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RFC 4919, "IPv6 over Low-Power Wireless Personal Area Networks (6LoWPANs): Overview, Assumptions, Problem Statement, and Goals", August 2007

Source of RFC: 6lowpan (int)
See Also: RFC 4919 w/ inline errata

Errata ID: 1789
Status: Verified
Type: Technical
Publication Format(s) : TEXT

Reported By: Jeffrey Wildman
Date Reported: 2009-06-01
Verifier Name: Ralph Droms
Date Verified: 2013-03-10

Section 5. Goals says:

   1.  Fragmentation and Reassembly layer: As mentioned in the overview,
       the protocol data units may be as small as 81 bytes.  This is
       obviously far below the minimum IPv6 packet size of 1280 octets,
       and in keeping with Section 5 of the IPv6 specification
       [RFC2460], a fragmentation and reassembly adaptation layer must
       be provided at the layer below IP.

It should say:

   1.  Fragmentation and Reassembly layer: As mentioned in the overview,
       the payload of medium access layer frames may be capped in size (as small 
       as 81 bytes).  This is obviously far below the minimum IPv6 Maximum 
       Transmission Unit (MTU) size of 1280 octets, and in keeping with Section 5 
       of the IPv6 specification [RFC2460], a fragmentation and reassembly 
       adaptation layer must be provided at the layer below IP.

Notes:

Changed 'protocol data units' to 'medium access layer frames' for clarity.

Changed 'may be as small as 81 bytes' to 'may be capped in size (as small as 81 bytes)'. We are highlighting the fact that link layer payloads can't exceed some size X, while we are also expecting IPv6 packets much larger than X bytes to be pushed down to the link layer. (Hence the requirement for fragmentation and reassembly mechanisms at the link layer.)

'minimum IPv6 packet size of 1280 octets' changed to 'minimum IPv6 MTU size of 1280 octets'. In the IPv6 specification [RFC 2460], Section 5 'Packet Size Issues' says that the minimum allowable IPv6 MTU is 1280 octets. This is not equivalent to saying that the minimum IPv6 packet size is 1280 bytes (as suggested in the original text in RFC 4919).

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