Leap second causes Internet hiccup, particularly in Brazil

More than 2,000 networks crashed, but most recovered quickly, according to Dyn

The leap second added to clocks at midnight Wednesday caused more than 2,000 networks to briefly crash.

The leap second added to clocks at midnight Wednesday caused more than 2,000 networks to briefly crash.

The addition of a leap second to world clocks on Wednesday caused some networks to crash although most quickly recovered.

Some 2,000 networks stopped working just after midnight Coordinated Universal Time (UTC), said Doug Madory, director of Internet analysis with Dyn, a company studies global Internet traffic flows.

Nearly 50 percent of those networks were in Brazil, which may indicate that ISPs use a common type of router that may not have been prepared for the leap second, he said.

Most of the networks quickly recovered, which may have required just a reboot of a router, Madory said.

The Internet's global routing table, a distributed database of networks and how they connect, contains more than 500,000 networks, so the problems affected less than a half a percent, Madory said.

Just after midnight, the number of changes to the global routing table spiked to as much as 800,000 per 30 seconds, according to Dyn. Changes to connections between networks are announced by providers using BGP (Border Gateway Protocol) and propagate across the Internet to other providers.

Madory said it's not unheard of to see a flurry of new BGP announcements around those levels, but the timing around the leap second and 2,000 networks going offline "can't be a coincidence."

A leap second is added every few years to keep UTC synched with solar time. The difference between the two widens due to the slowing of the earth's rotation. Since 1971, 26 leap seconds have been added to clocks.

Most Internet-connected computers use the Network Time Protocol (NTP) to keep track of time, which is linked to UTC.

The last leap second, added in 2012, caused problems for Linux systems such as slowdowns or CPU freezes. This time around, however, many companies looked to avoid issues with better preparation.

Send news tips and comments to jeremy_kirk@idg.com. Follow me on Twitter: @jeremy_kirk

Join the Good Gear Guide newsletter!

Error: Please check your email address.

Tags Dyninternet

Our Back to Business guide highlights the best products for you to boost your productivity at home, on the road, at the office, or in the classroom.

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Jeremy Kirk

IDG News Service
Show Comments

Cool Tech

Crucial Ballistix Elite 32GB Kit (4 x 8GB) DDR4-3000 UDIMM

Learn more >

Gadgets & Things

Lexar® Professional 1000x microSDHC™/microSDXC™ UHS-II cards

Learn more >

Family Friendly

Lexar® JumpDrive® S57 USB 3.0 flash drive 

Learn more >

Stocking Stuffer

Plox Star Wars Death Star Levitating Bluetooth Speaker

Learn more >

Christmas Gift Guide

Click for more ›

Most Popular Reviews

Latest News Articles

Resources

GGG Evaluation Team

Kathy Cassidy

STYLISTIC Q702

First impression on unpacking the Q702 test unit was the solid feel and clean, minimalist styling.

Anthony Grifoni

STYLISTIC Q572

For work use, Microsoft Word and Excel programs pre-installed on the device are adequate for preparing short documents.

Steph Mundell

LIFEBOOK UH574

The Fujitsu LifeBook UH574 allowed for great mobility without being obnoxiously heavy or clunky. Its twelve hours of battery life did not disappoint.

Andrew Mitsi

STYLISTIC Q702

The screen was particularly good. It is bright and visible from most angles, however heat is an issue, particularly around the Windows button on the front, and on the back where the battery housing is located.

Simon Harriott

STYLISTIC Q702

My first impression after unboxing the Q702 is that it is a nice looking unit. Styling is somewhat minimalist but very effective. The tablet part, once detached, has a nice weight, and no buttons or switches are located in awkward or intrusive positions.

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?