Dissecting Round Trip Time on the Slow Path with a Single Packet Pietro Marchetta, Alessio Botta,...
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Transcript of Dissecting Round Trip Time on the Slow Path with a Single Packet Pietro Marchetta, Alessio Botta,...
Dissecting Round Trip Time on the Slow Path with a Single
Packet
Pietro Marchetta, Alessio Botta, Ethan Katz-Bassett, and Antonio PescapePam’14
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
Dissecting RTT• IP hearder• IP Prespecified Timestamp option (TS option)
•X|ABCD • X => destination• ABCD => the ordered list of IPs
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
Dissecting RTT • IP options • Higher RTT, jitter, packet loss• Provide insight into current condition of network links
and routers
• Accuracy Concerns• Clock drift