Hi all, indeed scoping is a pain... specifically since it is not carried as a part of the address. In any case we should give an escape path out of this ambiguity to a "known" world. Meaning if a node is configured with a global addresses the global addresses will have higher priority being used as a source address over SL. Since the IPv6 transformation is expected to be evolution(vs. revolution) I believe the vast majority of the networks will choose to take this path. I know there is a draft in the work for this, and I believe this is what it says (correct me if I am wrong...). This way the vast majority of users knows there is a way to get over this problem... This is also solves the scoping problems for LL and multihome hosts.
Shuki -----Original Message----- From: Dan Lanciani [mailto:ipng-incoming@;danlan.com] Sent: Monday, October 28, 2002 3:52 PM To: [EMAIL PROTECTED] Subject: RE: Limiting the Use of Site-Local I think it's great the folks are starting to consider the difficult problems associated with site-local addresses in particular and scoped addresses in general. In the past these have been glossed over with hand-waving arguments that scopes would ``just work'' with minimal application involvement and a little DNS magic. Before you try to solve the problems by effectively reducing scopes to a degenerate case of one and restricting site-local addresses to sites with no global addresses (or even with no external connectivity), please keep in mind that site-local addresses have been offered up as the solution to a number of other problems which themselves were difficult to hand-wave away. For example, the ability to have long-term tcp connections within a site in the face of global address renumbering has--given the lack of any protocol or application support for that renumbering--been pushed onto site-local addressing. (The problem is hardly confined to tcp, but that's the usual example cited.) Any language that reduces site-local addresses to second-class citizens (or, worse, implies that they should not be used concurrent with global addresses) will give stack and application vendors an excuse to fail to support such configurations. I don't think you want to open such a huge can of worms as it will entail revisiting every problem that has been ``resolved'' with an admonition to simply use site-local addresses. Dan Lanciani ddl@danlan.*com -------------------------------------------------------------------- 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] -------------------------------------------------------------------- -------------------------------------------------------------------- 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] --------------------------------------------------------------------
