Feeds

Last month's root-server attack revisited

Net safe thanks to technology called Anycast

Eight steps to building an HP BladeSystem

Last month's attack on at least six of the net's root servers was formidable, but thanks to the implementation of a technology designed to protect the infrastructure, only two were affected, according to a factsheet issued today by ICANN.

The DDoS attack flooded the servers with a stunning amount of data, as much as 1 Gbps at points, according to the oversight group. But damage was relatively contained thanks to new load-balancing technology called Anycast, which was installed on all the servers that came under fire, except for the two that sustained damage.

"Anycast allows a number of servers in different places to act as if they are in the same place," according to the document. "So while there remains 13 locations on the network for root serves, the reality on the ground is that not only are there often dozens at one spot but dozens of servers in other locations that can also deal with requests."

That allows the servers - which translate domain names such as theregister.com into IP numbers such as 72.3.246.59 - to distribute large volumes of data evenly among many machines (a many-hands-make-light-work approach, if you will). Anycast also safeguards against damage that could be caused by natural disasters by geographically dispersing servers.

The attack was, in fact, two forays, one that started at 4AM California time on Feb. 6 and lasted for two-and-a-half hours, and the other, a five-hour assault that started several hours after the first one stopped. That torrent of packets originated from hundreds of zombies, so it's impossible to know where in the world the attackers were located. Educated guesses lead engineers to believe they came from the Asia Pacific, possibly in Korea.

Of the two servers that sustained damage, one was the g-root, which is operated by US Department of Defense and is physically located in Ohio, and the other was the l-root, run by ICANN and based in California. ICANN attributed the damage they sustained to the absence of Anycast.

In addition to those two root servers, three others also are not using the technology. Engineers have held off installing it universally because some worried there could be risks associated with making different servers appear to be coming from the same place. "And so just a few root servers tried the system first, tested it thoroughly and ironed out any bugs before the next set moved over," the report explained. (Note: In previous versions of this story, we misread the report to say the delay was based on root servers using different OSes. This is not the case.)

After last month's episode, it's likely the remaining servers - which in addition to roots G and L also include roots D, E and H - will adopt the technology soon. ®

Bridging the IT gap between rising business demands and ageing tools

More from The Register

next story
Auntie remains MYSTIFIED by that weekend BBC iPlayer and website outage
Still doing 'forensics' on the caching layer – Beeb digi wonk
Apple orders huge MOUNTAIN of 80 MILLION 'Air' iPhone 6s
Bigger, harder trouser bulges foretold for fanbois
GoTenna: How does this 'magic' work?
An ideal product if you believe the Earth is flat
Telstra to KILL 2G network by end of 2016
GSM now stands for Grave-Seeking-Mobile network
Seeking LTE expert to insert small cells into BT customers' places
Is this the first step to a FON-a-like 4G network?
Yorkshire cops fail to grasp principle behind BT Fon Wi-Fi network
'Prevent people that are passing by to hook up to your network', pleads plod
BlackBerry: Toss the server, mate... BES is in the CLOUD now
BlackBerry Enterprise Services takes aim at SMEs - but there's a catch
prev story

Whitepapers

Top three mobile application threats
Prevent sensitive data leakage over insecure channels or stolen mobile devices.
Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Boost IT visibility and business value
How building a great service catalog relieves pressure points and demonstrates the value of IT service management.
Designing a Defense for Mobile Applications
Learn about the various considerations for defending mobile applications - from the application architecture itself to the myriad testing technologies.
Build a business case: developing custom apps
Learn how to maximize the value of custom applications by accelerating and simplifying their development.