[rfc-dist] RFC 4884 on Extended ICMP to Support Multi-Part Messages
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Mon Apr 30 20:58:12 PDT 2007
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Title: Extended ICMP to Support Multi-Part
Author: R. Bonica, D. Gan,
D. Tappan, C. Pignataro
Status: Standards Track
Date: April 2007
Mailbox: rbonica at juniper.net,
derhwagan at yahoo.com,
Dan.Tappan at gmail.com, cpignata at cisco.com
Updates: RFC0792, RFC4443
I-D Tag: draft-bonica-internet-icmp-16.txt
This document redefines selected ICMP messages to support multi-part
operation. A multi-part ICMP message carries all of the information
that ICMP messages carried previously, as well as additional
information that applications may require.
Multi-part messages are supported by an ICMP extension structure.
The extension structure is situated at the end of the ICMP message.
It includes an extension header followed by one or more extension
objects. Each extension object contains an object header and object
payload. All object headers share a common format.
This document further redefines the above mentioned ICMP messages by
specifying a length attribute. All of the currently defined ICMP
messages to which an extension structure can be appended include an
"original datagram" field. The "original datagram" field contains
the initial octets of the datagram that elicited the ICMP error
message. Although the original datagram field is of variable length,
the ICMP message does not include a field that specifies its length.
Therefore, in order to facilitate message parsing, this document
allocates eight previously reserved bits to reflect the length of the
"original datagram" field.
The proposed modifications change the requirements for ICMP
compliance. The impact of these changes on compliant implementations
is discussed, and new requirements for future implementations are
This memo updates RFC 792 and RFC 4443. [STANDARDS TRACK]
This is now a Proposed Standard Protocol.
STANDARDS TRACK: This document specifies an Internet standards track
protocol for the Internet community,and requests discussion and
suggestions for improvements.Please refer to the current edition of the
Internet Official Protocol Standards (STD 1) for the standardization
state and status of this protocol. Distribution of this memo is
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