Re: [tsvwg] Comments on draft-ietf-tsvwg-transport-encrypt-14

Joseph Touch <touch@strayalpha.com> Mon, 06 April 2020 15:00 UTC

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From: Joseph Touch <touch@strayalpha.com>
In-Reply-To: <fc94ff59-4972-3960-7c25-85f8953463f9@erg.abdn.ac.uk>
Date: Mon, 6 Apr 2020 08:00:00 -0700
Cc: "Black, David" <David.Black@dell.com>, tsvwg <tsvwg@ietf.org>
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To: Gorry Fairhurst <gorry@erg.abdn.ac.uk>
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Subject: Re: [tsvwg] Comments on draft-ietf-tsvwg-transport-encrypt-14
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Notes below...

> On Apr 6, 2020, at 3:23 AM, Gorry Fairhurst <gorry@erg.abdn.ac.uk> wrote:
> On 05/04/2020 23:50, Joseph Touch wrote:
>> 
>> 
>>> On Apr 5, 2020, at 3:32 PM, Black, David <David.Black@dell.com <mailto:David.Black@dell.com>> wrote:
>>> 
>>> ...
>>> ...
>>> OLD
>>>    UDP-based protocols often do not use well-known port numbers.  
>>> NEW
>>>    UDP-based protocols often do not use well-known port numbers,
>>>    and use of a well-known port number is not limited to the
>>>    protocol for which the port is well known [RFC7605].
>> 
>> RFC7605 doesn’t say this, or at least most of this.
>> 
>> Yes, there’s no rule that well-known port numbers are used. But that’s not either unique to nor biased towards UDP vs TCP.
>> 
>> Joe
> I understand, I think we can mention RFC7605 in 3.1.1 by adding this to the para about ports to read something like:
> 
> "In some uses, an assigned transport port (e.g., low-numbered port)
> 
(e.g., 0..49151)

[I would avoid the term ‘low-numbered’, which could be interpreted as meaning 0–1023]

>  identify the protocol [RFC7605]. However, port information alone is not sufficient to guarantee identification. Applications can use arbitrary ports and do not need to use well-known port numbers. The use of a well-known port number is also not limited to the protocol for which the port is well known. 
> 
Well-known often implies System.

As per RF7605, I’d encourage the use of “assigned” for the entire range from 0..49151.

Joe