Performance Implications of Link Characteristics (pilc)
-------------------------------------------------------
Charter
Last Modified: 2002-05-13
Current Status: Active Working Group
Chair(s):
Spencer Dawkins <
[email protected]>
Aaron Falk <
[email protected]>
Transport Area Director(s):
Scott Bradner <
[email protected]>
Allison Mankin <
[email protected]>
Transport Area Advisor:
Allison Mankin <
[email protected]>
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Description of Working Group:
Erik Nordmark (
[email protected]) is the Technical Advisor.
The Internet network-layer and transport-layer protocols are
designed to accommodate a very wide range of networking
technologies and characteristics. Nevertheless, experience has shown
that the particular properties of different network links can have a
significant impact on the performance of Internet protocols operating
over those links, and on the performance of connections along paths
that
include such links. This is especially of concern to the wireless
networking community.
The PILC working group will produce several BCP/Informational
documents. The first document will discuss considerations for
link-layer designers from the perspective of best supporting existing
IETF protocols will be produced. The next document will discuss the
capabilities, limitations and pitfalls of 'performance enhancing
proxies' (PEPs), that is, active network elements that modify or splice
end-to-end flows in an attempt to enhance the performance they attain
in
the face of particular link characteristics. The remaining documents
will either discuss the impact and mitigations for a problematic
link-layer characteristic (or group of closely related
characteristics),
or provide overviews of which other PILC documents apply to particular
problem domains.
As one of its first work items, the WG will review an existing
I-D on considerations for "long, thin" networks (one of the salient
characteristics of terrestrial wireless links). This will be
published as a preliminary assessment of the problem domain, to
be refined by later PILC documents.
All documents will identify which of their considerations remain
research topics versus which are established as advanced
development. Research topics will be explicitly flagged as not
part of any recommendations. All documents will also identify
any security implications associated with their considerations.
The working group will also serve as a forum for discussing
possible modifications to IETF protocols to improve performance
in environments with problematic link characteristics - however,
not to the detriment of performance and stability in the general
Internet, nor to undermine existing security models.
It is incumbent upon the chairs to ensure that the WG maintains
good communications with other groups interested in related
technology issues, such as wireless forums.
Goals and Milestones:
Done Submit Internet-Draft on significantly low bandwidth links.
Done Submit Internet-Draft on significantly lossy links.
Done Submit Internet-Draft on long-thin networks (based on
draft-montenegro-pilc-ltn-01.txt) submitted to the IESG for
publication.
Done Draft of link-layer design considerations document.
Done Draft of PEP capabilities and limitations document.
Done Draft on asymmetric network paths.
Done Document on lossy links to IESG for publication as BCP.
Done Document on PEP capabilities and limitations submitted for
publication as Informational.
Done Document on low bandwidth links to IESG for publication as
BCP.
Aug 01 Draft of TCP Over Wireless document to the IESG as BCP
Apr 02 Document on link-layer design considerations submitted for
publication as BCP.
Done Document on asymmetric network paths submitted to the IESG for
publication as BCP.
Internet-Drafts:
Posted Revised I-D Title <Filename>
------ ------- --------------------------------------------
Sep 99 Jul 02 <draft-ietf-pilc-link-design-12.txt>
Advice for Internet Subnetwork Designers
Oct 99 Oct 02 <draft-ietf-pilc-asym-08.txt>
TCP Performance Implications of Network Path Asymmetry
Feb 01 Jul 02 <draft-ietf-pilc-2.5g3g-10.txt>
TCP over Second (2.5G) and Third (3G) Generation Wireless
Networks
Request For Comments:
RFC Stat Published Title
------- -- ----------- ------------------------------------
RFC3135 I Jul 01 Performance Enhancing Proxies Intended to Mitigate
Link-Related Degradations
RFC3150BCP Aug 01 End-to-end Performance Implications of Slow Links
RFC3155BCP Aug 01 End-to-end Performance Implications of Links with
Errors
RFC3366BCP Sep 02 Advice to link designers on link Automatic Repeat
reQues (ARQ)
