Relative Network Positioning via CDN Redirections. A. Su, D. Choffnes , F. Bustamante, A. Kuzmanovic ICDCS 2008 Presented by: Imranul Hoque. Relative Network Positioning. Replica 2. Replica 1. Replica 3. How to calculate RTT?. Which one to choose?. Relative Position. 1. Replica 2
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A. Su, D. Choffnes, F. Bustamante, A. Kuzmanovic
Presented by: ImranulHoque
How to calculate RTT?
Which one to choose?
1. Replica 2
2. Replica 1
3. Replica 3
RTT(C, R2) < RTT(C, R1) < RTT(C, R3)
Leverage CDN to deduce relative position
CDN performs extensive measurement to redirect clients to closest replicas
0, 0, 10, 20, 70
70, 30, 0, 0 , 0
0, 0, 0, 80, 20
50, 50, 0, 0 , 0
Who is the closest of the 240 nodes?
Server: 240 PlanetLab nodes
Client: 1000 DNS Servers from King data
November 2006 & January 2007
How can they be similar?
CRP outperforms Meridian 25% of the time
65% nodes differ < 7 ms
177 broadly distributed DNS servers
Plot is very misleading!
Total Clusters: 16 (ASN), 36 (CRP)