A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Licklider Transmission Protocol - Specification
Author(s) : M. Ramadas, et al.
Filename : draft-irtf-dtnrg-ltp-07.txt
Pages : 55
Date : 2007-10-17
This document describes the Licklider Transmission Protocol (LTP),
designed to provide retransmission-based reliability over links
characterized by extremely long message round-trip times (RTTs)
and/or frequent interruptions in connectivity. Since communication
across interplanetary space is the most prominent example of this
sort of environment, LTP is principally aimed at supporting "long-
haul" reliable transmission in interplanetary space, but it has
applications in other environments as well.
In an Interplanetary Internet setting deploying the Bundle protocol
that is being developed by the Delay Tolerant Networking Research
Group, LTP is intended to serve as a reliable "convergence layer"
protocol operating in pairwise fashion between adjacent
Interplanetary Internet nodes that are in direct RF communication.
In that operational scenario, and potentially in some other
deployments of the Bundle Protocol, LTP runs directly over a data-
link layer protocol; when this is the case, forward error correction
coding and/or checksum mechanisms in the underlying data-link layer
protocol must assure the integrity of the data passed between the
communicating entities.
In some circumstances, LTP may be used over UDP on the Internet, in
which case the LTP authentication [LTPEXT] extension SHOULD be used
to assure data integrity unless the end-to-end path is one in which
either the likelihood of datagram content corruption is negligible
(as in some private local area networks) or the consequences of
receiving and processing corrupt LTP segments are insignificant (as
perhaps during software development).
Since no mechanisms for flow control or congestion control are
included in the design of LTP, this protocol is not intended or
appropriate for ubiquitous deployment in the global Internet.
However, there are some limited applications where LTP may be safely
used, for example, in a sparse sensor network where the link, when
available, is only used for LTP traffic.
LTP does ARQ of data transmissions by soliciting selective-
acknowledgment reception reports. It is stateful, and has no
negotiation or handshakes.
This document is a product of the Delay Tolerant Networking Research
Group and has been reviewed by that group. No objections to its
publication as an RFC were raised.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-irtf-dtnrg-ltp-07.txt
To remove yourself from the I-D Announcement list, send a message to
i-d-announce-request@ietf.org with the word unsubscribe in the body of
the message.
You can also visit https://www1.ietf.org/mailman/listinfo/I-D-announce
to change your subscription settings.
Internet-Drafts are also available by anonymous FTP. Login with the
username "anonymous" and a password of your e-mail address. After
logging in, type "cd internet-drafts" and then
"get draft-irtf-dtnrg-ltp-07.txt".
A list of Internet-Drafts directories can be found in
http://www.ietf.org/shadow.html
or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
Internet-Drafts can also be obtained by e-mail.
Send a message to:
mailserv@ietf.org.
In the body type:
"FILE /internet-drafts/draft-irtf-dtnrg-ltp-07.txt".
NOTE: The mail server at ietf.org can return the document in
MIME-encoded form by using the "mpack" utility. To use this
feature, insert the command "ENCODING mime" before the "FILE"
command. To decode the response(s), you will need "munpack" or
a MIME-compliant mail reader. Different MIME-compliant mail readers
exhibit different behavior, especially when dealing with
"multipart" MIME messages (i.e. documents which have been split
up into multiple messages), so check your local documentation on
how to manipulate these messages.
Below is the data which will enable a MIME compliant mail reader
implementation to automatically retrieve the ASCII version of the
Internet-Draft.
- <ftp://ftp.ietf.org/internet-drafts/draft-irtf-dtnrg-ltp-07.txt>
-
_______________________________________________
I-D-Announce@ietf.org
https://www1.ietf.org/mailman/listinfo/i-d-announce
