Thanks for your continued attention to this work, Alan.  Your insight is very 
much appreciated.</chair>

As an contributor, I rather like the simpler TLS encap over T+ approach 
described in the tls13 draft.  I’d personally not over-engineer something that 
isn’t immediately required.  T+ has been around for a while and is heavily 
used.  I don’t know that we need to spend time adding extensibility.

Joe

From: OPSAWG <[email protected]> on behalf of Alan DeKok 
<[email protected]>
Date: Wednesday, June 29, 2022 at 17:34
To: heasley <[email protected]>
Cc: [email protected] <[email protected]>, Douglas Gash (dcmgash) 
<[email protected]>, Andrej Ota <[email protected]>, Thorsten Dahm 
<[email protected]>
Subject: Re: [OPSAWG] I-D Action: draft-dahm-opsawg-tacacs-security-00.txt
On Jun 29, 2022, at 2:26 PM, heasley <[email protected]> wrote:
> We have received no comments about this draft, which I presume means no
> technical objections exist.  So, I would like to ask the Chairs for an
> adoption call.

  I would suggest that ~3 weeks is a little too short a time frame to claim 
that there are no objections.   I'll point to the previous TACACS+ document, 
where there were multiple reviews which got addressed by the authors many 
months later.

  I'll also point to my earlier review of draft-dahm-tacacs-tls13-00.txt, where 
I had concerns with extending the 1990s style TACACS+ packet format.  The same 
concerns apply here.

  If we're going to extend TACACS+ by adding major new features, I would 
suggest that it's a priority to design these features correctly, the first 
time.  Experience shows that it is extremely difficult to extend fixed-field 
packet formats.  It's almost always better to use an extensible format, as with 
DHCPv4, DHCPv4, DNS options, YANG, RADIUS, Diameter, etc.

  Using a format with fixed fields now makes it more difficult to extend 
TACACS+ in the future.  There will just be one complex format added after 
another.  The alternative is instead to define an extensible format, in which 
case new extensions become trivial.

  Alan DeKok.



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