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Detective Integrating NDT and E2E piPEs

• Richard Carlson
• rcarlson_at_internet2.edu
• Internet2

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System Architecture
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Internal Measurement Infrastructure Components
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Internal Measurement Infrastructure Tests

• Abilene Measurement Infrastructure monitors
  backbone with ongoing tests
• BWCTL/Iperf
• OWAMP
• Traceroute
• To reach the desktop we need custom tests from
  the topologically nearest measurement node to
  the end user desktop.
• PacketCrafter (TBD)

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Reaching the Desktop

• Running test to/from user desktop
• Test program may not be installed
• Test program may not be available
• AAA issues
• Who can run tests
• Who can review the results
• How are results archived
• Plan is to enhance the Internet2 Detective and
  NDT system to achieve this goal

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NDT Background

• Client/Server based system
• Web100 enhanced server handles testing and
  diagnostic services
• Java based client allows testing to any desktop
• Performance and configuration faults reported
  back to client
• Drill-down functions provide more details error
  reporting capabilities

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NDT drawbacks

• Must know URL for each server
• Network path to server may be unknown
• Hard to know which server is best
• Closest to desktop is better for local
  configuration diagnostics
• Closest to destination is better for E2E
  performance diagnostics

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Detective Features

• Federated mode of operation
• Multiple piPEs measurement node servers operating
  as single system
• Client automatically re-directed to closest
  piPEs measurement node server
• Prefer configuration diagnostics
• Enhanced diagnostic functions
• Enhanced drill-down functions
• Enhanced reporting functions

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Enhanced Diagnostic Functions

• PacketCrafter and Web100 data to identify
  configuration problems
• Duplex mismatch
• Excessive errors caused by HW faults
• MTU size and mismatch
• Middlebox in path
• WiFi connection
• Congestion notification
• Excessive Delay
• Operating in half-duplex mode

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Enhanced Diagnostic Functions

• PacketCrafter, OWAMP, BWCTL, Traceroute, and
  Web100 data to identify performance problems
• PMTU size and mismatch
• Middlebox in path
• TCP buffer size

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Enhanced Drill-Down Functions

• Client can obtain performance tuning suggestions
  for destination IP
• Calculated BWDelay product for destination
• Obtain RTT / OWAMP data for destination
• Obtain MTU data for destination
• Client can test to another PMP server
• Test to server in another measurement domain
• Test to server closest to network egress point
• Test to server closest to destination host

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Enhanced Reporting Features

• Server automatically determines appropriate
  contact info
• Local domain (desktop IP)
• Remote domain (destination IP)
• Core domain (Abilene NOC)
• GigaPoP domain
• Raw and derived data automatically forwarded to
  contact

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Server Discovery Module

• User contacts well-known piPEs measurement
  server (any measurement node in federation)
• Contacted piPEs measurement server runs
  traceroute back to desktop IP address
• Discovery Module uses traceroute data to find
  closest server (ingress point)
• Contacted server re-directs client to that
  measurement server

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Detective Operation

• User presses Detective applets START button
  to begin testing
• PacketCrafter testing module runs tests and
  Analysis module returns results
• Drill-down buttons activate at end of test
• Statistics button
• More Details button
• Continue Testing button
• Report Problems button

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Detective Integrated NDT and piPEs Architecture
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Detective Measurement Software Components
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Continue Testing Button

• User can enter destination name/address
• Obtain TCP tuning suggestions
• User can request test to remote piPEs measurement
  servers
• Allows performance testing of network path from
  end host
• User can request inter-piPEs-measurement-server
  tests and test results
• Access to partial path, intermediate node BWCTL,
  OWAMP, and Traceroute data

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Conclusions

• Divide conquer approach to diagnostic and
  troubleshooting procedures
• Serious desktop configuration problems will be
  found quickly with little impact on backbone
  network
• Detective will provide single point of contact
  to piPEs measurement framework

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