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Re: (IPng 5744) Re: [Karen Seo: Thomas Narten -- clarification, etc.]



There's something sour in the infosoup.

I think SOME people are confusing (Extension Headers) with
(Hop-by-hop Options and Destination options).

IPv6 Extensions headers have a protocol number assigned from the same
8-bit space as IPv4 protocol numbers (although some values will only
be seen in an IPv4 packet, and some only in an IPv6 packet).

HBH options and destination options are carried in a HBH option
extension header or a destination option extension header,
respectively.  Each option carried has its own 8-bit type code which
uses 2 bits to encode the action to be taken when the option is not
understood and one bit to declare whether it's to be covered by AH.

A receiver "should" reject a packet if it is called upon to process
any unknown extension header.

An packet with an unknown (HBH or Destination) option, on the other
hand, is handled in accordance with the two bit field referred to
above.  (See page 9 of ..ipv6-spec-v2-01.)

				Matt