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