P. Karn. Dropping TCP acks. Mail to the end-to-end mailing list, February 1996.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....timer (usually set at 200 ms) causes the resumption of the transfer. 4.2.2 Ack Filtering (AF) The ACC mechanism described above modifies the TCP stack at the receiver in order to decrease the frequency of acks on the constrained reverse link. Ack filtering, based on an idea suggested by Karn [15], is a gateway based technique that decreases the number of TCP acks 2. The gateway can also be configured to drop the selected packet (Random Early Drop) but we chose to mark it instead. sent over the constrained channel by taking advantage of the fact that TCP acks are cumulative. When an ack ....

P. Karn. Dropping TCP acks. Mail to the end-to-end mailing list, February 1996.

....of acknowledgements over the slow reverse channel could throttle the flow of data packets. One way of alleviating this problem is to reduce the size of the acknowledgement packets using techniques such as SLIP header compression [13] Another is to send TCP acknowledgements less frequently (e.g. [16]) although care must be taken to ensure that the sender does not become very bursty as a result. This may be achieved by regulating the transmission of data at a consistent rate within the TCP congestion window, using the ratio of window size to smoothed round trip time as an estimate of this ....

P. Karn. Dropping TCP acks. Mail to the endto -end mailing list, February 1996.

....the choice of drop policy makes a difference to performance in some cases. 6.2 Ack Filtering (AF) The ACC mechanism described above modifies the TCP stack at the receiver in order to decrease the frequency of acks on the constrained reverse link. Ack filtering, based on an idea suggested by Karn [17], is a gateway based technique that decreases the number of TCP acks sent over the constrained channel by taking advantage of the fact that TCP acks are cumulative. When an ack from the receiver is about to be enqueued, the router (or the end host s routing layer, if the host is directly ....

P. Karn. Dropping TCP acks. Mail to the end-to-end mailing list, February 1996.

....with an end to end security mechanism such as IPSEC [2] On the downside, though, the RED algorithm may not respond quickly enough to congestion when transfers are short in length. We discuss this issue in Section 9.4.1. 9.3.1. 2 Ack Filtering (AF) Ack filtering, based on a suggestion by Karn [60], is an alternative to ACC. It is a router based technique that decreases the number of acks sent over the bandwidth constrained upstream link by taking advantage of the cumulative nature of TCP acks. When an ack is about to be enqueued, the router (or the end host s routing layer, if the host is ....

P. Karn. Dropping TCP acks. Mail to the end-to-end mailing list, February 1996.

....timer (usually set at 200 ms) kicks in and forces an ack to be sent. 4.3.2 Ack Filtering (AF) The ACC mechanism described above modifies the TCP stack at the receiver in order to decrease the frequency of acks on the constrained reverse link. Ack filtering, based on an idea suggested by Karn [15], is a gateway based technique that decreases the number of TCP acks sent over the constrained channel by taking advantage of the fact that TCP acks are cumulative. When an ack from the receiver is about to be enqueued, the router (or the end host s routing layer, if the host is directly connected ....

P. Karn. Dropping TCP acks. Mail to the end-to-end mailing list, February 1996.

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