Re: [Ntp] Éric Vyncke's No Objection on draft-ietf-ntp-interleaved-modes-05: (with COMMENT)

"Eric Vyncke (evyncke)" <evyncke@cisco.com> Mon, 28 June 2021 14:54 UTC

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From: "Eric Vyncke (evyncke)" <evyncke@cisco.com>
To: Miroslav Lichvar <mlichvar@redhat.com>
CC: The IESG <iesg@ietf.org>, "draft-ietf-ntp-interleaved-modes@ietf.org" <draft-ietf-ntp-interleaved-modes@ietf.org>, "ntp-chairs@ietf.org" <ntp-chairs@ietf.org>, "ntp@ietf.org" <ntp@ietf.org>, "odonoghue@isoc.org" <odonoghue@isoc.org>
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Date: Mon, 28 Jun 2021 14:53:58 +0000
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Subject: Re: [Ntp] =?utf-8?q?=C3=89ric_Vyncke=27s_No_Objection_on_draft-ietf-?= =?utf-8?q?ntp-interleaved-modes-05=3A_=28with_COMMENT=29?=
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Miroslav

Thank you for the quick reply. Please see in-line for EV>

NB: all my comments are non blocking

Regards

-éric

-----Original Message-----
From: Miroslav Lichvar <mlichvar@redhat.com>
Date: Monday, 28 June 2021 at 16:12
To: Eric Vyncke <evyncke@cisco.com>
Cc: The IESG <iesg@ietf.org>rg>, "draft-ietf-ntp-interleaved-modes@ietf.org" <draft-ietf-ntp-interleaved-modes@ietf.org>rg>, "ntp-chairs@ietf.org" <ntp-chairs@ietf.org>rg>, "ntp@ietf.org" <ntp@ietf.org>rg>, "odonoghue@isoc.org" <odonoghue@isoc.org>
Subject: Re: Éric Vyncke's No Objection on draft-ietf-ntp-interleaved-modes-05: (with COMMENT)

    On Mon, Jun 28, 2021 at 04:07:51AM -0700, Éric Vyncke via Datatracker wrote:
    > Éric Vyncke has entered the following ballot position for
    > draft-ietf-ntp-interleaved-modes-05: No Objection

    Thanks for the review.

    > -- Section 2 --
    > "  The server MAY separate the timestamps
    >    by IP addresses, but it SHOULD NOT separate them by port numbers,
    >    i.e.  clients are allowed to change their source port between
    >    requests."
    > With draft-ietf-ntp-port-randomization in mind, please change the "clients are
    > allowed" into "clients are recommended to"

    If I didn't miss an update in the recent changes of the draft, the
    port-randomization draft still leaves that per-request or
    per-association decision to the implementation with no preference, so
    I think they can but are not recommended to change the port between
    requests.

EV> this is also what I remember when  read the I-D several weeks ago. But, I still think that "are allowed" is perhaps too light.

    > "  Both servers and clients that support the interleaved mode MUST NOT
    >    send a packet that has a transmit timestamp equal to the receive
    >    timestamp"
    > Will it always be possible to comply with the above "MUST NOT" ?

    I think it will. If the timestamps happen to be equal, one of the
    timestamps can simply be adjusted by 1 before the transmission. That's
    ~1/4 of nanosecond, well hidden in the typical precision of an NTP
    clock.

EV> I agree with the cure (and its minor effect) but then why not adding this text in the I-D ?

    -- 
    Miroslav Lichvar