On 12 Dec 2012, at 12:14 , Rémi Després wrote: > In any case, IIDs for multicast addresses are out of scope for the IPv6 > addressing architecture of RFC 4291.
Disagree. It is clear that RFC-4291 has reserved the use of G==U==1 for multicast identifiers. > An important point to be noted is that, in the translation direction > from EUI-64 of IEEE to modified EUI-64 of IETF, the proposed format > implies no change at all. It *breaks* the reverse mapping, however, whereas today the *bi-directional* mapping works reliably. > In other words, reserving a /8 IID prefix for 4rd (and possibly > some others for new types of unicast addresses) won't prevent > from using IEEE-based IIDs with u=g=1 for multicast. Incorrect. As a trivial example, one can use a unicast routing prefix to specify an RP location, along with a multicast group-id (so that the RP knows to multicast RPF the packet). This has the potential to reduce the state required in inter-domain routers, to give an example of why this approach can be useful. > Reasons why a new format is used for 4rd have been extensively > discussed in Softwire. If you are really interested, > we can continue, but offline. Those reasons are directly relevant to the 6MAN WG decision about this proposal, so those reasons need to be articulated here, on-list. Softwire and 6MAN are different WGs. IETF rules do not assume every member of one WG also belongs to a different WG. > Where 6man has to be involved is to conclude whether the new > IID format is an acceptable new usage of the openness of > RFC 4291 to new unicast-address technologies, > and if not to explain why. The language you keep quoting was inserted to leave the door open for GSE/8+8. Please don't twist the words to try to justify something that the text really does not support. Further, under IETF rules, the burden of proof/justification is entirely on the folks advocating change to the IPv6 specs, NOT on the 6MAN WG. Yours, Ran -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
