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Dissecting Round Trip Time on the Slow Path with a Single Packet

Dissecting Round Trip Time on the Slow Path with a Single Packet. Pietro Marchetta , Alessio Botta , Ethan Katz-Bassett, and Antonio Pescape Pam’14. Introduction. Round Trip Time (RTT) An RTT sample => difficult to interpret RTT values or tease apart the contributing factors.

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Dissecting Round Trip Time on the Slow Path with a Single Packet

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  1. Dissecting Round Trip Time on the Slow Path with a Single Packet Pietro Marchetta, AlessioBotta, Ethan Katz-Bassett, and Antonio Pescape Pam’14

  2. Introduction • Round Trip Time (RTT) • An RTT sample => difficult to interpret RTT values or tease apart the contributing factors. • Two possibilities • traceroute TTL-limited probe and ICMP Time Exceeded reply • Ping an intermediate hop and the destination

  3. Introduction

  4. Dissecting RTT (into two distinct chunks)

  5. Dissecting RTT • IP hearder • IP Prespecified Timestamp option (TS option) • X|ABCD • X => destination • ABCD => the ordered list of IPs

  6. Dissecting RTT • Compliant node W • The part of the path • Honors the TS option • Provides timestamps both on the forward and reverse • Ping or traceroute => all nodes • D|YDDY =>4 timestamps => compliant node

  7. Dissecting RTT • IP options • Higher RTT, jitter, packet loss • Provide insight into current condition of network links and routers • Accuracy Concerns • Clock drift

  8. Evaluation

  9. Evaluation

  10. Evaluation

  11. Evaluation

  12. thanks

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