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Re: [Idr] [BULK] Benjamin Kaduk's Discuss on draft-ietf-idr-flow-spec-v6-19: (with DISCUSS and COMMENT)

Robert Raszuk <robert@raszuk.net> Mon, 16 November 2020 10:13 UTC

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In-Reply-To: <A7DA0A78-228D-4D76-80E1-7FEC6525804D@tix.at>
From: Robert Raszuk <robert@raszuk.net>
Date: Mon, 16 Nov 2020 11:12:48 +0100
Message-ID: <CAOj+MMFEguogffSvK+a2SSMtf0ePdme4nBjepuqRXUTx2RiN3Q@mail.gmail.com>
To: Christoph Loibl <c@tix.at>
Cc: Jeffrey Haas <jhaas@pfrc.org>, Benjamin Kaduk <kaduk@mit.edu>, "idr@ietf. org" <idr@ietf.org>, draft-ietf-idr-flow-spec-v6@ietf.org, idr-chairs@ietf.org, The IESG <iesg@ietf.org>, Erik Kline <ek.ietf@gmail.com>
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Subject: Re: [Idr] [BULK] Benjamin Kaduk's Discuss on draft-ietf-idr-flow-spec-v6-19: (with DISCUSS and COMMENT)
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Hi,

I think Jeff is asking what if the length in numeric-op is different then
"10" meaning 4 octets say it is sent with "01"?

"Type 13 component values SHOULD be encoded as 4-octet quantities
(numeric_op len=10)."

It seems this is exactly what his implementation will do today.

It looks to me on the surface as this "SHOULD" is while not a MUST it still
does not allow flexibility to send only what is needed as it was seen as
encouraging manual flow label allocation.

So with current text I am not sure if some implementations may not claim
RFC violation when they see Junos sending shorter numeric_op length.

Thx,
R.










On Mon, Nov 16, 2020 at 10:59 AM Christoph Loibl <c@tix.at> wrote:

> Hi,
>
> On 16.11.2020, at 10:42, Jeffrey Haas <jhaas@pfrc.org> wrote:
>
> Remind me, is there procedure handling improper values for the length of
> the
> component semantics?
>
> E.g. ports can only be 2 bytes of value.
>
> I have a feeling this is in the base procedures of "this can't match, so
> it's not a problem" but I'm not finding it right now.
>
>
> In case of the port component, the numeric operator does lt, gt, eq
> comparisons between the port in the packet and the value followed by the
> operator. This is independent on the encoding. Only that the port can never
> exceed the 16bit boundary. While the value from the operator technically
> can and will, depending on the operator (gt,lt,eq), even match packets.
>
> Cheers Christoph
>
> --
> Christoph Loibl
> c@tix.at | CL8-RIPE | PGP-Key-ID: 0x4B2C0055 | http://www.nextlayer.at
>
>
>
>
>

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