Increasingly-intense distributed denial-of-service (DDOS) attacks on ISP backbones are surpassing providers' capacity and knocking customers offline, according to a new survey of service providers by Arbor Networks.

While most large ISPs have upgraded their backbones to 10-Gbit/s speeds over the past two years, three respondents said they have experienced sustained attacks from 20- to 22 Gbit/s, and one hosting services provider in the survey reported a 24-Gbit/s DNS-targeted attack. The most powerful sustained attack previously was 17 Gbit/s, which was reported in last year's survey by Arbor. 

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Related topics: Cyberattack, Cybercrime, Security