Re: [Cbor] I-D Action: draft-ietf-cbor-network-addresses-04.txt

Michael Richardson <mcr+ietf@sandelman.ca> Tue, 27 April 2021 10:51 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Carsten Bormann <cabo@tzi.org>, Ole Troan <otroan@employees.org>, cbor@ietf.org, 6man@ietf.org
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Subject: Re: [Cbor] I-D Action: draft-ietf-cbor-network-addresses-04.txt
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Carsten Bormann <cabo@tzi.org> wrote:
    >>> both and address and a prefix in one?
    >>
    >> I don't understand your suggestion.
    >> X - address
    >> [n,X] - prefix

    > Back in IPv4-land, we often said something like

    > “Configure the interface to 192.168.3.5/24”

Ah, oh yes.
Ole is this what you had in mind?

    > Which is a short-cut for

    > “Configure the interface to address 192.168.3.5, prefix 192.168.3.0/24”

    > Since address/prefix is structurally similar to a prefix (but uses a
    > full 32-bit address), it could be expressed by adding a third case

    <1> A - address
    <2> [n,P] - prefix
    <3> [A,n] - address/prefix

<3> is forced because case <2> demands that the trailing bits are zero, and
are ideally omitted.  If we didn't insist on that, then we could do it all
with one case.

I find the need for a third case a bit inelegant, but I can live with it.

--
Michael Richardson <mcr+IETF@sandelman.ca>   . o O ( IPv6 IøT consulting )
           Sandelman Software Works Inc, Ottawa and Worldwide