A New Internet-Draft is available from the on-line Internet-Drafts
directories.
This draft is a work item of the Transport Area Working Group
Working Group of the IETF.
Title : Byte and Packet Congestion Notification
Author(s) : B. Briscoe
Filename : draft-ietf-tsvwg-byte-pkt-congest-01.txt
Pages : 37
Date : 2009-10-22
This memo concerns dropping or marking packets using active queue
management (AQM) such as random early detection (RED) or pre-
congestion notification (PCN). The primary conclusion is that packet
size should be taken into account when transports read congestion
indications, not when network equipment writes them. Reducing drop
of small packets has some tempting advantages: i) it drops less
control packets, which tend to be small and ii) it makes TCP's bit-
rate less dependent on packet size. However, there are ways of
addressing these issues at the transport layer, rather than reverse
engineering network forwarding to fix specific transport problems.
Network layer algorithms like the byte-mode packet drop variant of
RED should not be used to drop fewer small packets, because that
creates a perverse incentive for transports to use tiny segments,
consequently also opening up a DoS vulnerability.
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