Faculté des Sciences appliquées
Faculté des Sciences appliquées

Anycast-based DNS in Mobile Networks

Wassermann, Sarah ULiège
Promotor(s) : Donnet, Benoît ULiège
Date of defense : 26-Jun-2017/27-Jun-2017 • Permalink :
Title : Anycast-based DNS in Mobile Networks
Translated title : [fr] Étude du déploiement DNS utilisant anycast dans les réseaux mobiles
Author : Wassermann, Sarah ULiège
Date of defense  : 26-Jun-2017/27-Jun-2017
Advisor(s) : Donnet, Benoît ULiège
Committee's member(s) : Mathy, Laurent ULiège
Leduc, Guy ULiège
Bustamante, Fabian 
Language : English
Number of pages : 51
Keywords : [en] anycast
[en] DNS
[en] mobile networks
[en] cellular networks
[en] 2G
[en] 3G
[en] 4G
[en] Wifi
[en] K-Root
[en] F-Root
[en] Google DNS
Discipline(s) : Engineering, computing & technology > Computer science
Research unit : Aqualab - Northwestern University
RUN - Université de Liège
Target public : Researchers
Professionals of domain
Institution(s) : Université de Liège, Liège, Belgique
Northwestern University, Evanston (IL), United States
Degree: Master en sciences informatiques, à finalité spécialisée en "computer systems and networks"
Faculty: Master thesis of the Faculté des Sciences appliquées


[en] Anycast offers a method for making a service IP address available to a routing system from several locations at once. It is used today to provide important services, such as naming and content delivery, in an economic, scalable, and simple to operate manner. The appeal and clear benefits of anycast to service providers have motivated a number of recent experimental studies on its potential performance impact. All studies have, to the best of our knowledge, focused on wired networks, despite the growing dominance of mobile as the most common and sometimes only form of Internet access. In this paper, we present the first study of anycast performance for mobile users. In particular, our evaluation focuses on three distinct anycast services, K- and F-Root, each providing part the DNS root zone, and Google DNS.

Our research revolves around three axes. First, we show that mobile clients are frequently routed to suboptimal replicas in terms of latency and that this issue is not limited to specific regions or ASes of the world. Second, we find that clients are often redirected to a DNS server hosted very far away from her. This happens more frequently while on a cellular connection than on WiFi, with a significant impact on performance. Our study reveals that this is not simply an issue of not having better alternatives, and that the problem is not localised to particular geographic areas or particular ASes. We investigate root causes of this phenomenon and describe three of the major detected classes of anycast anomalies. Third and finally, we explore IP assignment dynamics of mobile clients and find that recurrent IP changes on the client side lead to significant perceived variations of anycast latency.



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  • Wassermann, Sarah ULiège Université de Liège > Master sc. informatiques, à fin.


Committee's member(s)

  • Mathy, Laurent ULiège Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Systèmes informatiques répartis et sécurité
    ORBi View his publications on ORBi
  • Leduc, Guy ULiège Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Réseaux informatiques
    ORBi View his publications on ORBi
  • Bustamante, Fabian
  • Total number of views 136
  • Total number of downloads 987

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