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Re: [netmod] 6021 ipv4-prefix

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Thu, 18 April 2019 11:12 UTC

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Date: Thu, 18 Apr 2019 13:12:41 +0200
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: Mikael Abrahamsson <swmike@swm.pp.se>
CC: netmod@ietf.org
Message-ID: <20190418111241.5csf5kkgwgxwtsnm@anna.jacobs.jacobs-university.de>
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References: <003301d4f498$4f593640$ee0ba2c0$@gmail.com> <alpine.DEB.2.20.1904180906360.3490@uplift.swm.pp.se> <20190418080643.gcdi5x4dtn64adwc@anna.jacobs.jacobs-university.de> <alpine.DEB.2.20.1904181128480.3490@uplift.swm.pp.se> <20190418102604.y5wyqflcudiywj2i@anna.jacobs.jacobs-university.de> <alpine.DEB.2.20.1904181251000.3490@uplift.swm.pp.se>
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Subject: Re: [netmod] 6021 ipv4-prefix
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On Thu, Apr 18, 2019 at 12:53:22PM +0200, Mikael Abrahamsson wrote:
> On Thu, 18 Apr 2019, Juergen Schoenwaelder wrote:
> 
> > On Thu, Apr 18, 2019 at 11:43:05AM +0200, Mikael Abrahamsson wrote:
> > 
> > > 2001:db8::/64 and 2001:db8::1/64 are NOT the same if you use them.
> > 
> > Why are they not the same if you define a prefix?
> 
> Because they're not. One of them is a valid prefix, the other one isn't.

Well, this has gone twice through WG last call and twice through IESG
review plus several directorate reviews. In the canonical format, the
non-prefix bits are all zero. I fail to see why this is now a problem.

> > +17.4 is not an integer, so this is an error (not because of the + but
> > because of the . followed by additional digits). +17 is I think a valid
> > integer value but the + will be dropped in the canonical representation.
> 
> Yes, but 2001:db8::1/64 isn't valid prefix (because the host portion of the
> prefix isn't 0) so why should it be "rounded" when 17.4 shouldn't be rounded
> if an integer input is expected?

The non-prefix bits are irrelevant for the prefix and the canonical
format has the non-prefix bits all set to zero. I understand that you
prefer 2001:db8::1/64 to be an error but RFC 6021 and RFC 6991
consider this as valid input that can be safely interpreted to mean
2001:db8::0/64.

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
Fax:   +49 421 200 3103         <https://www.jacobs-university.de/>

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