RFC 4884 on Extended ICMP to Support Multi-Part Messages

rfc-editor@rfc-editor.org Tue, 01 May 2007 03:58 UTC

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Subject: RFC 4884 on Extended ICMP to Support Multi-Part Messages
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A new Request for Comments is now available in online RFC libraries.

        RFC 4884

        Title:      Extended ICMP to Support Multi-Part 
        Author:     R. Bonica, D. Gan,
                    D. Tappan, C. Pignataro
        Status:     Standards Track
        Date:       April 2007
        Mailbox:    rbonica@juniper.net, 
                    Dan.Tappan@gmail.com, cpignata@cisco.com
        Pages:      19
        Characters: 42169
        Updates:    RFC0792, RFC4443

        I-D Tag:    draft-bonica-internet-icmp-16.txt

        URL:        http://www.rfc-editor.org/rfc/rfc4884.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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