersey in the English Channel. Jersey is part of the Channel Islands along with Guernsey and some smaller islands. Image courtesy TeleGeography Submarine Cable

The Cuban CDN

Published on by John Graham-Cumming.

On a recent trip to Cuba I brought with me a smartphone and hoped to get Internet access either via WiFi or 3G. I managed that (at a price) but also saw for myself how Cubans get access to an alternate Internet delivered by sneakernet. Cuba is currently poorly served

Today's Network Issue

Published on by Matthew Prince.

Today at 16:13 UTC a large amount of traffic began hitting our Los Angeles data center. We have an in-house team that monitors our network 24x7x365 and immediately all their alarms went off. We initially thought it was a very large attack. In fact, it was something much trickier

Today's System-Wide Upgrade

Published on by Matthew Prince.

Today from 21:00 - 23:00 UTC CloudFlare scheduled a maintenance window. During that time, CloudFlare's interface was offline. While it was only two hours of time (and we finished a bit early, at 22:16 UTC) what went on during that window had been in the

How Syria Turned Off the Internet

Published on by Matthew Prince.

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. The following graph shows the last several days of traffic