NOTE: Please consider the following notes as more of a brain dump instead of a well thought out document.

Update 06/07/2018

• Looked into Traffic Differentiation - Rate Limiting vs. Traffic Prioritization (QoS)
• Conclusions: 
  • Min RTT essentially reflects fixed delay, while average RTT subsumes variations and path load
    
  • TCP Segment drops manifest as large increases in delay
    
  • QoS can be implemented in at least two ways: 
    • When priorities are implemented, ICMP packets will only be dropped if ICMP quota is full and link is congested, otherwise ICMP traffic is allowed to go beyond quota
    • When rate-limits are implemented, ICMP packets will be dropped when ICMP quota is met, even if links are not congested
  • Path loads dictate latency estimates: With weighted QoS implementations, loaded links depress ICMP
• Found relevant papers and technical reports. The intent here is to understand the components of latency to help with the evaluation.

  • Y. Zhang, N. Duffield, V. Paxson, S. Shenker, On the Constancy of Internet Path Properties, in ACM SIGCOMM Internet Measurement Workshop 2001

  • A. Acharya, J. Saltz, A Study of Internet Round-Trip Delay, Univ of Maryland, Tech Rep. CS-TR-3736

  • M. Allman, V. Paxson, On Estimating End-to-End Network Path Properties, in ACM SIGCOMM 1999

  • V. Paxson, G. Almes, J. Mathis, Framework for IP Performance Metrics

• Setup NeuBot and experimented with tests but wasn't able to find useful examples of traffic differentiation (see https://www.measurementlab.net/tests/)
• Skimmed Glasnost to understand traffic shaping (see http://broadband.mpi-sws.org/transparency/glasnost.php and https://github.com/marcelscode/glasnost)
• [Not Relevant] Miscellaneous notes on ICMP Traceroutes, MPLS tunneling & ICMP (see http://cluepon.net/ras/traceroute.pdf), Measuring Performance

What are we investigating?

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$ sudo ./ping-vs-tcp.pl --prot 4 --port 80 --count 3 | tee 2018-03-02-ps-v4-uk.log

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