Re: [tcpm] Zaheduzzaman Sarker's Discuss on draft-ietf-tcpm-yang-tcp-07: (with DISCUSS and COMMENT)

["Scharf, Michael" <[e-mail]>]

Below...

> -----Original Message-----
> From: Zaheduzzaman Sarker <[e-mail]>
> Sent: Monday, September 5, 2022 4:19 PM
> To: Scharf, Michael <[e-mail]>; The IESG
> <[e-mail]>
> Cc: [e-mail]; [e-mail]; [e-mail];
> [e-mail]
> Subject: RE: Zaheduzzaman Sarker's Discuss on draft-ietf-tcpm-yang-tcp-07:
> (with DISCUSS and COMMENT)
> 
> 
> 
> -----Original Message-----
> From: Scharf, Michael <[e-mail]>
> Sent: den 5 september 2022 16:16
> To: Zaheduzzaman Sarker <[e-mail]>; The IESG
> <[e-mail]>
> Cc: [e-mail]; [e-mail]; [e-mail];
> [e-mail]
> Subject: RE: Zaheduzzaman Sarker's Discuss on draft-ietf-tcpm-yang-tcp-07:
> (with DISCUSS and COMMENT)
> 
> Hi Zahed,
> 
> Follow-up...
> 
> > > --------------------------------------------------------------------
> > > --
> > > COMMENT:
> > > --------------------------------------------------------------------
> > > --
> > >
> > >
> > > I have some minor observations, which we might want to address -
> > >
> > > - Section 3.1 : It is not clear to me what is the difference between
> > > a "Global configuration" and "Policies". To me policies can include
> > > global configurations that will valid for all the TCP sessions. So,
> > > it is not clear is policy is a special case of global configuration or vise verse.
> > Also the term "Global"
> > > here seems ambiguous. I kind of read that as a global variable
> > > definition, still the text need to be clear about the scope of
> > > "Global" is self, global to what context?
> >
> > Agreed, this terminology may not be perfect. In particular, the term
> "policy"
> > can mean many things. The proposal is to avoid it with the following
> > new
> > terms:
> >
> > *  System-wide configuration
> >
> > *  Interface configuration
> >
> > *  Connection parameters
> >
> > *  Application preferences
> >
> > I hope that this better captures the different cases.
> >
> > [ZS] System-wide configuration a bit more clear than Global. I was
> > thinking if it is work clarifying the scope of the "System", is this the local
> host only?
> >
> > Application preferences is good.
> 
> I can see your point. But as this document is mostly relevant for TCP stack on
> routers (and similar network elements inside the network), the term "host"
> may be confusing.
> 
> I am looking for a good term for "not-interface-specific". Unfortunately, I
> haven't found something better than "system-wide", but I am open for
> other suggestions.
> 
> If we don't find another term, I'd probably add a sentence in -09 to better
> describe the meaning in this specific context.
> 
> [ZS] sounds like a good plan. Thanks!!

For what it is worth, my current proposed wording planned for -09 is:

            System-wide configuration: Many TCP implementations have
            configuration parameters that affect all TCP
            connections from or to this TCP stack. Typical examples include
            enabling or disabling optional protocol features. For instance,
            many implementations can turn on or off use of window scaling
            [RFC9293] for all TCP connections.

Michael