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Re: [v6ops] [Last-Call] Tsvart last call review of draft-ietf-v6ops-ipv6-ehs-packet-drops-05

Joseph Touch <touch@strayalpha.com> Wed, 24 February 2021 17:28 UTC

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From: Joseph Touch <touch@strayalpha.com>
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Date: Wed, 24 Feb 2021 09:28:43 -0800
Cc: Fernando Gont <fgont@si6networks.com>, Gorry Fairhurst <gorry@erg.abdn.ac.uk>, IPv6 Operations <v6ops@ietf.org>, draft-ietf-v6ops-ipv6-ehs-packet-drops.all@ietf.org, Mark Smith <markzzzsmith@gmail.com>, Last Call <last-call@ietf.org>, tsv-art@ietf.org
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To: Tom Herbert <tom@herbertland.com>
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Subject: Re: [v6ops] [Last-Call] Tsvart last call review of draft-ietf-v6ops-ipv6-ehs-packet-drops-05
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> On Feb 24, 2021, at 9:01 AM, Tom Herbert <tom@herbertland.com> wrote:
> 
>> Your example is a good one, and has indeed two parts:
>> 
>>    "If you aren't careful with a knife, you could cut yourself"
>> 
>> This is a *fact* and I don't think there's much room for debate around it.
>> 
>> 
>>   "(so be careful with a knife)"
>> 
>> *This* is advice.
>> 
>> 
>> Our document contains the former (a fact), but not the later (advice).
>> 
> Fernando,
> 
> The analogy doesn't hold here because unlike knives, extension headers
> are not inherently dangerous

Right, and any recommendation should even avoid “3 EHs are OK but 4 are not”.

The answer is that the longer the EH, the higher the risk, but any fixed limit to EHs needs to be done as a standards-track update to IPv6.

This sort of “warning about how people do it” stuff has to be tempered with the fact that this is a snapshot in time.

Joe

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