02) Changed the wording of the Security Considerations section to
        avoid dependency loop between this spec and the IPsec specs.

    02) Updated R. Hinden's email address and company affiliation.


        --------------------------------------------------------

    01) In section 3, changed field name "Class" to "Traffic Class" and
        increased its size from 4 to 8 bits.  Decreased size of Flow
        Label field from 24 to 20 bits to compensate for increase in
        Traffic Class field.





 
RFC 2460                   IPv6 Specification              December 1998


    01) In section 4.1, restored the order of the Authentication Header
        and the ESP header, which were mistakenly swapped in the 00
        version of this memo.

    01) In section 4.4, deleted the Strict/Loose Bit Map field and the
        strict routing functionality from the Type 0 Routing header, and
        removed the restriction on number of addresses that may be
        carried in the Type 0 Routing header (was limited to 23
        addresses, because of the size of the strict/loose bit map).

    01) In section 5, changed the minimum IPv6 MTU from 576 to 1280
        octets, and added a recommendation that links with configurable
        MTU (e.g., PPP links) be configured to have an MTU of at least
        1500 octets.

    01) In section 5, deleted the requirement that a node must not send
        fragmented packets that reassemble to more than 1500 octets
        without knowledge of the destination reassembly buffer size, and
        replaced it with a recommendation that upper-layer protocols or
        applications should not do that.

    01) Replaced reference to the IPv4 Path MTU Discovery spec (RFC-
        1191) with reference to the IPv6 Path MTU Discovery spec (RFC-
        1981), and deleted the Notes at the end of section 5 regarding
        Path MTU Discovery, since those details are now covered by RFC-
        1981.

    01) In section 6, deleted specification of "opportunistic" flow
        set-up, and removed all references to the 6-second maximum
        lifetime for opportunistically established flow state.

    01) In section 7, deleted the provisional description of the
        internal structure and semantics of the Traffic Class field, and
        specified that such descriptions be provided in separate
        documents.

        --------------------------------------------------------

    00) In section 4, corrected the Code value to indicate "unrecognized
        Next Header type encountered" in an ICMP Parameter Problem
        message (changed from 2 to 1).

    00) In the description of the Payload Length field in section 3, and
        of the Jumbo Payload Length field in section 4.3, made it
        clearer that extension headers are included in the payload
        length count.






 
RFC 2460                   IPv6 Specification              December 1998


    00) In section 4.1, swapped the order of the Authentication header
        and the ESP header.  (NOTE: this was a mistake, and the change
        was undone in version 01.)

    00) In section 4.2, made it clearer that options are identified by
        the full 8-bit Option Type, not by the low-order 5 bits of an
        Option Type.  Also specified that the same Option Type numbering
        space is used for both Hop-by-Hop Options and Destination
        Options headers.

    00) In section 4.4, added a sentence requiring that nodes processing
        a Routing header must send an ICMP Packet Too Big message in
        response to a packet that is too big to fit in the next hop link
        (rather than, say, performing fragmentation).

    00) Changed the name of the IPv6 Priority field to "Class", and
        replaced the previous description of Priority in section 7 with
        a description of the Class field.  Also, excluded this field
        from the set of fields that must remain the same for all packets
        in the same flow, as specified in section 6.

    00) In the pseudo-header in section 8.1, changed the name of the