Pavlos Papageorge
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Network Error Logging: Client-side measurement of end-to-end web service reliability
Ben Jones
Brian Rogan
Charles Stahl
Douglas Creager
Harsha V. Madhyastha
Ilya Grigorik
Julia Elizabeth Tuttle
Lily Chen
Misha Efimov
17th USENIX Symposium on Networked Systems Design and Implementation, NSDI 2020
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We present NEL (Network Error Logging), Google’s planet scale, client-side, network reliability measurement system. NEL is implemented in Chrome and has been proposed as a new W3C standard, letting any web site operator collect reports of clients’ successful and failed requests to their sites. These reports are similar to web server logs, but include information about failed requests that never reach serving infrastructure. Reports are uploaded via redundant failover paths, reducing the likelihood of shared-fate failures of report uploads. We have used NEL to monitor all of Google’s domains since 2014, allowing us to detect and investigate instances of DNS hijacking, BGP route leaks, protocol deployment bugs, and other problems where packets might never reach our servers. This paper presents the design of NEL, case studies of real outages, and deployment lessons for other operators who choose to use NEL to monitor their traffic.
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An Internet-Wide Analysis of Traffic Policing
Tobias Flach
Luis Pedrosa
Tayeb Karim
Ethan Katz-Bassett
Ramesh Govindan
SIGCOMM (2016)
Preview abstract
Large flows like videos consume significant
bandwidth. Some ISPs actively manage these high volume
flows with techniques like policing, which enforces a flow
rate by dropping excess traffic. While the existence of policing
is well known, our contribution is an Internet-wide study
quantifying its prevalence and impact on video quality metrics.
We developed a heuristic to identify policing from
server-side traces and built a pipeline to deploy it at scale on
hundreds of servers worldwide within one of the largest online
content providers. Using a dataset of 270 billion packets
served to 28,400 client ASes, we find that, depending on region,
up to 7% of lossy transfers are policed. Loss rates are
on average 6× higher when a trace is policed, and it impacts
video playback quality. We show that alternatives to policing,
like pacing and shaping, can achieve traffic management
goals while avoiding the deleterious effects of policing.
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Passive aggressive measurement with MGRP
Preview
Justin McCann
Michael Hicks
SIGCOMM '09: Proceedings of the ACM SIGCOMM 2009 conference on Data communication, ACM, New York, NY, USA, pp. 279-290
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