John Heidemann

Anycast vs. DDoS: Evaluating Nov. 30

TitleAnycast vs. DDoS: Evaluating Nov. 30
Publication TypeMiscellaneous
Year of Publication2016
AuthorsJ. Heidemann, G. C. M. Moura, R. O. de Schmidt, W. B. and de Vries, M. Muller, L. Wei, and C. Hesselman

Distributed Denial-of-Service (DDoS) attacks continue to be a major threat in the Internet today. DDoS attacks overwhelm target services with requests or other ``bogus'' traffic, causing requests from legitimate users to be shut out. A common defense against DDoS is to replicate the service in multiple physical locations or sites. If all sites announce a common IP address, BGP will associate users around the Internet with a nearby site, defining the \emphcatchment of that site. Anycast adds resilience against DDoS both by increasing capacity to the aggregate of many sites, and allowing each catchment to contain attack traffic leaving other sites unaffected. IP anycast is widely used for commercial CDNs and essential infrastructure such as DNS, but there is little evaluation of anycast under stress. \newlineındent This talk will provide a \emphfirst evaluation of several anycast services under stress with public data. Our subject is the Internet's Root Domain Name Service, made up of 13 independently designed services (``letters'', 11 with IP anycast) running at more than 500 sites. Many of these services were stressed by sustained traffic at 100x normal load on Nov. 30 and Dec. 1, 2015. We use public data for most of our analysis to examine how different services respond to the these events. In our analysis we identify two policies by operators: (1) sites may \emphabsorb attack traffic, containing the damage but reducing service to some users, or (2) they may \emphwithdraw routes to shift both legitimate and bogus traffic to other sites. We study how these deployment policies result in different levels of service to different users, during and immediately after the attacks. \newlineındent We also show evidence of \emphcollateral damage on other services located near the attack targets. The work is based on analysis of DNS response from around 9000 RIPE Atlas vantage points (or ``probes''), agumented by RSSAC-002 reports from 5 root letters and BGP data from BGPmon. We examine DNS performance for each Root Letter, for anycast sites inside specific letters, and for specific servers at one site.

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