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SUMMARY:Two Days in the Life of the DNS Anycast Root Servers - Nevil Brown
 lee\, University of Auckland / CAIDA
DTSTART:20070412T153000Z
DTEND:20070412T163000Z
UID:TALK7085@talks.cam.ac.uk
CONTACT:Dr Andrew Moore
DESCRIPTION:The DNS root nameservers routinely use anycast in order to imp
 rove their service to clients and increase their resilience against variou
 s types of failures. We study DNS traffic collected over a two-day period 
 in January 2006 at anycast instances for the C\, F and K root nameservers.
  We analyze how anycast DNS service affects the worldwide population of In
 ternet users.\n\nTo determine whether clients actually use the instance cl
 osest to them\, we examine client locations for each root instance\, and t
 he geographic distances between a server and its clients. We find that fre
 quently the choice\, which is entirely determined by BGP routing\, is not 
 the geographically closest one.\n\nWe also consider specific AS paths and 
 investigate some cases where local instances have a higher than usual prop
 ortion of non-local clients.  We conclude that overall\, anycast roots sig
 nificantly localize DNS traffic\, thereby improving DNS service to clients
  worldwide.\n\nCAIDA have been working on a visualisation for the anycast 
 instances\, producing a 'centre of influence' plot\; this will be presente
 d and discussed.
LOCATION:Lecture Theatre 2\, Computer Laboratory\, William Gates Builiding
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