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[ntpwg] The next step of draft-ietf-ntp-checksum-trailer

Tal Mizrahi <talmi@marvell.com> Sun, 06 March 2016 08:23 UTC

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From: Tal Mizrahi <talmi@marvell.com>
To: "'ntpwg@lists.ntp.org'" <ntpwg@lists.ntp.org>, "Karen ODonoghue (odonoghue@isoc.org)" <odonoghue@isoc.org>, "Brian Haberman (brian@innovationslab.net)" <brian@innovationslab.net>, Suresh Krishnan <suresh.krishnan@ericsson.com>
Thread-Topic: The next step of draft-ietf-ntp-checksum-trailer
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Date: Sun, 06 Mar 2016 07:58:56 +0000
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Subject: [ntpwg] The next step of draft-ietf-ntp-checksum-trailer
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Hi All,

In the last few days we had two main suggestions:

(1)    Request the value 0x2005 for Checksum Complement extension fields.

(2)    Remove the requirement to have a fixed length of 28 octets.

Suggestion (1) will certainly be addressed.
There was a lot of discussion regarding (2), but it appears that there is no consensus around the suggestion to remove the 28-octet requirement.

Two important points should be made:

-          According to RFC 5905 + erratum 3627 (https://www.rfc-editor.org/errata_search.php?rfc=5905), it is not possible for the Checksum Complement extension field to be shorter than 28 octets. This restriction is further clarified in draft-ietf-ntp-extension-field. Hopefully, future updates to RFC5905 will place the MAC in its own extension field, and will allow other extension fields to be shorter than 28 octets. However, this is currently not the case.

-          The status of draft-ietf-ntp-checksum-trailer is experimental. That means that the definition of the Checksum Complement will be revised in the near future, and this revision may be an opportunity to relax the length requirement, assuming that by that time there will be a clear definition of shorter-than-28-octets extension fields.

Therefore, I would like to suggest to  leave the 28-octet length requirement as-is.

Comments will be welcome.
Thanks,
Tal.


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