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From: "Rodney W. Grimes" <freebsd@gndrsh.dnsmgr.net>
Message-Id: <202005180155.04I1tUtV098551@gndrsh.dnsmgr.net>
Subject: Re: svn commit: r361143 - head/release/tools
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To: Ed Maste <emaste@freebsd.org>
Date: Sun, 17 May 2020 18:55:30 -0700 (PDT)
CC: Conrad Meyer <cem@freebsd.org>, Oliver Pinter <oliver.pntr@gmail.com>,
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> On Sun, 17 May 2020 at 20:24, Conrad Meyer <cem@freebsd.org> wrote:
> >
> > On Sun, May 17, 2020 at 4:49 PM Oliver Pinter <oliver.pntr@gmail.com> wrote:
> > > On Sunday, May 17, 2020, Colin Percival <cperciva@freebsd.org> wrote:
> > >> +# Provide instructions on how to mount the requested filesystem.
> > >> +FS=$1
> > >> +REGION=`fetch -qo- http://169.254.169.254/latest/meta-data/placement/availability-zone | sed -e 's/[a-z]$//'`
> > >
> > >
> > > What will be this hard-coded ip address without any verification or at least https?
> >
> > It's a special non-routable IP that is used in at least AWS and Azure
> > to provide some VM services.  Traffic to and from it never leaves the
> > virtual overlay network, which by design VM instances already trust to
> > provide privacy.  It doesn't require functioning DNS to access the raw
> > IP.
> 
> And, more information at
> https://en.wikipedia.org/wiki/Link-local_address

And the definative document(s)
https://www.rfc-editor.org/rfc/rfc3927.txt
https://who.is/whois-ip/ip-address/169.254.0.0

-- 
Rod Grimes                                                 rgrimes@freebsd.org