active measurement tool for the euqos project rené serral-gracià (universitat politècnica de...

Active Measurement tool for the EuQoS project

René Serral-Gracià

(Universitat Politècnica de Catalunya)

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Outline

• Introduction

• NetMeter

• Working examples

• Summary and Future Work

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Introduction (I)

• Internet is fast expanding– New concerns– ...– Network performance

• Increasing needs of– Bandwidth– More and better services

• Videoconference• VoIP

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Introduction (II)

• Usually new services require– Low latencies– Small Delay variations– Few packet losses

• Network administrators need to know– The real network’s performance– If the network is able to provide the

desired service

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Introduction (III)

• Assuring the QoS of the network– Bandwidth– One Way Delay (OWD)– Inter Packet Delay Variation (IPDV)– Packet Losses

• Goal– Develop a solid testing methodology

• NetMeter

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Outline

• Introduction

• NetMeter

• Working examples

• Summary and Future Work

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NetMeter

• Overview

• Measurement capabilities

• Data analysis and representation

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Overview

• Basic scenario

Networkunder test

TrafficSource

TrafficDestination

TestManager

Control traffic Control traffic

Test flow/s

Synchronization

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Measurement Capabilities (I)

• Controlled data flows– UDP

• Periodic• Poisson• Link bandwidth capacity

– TCP• Link bandwidth capacity

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Measurement Capabilities (II)

• Active testing– Controlled traffic– End to End measurements

• Passive testing– Multiple capture points– Partial delays

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Measurement Capabilities (III)

• NetMeter’s characteristics– GPL (http://www.ccaba.upc.edu/netmeter)– Ongoing work– Controlled data flows– Non intrusive

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Data analysis/representation

• Typical QoS parameters (Numeric)– Maximum– Minimum– Average

• Graphical representations– Instantaneous– Distributions– Custom representations

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Outline

• Introduction

• NetMeter

• Working examples

• Summary and Future Work

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Working examples

• Inter-Domain QoS Analysis (EuQoS)– Combination of active and passive

methods

• 802.11 Handover study– QoS preservation during handover

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Inter-Domain QoS Analysis

• Typical Inter-Domain scenario (EuQoS)

Access Network

1

Core IP network

“QoS” domain “QoS” domain “QoS” domain

Access Network

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Test Manager

TrafficSource

TrafficDestination

Capture

1 2 3 4

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Inter-Domain QoS Analysis

• Site to Site results

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Wireless analysis (I)

• Handover analysis– Layer 2

• IPv6/Mobile IPv6– Layer 3

• User’s level perception

• Tests– 16 tests

• MN CN• CN MN

– Flows• VoIP - 64Kbps. 34 pps, 252 bytes/pkt• UDP - 1Mbps. 94 pps, 1300 bytes/pkt

HomeAgent

AccessRouter

GPSNTP-Server

Mobile Node

CorrespondentNode

802.11b 802.11b

Test FlowMIPv6 DataControl + NTPMovement

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Wireless analysis (II)

• Handover latency– Wireless LAN (802.11)

• New Access Point association

– IPv6• Router Advertisement• Route expiration• DAD

– Mobile IPv6• Home Agent notification

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Wireless analysis (III)

• Handover behavior

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Wireless analysis (IV)

• Numerical results CN MN

• Numerical results MN CN

OWD (ms) IPDV (ms)

Before After Before After

1Mbps 46.88 29.88 153.77 6.39

OWD (ms) IPDV (ms)

Before After Before After

VoIP 49.68 48.94 6.92 7.08

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Outline

• Introduction

• NetMeter

• Working examples

• Summary and Future Work

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Summary

• NetMeter– Active measurement– Passive measurement

• NetMeter’s applicability– Inter-Domain QoS Analysis– Wireless LAN/IPv6/Mobile IPv6– General End to End environment

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Future Work

• NetMeter– Support for other traffic generation tools

• EuQoS– Site to Site tests with QoS

• Mobile IPv6– Test improvements with other protocols

• Fast Handovers

Active Measurement tool for the EuQoS project

René Serral-Gracià

(Universitat Politècnica de Catalunya)