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The Story of Two Outages

Published on by Louis Poinsignon.

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. On Tuesday, September 5th, the government of Togo decided to restrict

NANOG - the art of running a network and discussing common operational issues

Published on by Martin J Levy.

The North American Network Operators Group (NANOG) is the loci of modern Internet innovation and the day-to-day cumulative network-operational knowledge of thousands and thousands of network engineers. NANOG itself is a non-profit membership organization; but you don’t need to be a member in order to attend the conference or

Path MTU discovery in practice

Published on by Marek Majkowski.

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. In this article, I'll explain what path MTU discovery is, how we