Please excuse me for butting in - I'm a long time lurker on this list.
On Wed, Feb 12, 2003 at 05:16:21PM +0100, Gert Doering wrote:
but there is no need for a /64 here. => there is no choice in the standard: all prefixes on a link are /64s.
Please quote the RFC that *mandates* /64s for all links. As far as I remember, it's a SHOULD for multiaccess links, and voluntary for ptp links.
OK, I stand corrected, RFC 2373 actually doesn't differenciate between multiaccess and point-to-point links, and requires /64s on every single link (section 2.4 and 2.5.1).
--- snip --- In a number of the format prefixes (see section 2.4) Interface IDs are required to be 64 bits long and to be constructed in IEEE EUI-64 format [EUI64]. --- snip ---
It's an odd feature of that RFC that it's published as Informational rather then Proposed Standard, and the only reference to the RFC 2119 terms "MUST", "MUST NOT" etc. is in the Introduction. It specifically does not say: "Interface IDs are REQUIRED to be 64 bits long and to be constructed in IEEE EUI-64 format [EUI64]." Perhaps someone who is further into the the IETF process can say whether this was an oversight or if the latitude was intended. Sam Wilson Infrastructure Services Division Computing Services, The University of Edinburgh Edinburgh, Scotland, UK