The Infocomm Media Development Authority (IMDA) and the
Cyber Security Agency of Singapore (CSA) have completed the investigations into
StarHub’s home broadband network disruptions that occurred on 22 and 24 October
2016. The investigations revealed that the disruptions were caused by a surge
in legitimate Domain Name System (DNS) traffic and did not point towards a
Distributed Denial of Service (DDoS) attack.
The two incidents affected some StarHub home fibre broadband
customers in several parts of Singapore and lasted 130 and 55 minutes
respectively. During the incidents, affected customers encountered intermittent
difficulties accessing the internet as StarHub’s DNS servers could not fully
handle the high volume web requests.
In the course of investigations, IMDA and CSA have also
identified areas of improvement in StarHub’s home broadband network
infrastructure. Since the incidents, IMDA says StarHub has taken the necessary steps
to mitigate future risks, including increasing its home broadband DNS server
capacity and enhancing traffic monitoring.
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