[NCAP-Discuss] Defining CI/CE

[Jeff Schmidt]

I wasn't clear in my note.

There is a discussion to be had for both TCP and UDP on this. Do we optimize for the "fast fail" by sending RST and Unreachables respectively, or do we emulate likely current behavior (i.e. "(maybe) cause less damage") by dropping with no response (except for the few ports we do respond on)? Open question.

Funny thing is that our decision here will have an impact on the metrics collected. Most things (I'm thinking about the Microsoft stuff I'm unfortunately very familiar with) retry... some aggressively. So the speed and modality of failure will impact the metrics.

Implementation details matter.

Thx,
Jeff


> -----Original Message-----
> From: NCAP-Discuss <ncap-discuss-bounces at icann.org> On Behalf Of Jeff
> Schmidt via NCAP-Discuss
> Sent: Wednesday, November 9, 2022 4:26 PM
> To: Casey Deccio <casey at deccio.net>; ncap-discuss at icann.org
> Subject: Re: [NCAP-Discuss] Defining CI/CE
> 
> > the comparison doc proposes suggests that UDP is responded to with ICMP
> port unreachable for "quick response" rather than dropping.
> 
> This is why I'm happy we're getting to this level of technical detail. If we send
> back ICMP unreachables, yes that may generate "quick fails" if they are
> actually received, but that would also very likely be a change in behavior from
> the client perspective as currently they're very likely getting no response to
> whatever they send. Plusses and minuses to both.
> 
> Thx,
> Jeff
> 
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