On Wed, 5 Sep 2001, Emmanuel Varagnat wrote:
> Pekka Savola wrote:
> >
> > Your confusion may be based on the difference that in IPv4, routers also
> > may fragment packets. IPv6 fragmentation is end-to-end, and you either
> > use minimum MTU 1280, or implement Path MTU Discovery (above).
>
> This makes me think about something strange in Path MTU Discovery.
>
> A note in the section 4 of Path MTU Discovery for IPv6 (RFC1981) say:
> "A node may receive a Packet Too Big message reporting a
> next-hop MTU that is less than the IPv6 minimum link MTU. In that
> case, the node is not required to reduce the size of subsequent
> packets sent on the path to less than the IPv6 minimun link MTU,
> but rather must include a Fragment header in those packets [IPv6-
> SPEC]."
>
> Does this can cause problems with the IPv6 standard that specify that
> under 1280 octets, the layer below IPv6 must deal with the
> fragmentation ?
Yes, or use Fragmentation Header for every too big packet.
(as far as I can see :-)
--
Pekka Savola "Tell me of difficulties surmounted,
Netcore Oy not those you stumble over and fall"
Systems. Networks. Security. -- Robert Jordan: A Crown of Swords
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