More changes from last time: Added a section on "Possible Complication: Router or Middlebox-based ACK Mechanisms". Feedback from Sara Landstrom. Added that SACK is required with ACK congestion control. Feedback from Sara Landstrom. Added a discussion of "Reducing the TCP Acknowledgment Frequency" to the related work section. Added an appendix on "Design Considerations", with a subsection on "The TCP ACK Ratio Option, or an AckNow bit in data packets?". General editing from feedback from Alfred Hoenes. |