Erik's draft doesn't require a two-faced DNS. If I recall correctly, you
simply don't use the site-local addresses unless you recognize the global
prefix as being in your site (which you know from site-prefix
advertisements).
--Brian
> -----Original Message-----
> From: Brian E Carpenter [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, 07 February, 2001 11:30
> To: [EMAIL PROTECTED]
> Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED]
> Subject: Re: another renumbering question
>
>
> I didn't mean to say it is required. But I think it is so
> common these days that
> it's fair to regard it as normal for large intranets.
>
> Brian
>
> [EMAIL PROTECTED] wrote:
> >
> > I disagree that we can assume any site will have two face
> DNS. Thats a bad
> > assumption.
> > /jim
> >
> > > -----Original Message-----
> > > From: ext Brian E Carpenter [mailto:[EMAIL PROTECTED]]
> > > Sent: Wednesday,February 07,2001 10:19 AM
> > > To: Robert Elz
> > > Cc: Paul Francis; [EMAIL PROTECTED]
> > > Subject: Re: another renumbering question
> > >
> > >
> > > Once you *know* that a host has a site local address, the
> > > address selection draft tells you when to use it. I've always
> > > assumed that they would be in the DNS along with global addresses.
> > > Presumably large sites will be running two-faced DNS anyway, so
> > > these addresses will never go outside.
> > >
> > > Brian
> > >
> > > Robert Elz wrote:
> > > >
> > > > Date: Tue, 6 Feb 2001 16:24:23 -0800
> > > > From: "Paul Francis" <[EMAIL PROTECTED]>
> > > > Message-ID: <006b01c0909c$528dda60$1300a8c0@dellchan>
> > > >
> > > > | But I can't recall how it is a host decides when
> > > another host can be reached
> > > > | via a site-local address, nor can I find where I
> read that text.
> > > >
> > > > This is still one of life's mysteries I think - several
> ideas have
> > > > been floated, but nothing yet committed to a draft that I'm
> > > aware of.
> > > >
> > > > The include placing the site locals in the DNS, and
> having clients
> > > > do a match on the global addresses to see if the site
> local should
> > > > refer to the same site (one that finds no attraction to
> me at all).
> > > >
> > > > And having the client send from its site local addr (so the
> > > packet cannot
> > > > leave the site) to the remote global addr an ICMP saying
> > > "tell me your
> > > > addresses", and receiving a list that includes the site
> > > locals for the
> > > > destination (or receiving an ICMP error indicating an
> > > attempt to cross
> > > > the site boundary with a site local source addr). (If the
> > > source doesn't
> > > > have, or doesn't want to use, its site local addr, then
> > > there's no point
> > > > doing any of this, may as well just use global addr of the
> > > dest a well).
> > > > This one I like - it adds a small delay in communications
> > > the first time
> > > > a connection is attempted to a new node (only for
> > > connections initiated,
> > > > responses would never do this) but that is bounded by the
> > > RTT to the edge
> > > > of the site, which is usually of the order of a couple of ms.
> > > >
> > > > kre
> > > >
> > > >
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