Re: [ippm] Alissa Cooper's Discuss on draft-ietf-ippm-checksum-trailer-05: (with DISCUSS)

Tal Mizrahi <talmi@marvell.com> Wed, 03 February 2016 07:14 UTC

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From: Tal Mizrahi <talmi@marvell.com>
To: "MORTON, ALFRED C (AL)" <acmorton@att.com>, Alissa Cooper <alissa@cooperw.in>, The IESG <iesg@ietf.org>
Thread-Topic: Alissa Cooper's Discuss on draft-ietf-ippm-checksum-trailer-05: (with DISCUSS)
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Date: Wed, 03 Feb 2016 07:14:38 +0000
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Cc: "ippm-chairs@ietf.org" <ippm-chairs@ietf.org>, "draft-ietf-ippm-checksum-trailer@ietf.org" <draft-ietf-ippm-checksum-trailer@ietf.org>, "ippm@ietf.org" <ippm@ietf.org>
Subject: Re: [ippm] Alissa Cooper's Discuss on draft-ietf-ippm-checksum-trailer-05: (with DISCUSS)
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Agreed.

Best regards,
Tal.

>-----Original Message-----
>From: MORTON, ALFRED C (AL) [mailto:acmorton@att.com]
>Sent: Tuesday, February 02, 2016 9:37 PM
>To: Alissa Cooper; The IESG
>Cc: draft-ietf-ippm-checksum-trailer@ietf.org; ippm-chairs@ietf.org;
>ippm@ietf.org
>Subject: RE: Alissa Cooper's Discuss on draft-ietf-ippm-checksum-trailer-05:
>(with DISCUSS)
>
>I think you're right Alissa, the text in 3.2 should be made consistent and
>mention that authenticated mode is allowed.
>
>ok Tal?
>Al
>
>> -----Original Message-----
>> From: Alissa Cooper [mailto:alissa@cooperw.in]
>...
>>
>> The document, along with other ballot positions, can be found here:
>> https://datatracker.ietf.org/doc/draft-ietf-ippm-checksum-trailer/
>>
>> ----------------------------------------------------------------------
>> DISCUSS:
>> ----------------------------------------------------------------------
>>
>> There seems to be a bit of a disconnect between this text in 3.2:
>>
>> "As specified in Section 3.4. , the Checksum Complement should only be
>> used in unauthenticated mode."
>>
>> and this text in 3.4.1:
>>
>> "A Checksum Complement MAY be used when authentication is enabled. In
>>    this case an intermediate entity can timestamp test packets and
>>    update their Checksum Complement field without modifying the HMAC."
>>
>> I can see why not to use the checksum complement in encrypted mode,
>> but don't see why it can't be used in authenticated mode for TWAMP.
>>
>>
>>