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Offense by Animesh and Amit: 

Offense by Animesh and Amit January 21st, 2005, Rice University eXCP ExCP

Evaluation settings: 

Evaluation settings Comparison with TCP-Reno instead of TCP-Vegas Simulation based evaluation

“Known unknowns”: 

“Known unknowns” Feedback should be floating point Especially with higher number of flows Special format for fractional quantities

“Known unknowns”: 

“Known unknowns” Packet losses not congestion related Enable SACK Disable exponential backoff

“Known unknowns”: 

“Known unknowns” Limitation of sender buffer/receiver window Sender advertises these factors

Capacity estimation: 

Capacity estimation Capacity estimation difficult Proliferating wireless networks Shared capacity channel Optimal utilization cannot be reached

Deployment: 

Deployment Not end-to-end solution Modifications required in routers FAST-TCP (2004) is end-to-end Incremental deployment infeasible All routers must be XCP enabled What if bottleneck router not XCP enabled ? Loss due to congestion but XCP assumes otherwise

Handling packet loss: 

Handling packet loss Packet losses not due to congestion non-XCP bottlenecked router Packet losses due to congestion TCP-like Instability

Reference: 

Reference An Implementation and Experiment Study of the eXplicit Control Protocol (XCP) Y. Zhang and T. Henderson, Infocom 2005

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