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Re: [radext] Alissa Cooper's No Objection on draft-ietf-radext-coa-proxy-06: (with COMMENT)

Alan DeKok <aland@deployingradius.com> Wed, 15 August 2018 19:50 UTC

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From: Alan DeKok <aland@deployingradius.com>
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Date: Wed, 15 Aug 2018 15:50:06 -0400
Cc: Alissa Cooper <alissa@cooperw.in>, Winter Stefan <stefan.winter@restena.lu>, radext@ietf.org, The IESG <iesg@ietf.org>, draft-ietf-radext-coa-proxy@ietf.org, radext-chairs@ietf.org
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To: Eric Rescorla <ekr@rtfm.com>
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Subject: Re: [radext] Alissa Cooper's No Objection on draft-ietf-radext-coa-proxy-06: (with COMMENT)
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On Aug 15, 2018, at 3:44 PM, Eric Rescorla <ekr@rtfm.com> wrote:
> 
> On Wed, Aug 15, 2018 at 12:25 PM, Alan DeKok <aland@deployingradius.com> wrote:
> On Aug 15, 2018, at 2:33 PM, Alissa Cooper <alissa@cooperw.in> wrote:
> > S 3.3.
> > 
> >>     The new Operator-NAS-Identifier attribute is defined as follows.
> > 
> > I suggest adding the depiction of the fields and their lengths in
> > bytes, as is done in RFC 5580. I was a little confused about whether
> > the fields in the attribute are just the TLV.
> 
>   There are no fields in the Operator-NAS-Identifier attribute.  it's just an opaque blob.
> 
> I believe what Alissa means is that it's variable length and therefore must be somehow delimited.

  The encapsulating RADIUS attribute header has a "Length" field.  That delimits the Operator-NAS-Identifier value.

  The value itself is (again) just an opaque blob.  The value can have any length, 1 to 32 octets.  There is no intrinsic meaning in any one octet of the value.

  There is no need for the *contents* of the attribute to have any delimitation whatsoever.

  Alan DeKok.

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