A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Adaptation Layer Fragmentation Indication
Author(s) : Carsten Bormann
Filename : draft-bormann-intarea-alfi-00.txt
Pages : 13
Date : 2012-04-25
IPv6 defines a minimum MTU of 1280 bytes. Many link layers are more
limited in their choice of packet size. Typically, IP adaptation
layers for these link layers define a segmentation or fragmentation
scheme to transport larger IP packets in multiple link layer packets.
Often, adaption layer fragmentation schemes reduce some performance
metric, such as the packet delivery rate. Where application or
transport protocols have a choice, it would therefore be desirable
for them to know about any adaptation layer fragmentation that is
going on, so they can choose packet sizes that minimize adaptation
layer fragmentation.
At the IP layer, fragmentation can be detected using a number of
mechanisms used in Packetization Layer Path MTU Discovery [RFC4821].
However, adaptation later fragmentation schemes are often designed to
be "transparent", i.e. there is no way at higher layers to find out
they had to be employed (except maybe by elaborate measurement
schemes targeting one of the impacted performance metrics; this
approach does not appear to be viable) [WEI].
The present specification defines a mechanism for IPv6 adaptation
layers to indicate the presence of adaptation layer fragmentation, as
well as an indication of preferred packet sizes.
The main objective of this version of the draft is to present a
complete design in order to be able to gauge the complexity of the
approach against the gains to be expected from implementing it.
Comments are appreciated and should go to the intarea@ietf.org
mailing list.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-bormann-intarea-alfi-00.txt
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
This Internet-Draft can be retrieved at:
ftp://ftp.ietf.org/internet-drafts/draft-bormann-intarea-alfi-00.txt
The IETF datatracker page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-bormann-intarea-alfi/
_______________________________________________
I-D-Announce mailing list
I-D-Announce@ietf.org
https://www.ietf.org/mailman/listinfo/i-d-announce
Internet-Draft directories: http://www.ietf.org/shadow.html
or ftp://ftp.ietf.org/ietf/1shadow-sites.txt