Active Measurement tool for the EuQoS project

René Serral-Gracià

(Universitat Politècnica de Catalunya)

2

Outline

• Introduction

• NetMeter

• Working examples

• Summary and Future Work

3

Introduction (I)

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

• Increasing needs of– Bandwidth– More and better services

• Videoconference• VoIP

4

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

5

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

6

Outline

• Introduction

• NetMeter

• Working examples

• Summary and Future Work

7

NetMeter

• Overview

• Measurement capabilities

• Data analysis and representation

8

Overview

• Basic scenario

Networkunder test

TrafficSource

TrafficDestination

TestManager

Control traffic Control traffic

Test flow/s

Synchronization

9

Measurement Capabilities (I)

• Controlled data flows– UDP

• Periodic• Poisson• Link bandwidth capacity

– TCP• Link bandwidth capacity

10

Measurement Capabilities (II)

• Active testing– Controlled traffic– End to End measurements

• Passive testing– Multiple capture points– Partial delays

11

Measurement Capabilities (III)

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

12

Data analysis/representation

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

• Graphical representations– Instantaneous– Distributions– Custom representations

13

Outline

• Introduction

• NetMeter

• Working examples

• Summary and Future Work

14

Working examples

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

methods

• 802.11 Handover study– QoS preservation during handover

15

Inter-Domain QoS Analysis

• Typical Inter-Domain scenario (EuQoS)

Access Network

1

Core IP network

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

Access Network

2

Test Manager

TrafficSource

TrafficDestination

Capture

1 2 3 4

16

Inter-Domain QoS Analysis

• Site to Site results

17

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

18

Wireless analysis (II)

• Handover latency– Wireless LAN (802.11)

• New Access Point association

– IPv6• Router Advertisement• Route expiration• DAD

– Mobile IPv6• Home Agent notification

19

Wireless analysis (III)

• Handover behavior

20

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

22

Outline

• Introduction

• NetMeter

• Working examples

• Summary and Future Work

23

Summary

• NetMeter– Active measurement– Passive measurement

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

24

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)