Mapping between LPD and IPP Protocols
Network Working Group R. Herriot
Request For Comments: 2569 Xerox Corporation
Category: Experimental N. Jacobs
Sun Microsystems, Inc.
Mapping between LPD and IPP Protocols
Status of this Memo
This memo defines an Experimental Protocol for the Internet
community. It does not specify an Internet standard of any kind.
Discussion and suggestions for improvement are requested.
Distribution of this memo is unlimited.
Copyright (C) The Internet Society (1999). All Rights Reserved.
This document defines an Experimental protocol for the Internet
community. The IESG expects that a revised version of this protocol
will be published as Proposed Standard protocol. The Proposed
Standard, when published, is expected to change from the protocol
defined in this memo. In particular, it is expected that the
standards-track version of the protocol will incorporate strong
authentication and privacy features, and that an "ipp:" URL type will
be defined which supports those security measures. Other changes to
the protocol are also possible. Implementors are warned that future
versions of this protocol may not interoperate with the version of
IPP defined in this document, or if they do interoperate, that some
protocol features may not be available.
The IESG encourages experimentation with this protocol, especially in
combination with Transport Layer Security (TLS) [RFC 2246], to help
determine how TLS may effectively be used as a security layer for
Herriot, et al. Experimental [Page 1]
RFC 2569 Mapping between LPD and IPP Protocols April 1999
This document is one of a set of documents, which together describe
all aspects of a new Internet Printing Protocol (IPP). IPP is an
application level protocol that can be used for distributed printing
using Internet tools and technologies. This document gives some
advice to implementers of gateways between IPP and LPD (Line Printer
Daemon). This document describes the mapping between (1) the commands
and operands of the 'Line Printer Daemon (LPD) Protocol' specified in
RFC 1179 and (2) the operations, operation attributes and job
template attributes of the Internet Printing Protocol/1.0 (IPP). One
of the purposes of this document is to compare the functionality of
the two protocols. Another purpose is to facilitate implementation
of gateways between LPD and IPP.
WARNING: RFC 1179 was not on the IETF standards track. While RFC
1179 was intended to record existing practice, it fell short in some
areas. However, this specification maps between (1) the actual
current practice of RFC 1179 and (2) IPP. This document does not
attempt to map the numerous divergent extensions to the LPD protocol
that have been made by many implementers.
The full set of IPP documents includes:
Design Goals for an Internet Printing Protocol [RFC2567]
Rationale for the Structure and Model and Protocol for the
Internet Printing Protocol [RFC2568]
Internet Printing Protocol/1.0: Model and Semantics [RFC2566]
Internet Printing Protocol/1.0: Encoding and Transport [RFC2565]
Internet Printing Protocol/1.0: Implementors Guide [ipp-iig]
Mapping between LPD and IPP Protocols (this document)
The document, "Design Goals for an Internet Printing Protocol", takes
a broad look at distributed printing functionality, and it enumerates
real-life scenarios that help to clarify the features that need to be
included in a printing protocol for the Internet. It identifies
requirements for three types of users: end users, operators, and
administrators. It calls out a subset of end user requirements that
are satisfied in IPP/1.0. Operator and administrator requirements are
out of scope for version 1.0.
The document, "Rationale for the Structure and Model and Protocol for
the Internet Printing Protocol", describes IPP from a high level
view, defines a roadmap for the various documents that form the suite
of IPP specifications, and gives background and rationale for the
IETF working group's major decisions.
Herriot, et al. Experimental [Page 2]
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