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PCP a Savior or a Saboteur?

Presented by Ao-Jan Su, this text questions the accuracy and security of PCPa (End Point Router Support) like TCP, Vegas, RAP, Fast TCP, S-TCP, DecBit, ECN, RED, AQM, Request and Set PCP, ATM, XCP, WFQ, RCP. Probe test accuracy, efficiency, overhead, security, and network impact are explored. Discusses link utilization, probe packets, oscillation, and challenges in avoiding DDoS attacks. The paper evaluates controls, efficiency, fairness, distributedness, and convergence criteria, highlighting the vulnerability of end hosts compared to routers.

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PCP a Savior or a Saboteur?

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  1. PCPa Savior or a Saboteur? Presented by: Ao-Jan Su

  2. New, is NOT necessarily Good!! Not Accurate Not Secure End Point Router Support Try and Backoff TCP, Vegas, RAP, Fast TCP, S-TCP High Speed TCP DecBit, ECN, RED, AQM Request and Set PCP ATM, XCP, WFQ, RCP Additional Overhead

  3. Accuracy • Probe results’ accuracy? • PCP’s probe test is similar to pathload [Jain and Dovrolis] • pathload underestimates the available bandwidth when there are multiple tight link • Longer paths suffer more • Clock Skew? • Timestamp is recorded at the receiver!

  4. Efficiency • Criteria for Selecting Controls • Efficiency, Fairness, Distributedness and Convergence [AIMD paper] • Lack for link utilization analysis in the paper • Can’t avoid oscillation

  5. Overhead • What is the impact of probe packets to the network? • Periodic probes • Proportional to the number of flows • For short (web) traffic, the overhead can be significant

  6. Security • Also not mentioned in the paper • End hosts are easier to compromise than routers • Encourages DDoS attack

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