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Re: [dhcwg] I-D Action: draft-ietf-dhc-addr-notification-08.txt

Jen Linkova <furry13@gmail.com> Mon, 22 January 2024 13:11 UTC

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From: Jen Linkova <furry13@gmail.com>
Date: Mon, 22 Jan 2024 14:11:11 +0100
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To: Lorenzo Colitti <lorenzo@google.com>
Cc: Michael Richardson <mcr+ietf@sandelman.ca>, dhcwg@ietf.org
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Subject: Re: [dhcwg] I-D Action: draft-ietf-dhc-addr-notification-08.txt
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On Fri, Jan 19, 2024 at 4:43 AM Lorenzo Colitti <lorenzo@google.com> wrote:
> On Thu, Jan 18, 2024 at 2:13 AM Michael Richardson <mcr+ietf@sandelman.ca> wrote:
>>
>>
>> }           If revealing other hosts addresses and
>> }          alllowing onlink peer-to-peer communication is undesirable for a
>> }          given network segment, then layer2 (link-layer) isolation shall be
>> }          used.
>>
>> I think you'll get a BCP14 query on "shall" here from the IESG.
>> (And I hate putting BCP14 into Security Considerations, so upcasing that
>> would not be my choice)
>
>
> Any reason not to just say MUST here? I think it's pretty straightforward. This mechanism relies on hosts multicasting their own addresses. If you have a problem with hosts seeing each other's addresses, then you MUST ensure that that happens at layer 2?

I think it can be rephrased w/o using normative language.
How about:
"Layer2 (link-layer) isolation allows to mitigate this threat by
blocking onlink peer-to-peer communication between hosts."

-- 
Cheers, Jen Linkova

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