OSI connectionless transport services on top of UDP Applicability Statement for Historic Status (RFC2556)
Original Publication Date: 1999-Mar-01
Included in the Prior Art Database: 2019-Feb-11
Internet Society Requests For Comment (RFCs)
RFC 1240, "OSI connectionless transport services on top of UDP", was published as a Proposed Standard in June 1991 but at this time there do not seem to be any implementations which follow RFC 1240. In addition there is a growing concern over using UDP-based transport protocols in environments where congestion is a possibility This memo provides information for the Internet community.
Network Working Group S. Bradner Request for Comments: 2556 Harvard University Category: Informational March 1999
OSI connectionless transport services on top of UDP Applicability Statement for Historic Status
Status of this Memo
This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited.
Copyright (C) The Internet Society (1999). All Rights Reserved.
RFC 1240, "OSI connectionless transport services on top of UDP", was published as a Proposed Standard in June 1991 but at this time there do not seem to be any implementations which follow RFC 1240. In addition there is a growing concern over using UDP-based transport protocols in environments where congestion is a possibility.
1. Use of RFC 1240 Technology
A message was sent to the IETF list in October 1998 seeking any information on the actual use of the technology described in RFC 1240. A number of responses were received, including from the International Organization for Standardization (ISO), the keeper of the OSI protocols. None of these messages pointed to any current use for this technology. Most of the messages which made any recommendation did recommend that RFC 1240 be moved to historic.
2. Responsiveness to Congestion
Since 1991 there has been a great deal of experience with the complexities of dealing with congestion in the Internet. Congestion control algorithms have been improved but there is still work underway to further understand the issues. In this environment any UDP-based protocol is somewhat worrisome since quite frequently people who use UDP-based protocols invent their own reliability and congestion control functions which may not include the results of the current state of the art. This leads to a dange r of congestion collapse with potentially quite serious consequences for the network in which it is run. See RFC 896 for a discussion of congestion
Bradner Informational [Page 1]
RFC 2556 RFC 1240 to Historic March 1999
In the case of RFC 1240, the authors seemed to assume that if some level of reliability was needed in an RFC 1240 environment that the reliability algorithms and the congestion control algorithms which would then be required would reside in the OSI protocols running over the UDP transport. It is far from clear that any perceived advantages of running over UDP would not be eclipsed by the difficulties experienced in trying to create a reasonable congestion control algorithm. Implementers would likely find that running over TCP as RFC 2126 describes is the better choice.
Due to the lack of use of the technology described in RFC 1240 and the issues surrounding congestion control in the Internet, RFC 1240 should be reclassified as Historic and its implementation actively discouraged.
4. Security Considerations
This type of non-protocol document does not directly effect the security of...