A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Byte and Packet Congestion Notification
Author(s) : B. Briscoe
Filename : draft-briscoe-tsvwg-byte-pkt-mark-01.txt
Pages : 29
Date : 2007-11-19
This memo concerns dropping or marking packets using active queue
management (AQM) such as random early detection (RED) or pre-
congestion notification (PCN). It answers the question of whether to
take packet size into account when network equipment writes
congestion notification, or when transports read it. The primary
conclusion is that the variant of RED that gives lower drop
probability to smaller packets (byte-mode packet drop) should not be
used because it creates a perverse incentive for transports to use
tiny segments, consequently also opening up a DoS vulnerability.
TCP's lack of attention to packet size and its sensitivity to loss of
SYNs and ACKs should be fixed in TCP, not by reverse engineering
network forwarding to fix transport protocols. Nonetheless raw drop-
tail is just as vulnerable to gaming by small packets, so AQM itself
should not be turned off.
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