The ONL Tutorial

Course Material >> For Instructors

TOC

• Chapter 1: Introduction
• Experiment Configuration: 1 NSP
• Variations of Exercises [Q1] and [Q2]
• Concepts: Shows some queueing and congestion and exposes some layering
• ONL Exposure: ping, iperf, monitoring, queues
• Activity
• Use ping to check connections, try out bandwidth monitoring
• Set iperf to run at a rate less than link rate
• Check link rate
• Monitor bandwidth. Ask why bandwidth is not what you think it should be. Point them to portion of ONL explaining the architecture of an NSP and what the bandwidth really represents.
• Look at the bandwidth w/o the header
• Set iperf to run at rate greater than link rate and look at queueing and discard
• Chapter 2: Application Layer
• Experiment Configuration: 1 NSP with loopback and monitoring
• Variations of Exercises XXX and XXX
• Concepts: Simple application layer protocol, more about congestion and effects on application
• ONL Exposure: Independent monitoring and use of iperf. How to build applications in the ONL environment.
• Activity
• Implement simple echo client-server application using standard UDP/TCP (this is a version of the socket programming assignment #3 in the textbook)
• Use iperf to generate cross traffic. See what happens under congestion for each protocol.
• First, just look at application layer, have application print something when packet is lost.
• Use the monitoring tools to look at the drop and congestion (they should know how to do this from above).
• Chapter 3: Transport Layer
• Experiment Configuration: 1 NSP with loopback and monitoring
• Variations of Exercises XXX and XXX
• Concepts: Protocol implementation, exploration of TCP congestion control
• ONL Exposure: Introduction to plugins
• Activity
• Extend echo client-server application to implement stop-and-wait protocol. Introduce congestion. Use counter plugin for monitoring.
• Could continue to extend application to implement more complex protocols.
• Use monitoring to explore TCP congestion control. Ask for snapshots of graphs with annotations explaining the observed behavior.
• Chapter 4: Routing
• Experiment Configuration: 1 NSP with default routing
• Variations of Exercises [R1] through [R5] and [Pxxx] through [Pxxx]
• Concepts: Routing, CIDR, router internals, port processor
• ONL Exposure: Plugin development, advanced queueing, routing tables, topology
• Activity
• Generate default routes and look at routing tables. Make routing table changes to exemplify prefix matching and what it means to have a more specific match. Route to different ports and monitor the bandwidth.
• Add a loopback and make routing table changes. Set up monitoring of input and output ports.
• Read about the NSP architecture.
• Use plugins to redirect, count, do multicast.
• Experiment with WDRR by monitoring queues, and varying quanta and threshold.
• Maybe, turn Distributed Queueing on and off.
• Write a broadcast plugin.
• Chapter 5: Link Layer
• Experiment Configuration: XXX
• XXX
• Concepts: XXXXX
• ONL Exposure: XXXXX
• Activity
• XXXXX
• Chapter 8: Security
• Experiment Configuration: XXX
• XXX
• Concepts: Packet filtering, CRC and parity
• ONL Exposure: XXXXX
• Activity
• Implement packet filtering plugin (section 8.6.1)
• Implement a packet sniffing plugin (section 8.7.2)

Course Material >> For Instructors	TOC