Hi Timothy,
The deprecation of site-local addresses only applies to unicast.
The multicast scoping is still valid and used in various ways. So,
there is no need to change the site-scoped multicast address used
by DHCPv6.Regards, Brian
On Mar 9, 2005, at 9:51, timothy enos wrote:
Good morning all. I know I missed last call on ‘draft-ietf-ipv6-addr-arch-v4-01.txt’, so decided to start another thread. RFC 3315 (section 5.1) defines a site-scoped address (FF05::1:3, by which relay agents communicate with servers… either to communicate with all servers or if the unicast address of the servers is unknown). RFC 3513 (section 2.7) defines each potential value of the ‘scop’ field, with a value of ‘5’ being used to signify a multicast address with site scope, and ‘8’ being used to signify a multicast address with organization scope (spans multiple sites belonging to an organization). FWIW, it seems both of these should be removed from ‘draft-ietf-ipv6-addr-arch-v4-01.txt’.
Although RFC 3879 (section 1) does state “the formal deprecation allows existing usage of site-local addresses to continue until the replacement is standardized and implemented.”, it also acknowledges that:
- “As currently defined, site local addresses are ambiguous” (section 2)
- local address “does not contain any indication of the site to which it belongs” (section 2)
Regarding the concept of ‘site’ itself: “The current definition of scopes follows an idealized “concentric scopes” model” (section 2.5)… ultimately concluding “the current concept of site is naïve, and does not map to operational requirements”. It seems that this informs the removal of any reference to any site-scoped address, including the aforementioned one in RFC 3315 (All_DHCP_Servers). What would replace the All_DHCP-Servers multicast address in the revision of 3315 (whenever that might be), and how would said replacement impact present implementations?
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