> From: Brian Haberman [mailto:[EMAIL PROTECTED]] > >> The more I think about it, the more I realize that "automagically" > >> creating the subnet-local scope zone id isn't going to work. > >> Especially with multiple prefixes per interface.
Why not? Can you elaborate? Shouldn't it always be true that if any two interfaces have the same (non-link-local) subnet prefix, then their subnet-local zone id MUST be the same? > > So, this would be consistent with the suggestion that we > > change the Addr Arch document to list subnet-local and larger > > scopes as administratively defined (instead of just admin-local > > and higher)? > > Yes. Given the issues with magically setting the subnet-local > zone id when multiple prefixes are enabled on an interface I > would agree with that change. I would disagree with that change. > > Another possibility is that we could default to a non-multi-link > > subnet case and declare the default to be subnet-local scope > > == link-local scope. > > We may need this as well. Typically, the default behavior for > any less than global scope zone id is that all interfaces are > in the same zone. I don't think we want that behavior with > subnet-local, it should default to being equivalent to link-local. I agree. This also is what we implemented. > >>> In other words, I think that routers should default to the > >>> single-link subnet case, unless mutli-link subnetting has been > >>> explicitly configured. I agree with one important clarification. "Explicitly configured" != "administratively configured". The zero-config counter argument is a box that is labeled as having its default configuration be that interfaces are on the same subnet different but different links (e.g. guaranteed to be different because they're different media, like an 802.11 access point with a wired Ethernet link). Here the explicitly configuration was done by the factory, not by the admin. -Dave -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] --------------------------------------------------------------------
