I-D ACTION:draft-bonica-internet-icmp-12.txt

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	Title		: Modifying ICMP to Support Multi-part Messages
	Author(s)	: R. Bonica, et al.
	Filename	: draft-bonica-internet-icmp-12.txt
	Pages		: 20
	Date		: 2006-11-6
	
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 a subset of the above mentioned ICMP
   messages by specifying a length attribute.  Many of the 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 draft
   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
   presented.

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