Re: [netconf] [Technical Errata Reported] RFC8572 (6685)

[[e-mail]]

Hi,

To clarify, is the errata meant to permit the configuration of multiple, comma separated bootstrap server URIs in a single entry for uri-data?

If so, the intended function is to have one URI entry per uri-data entry (containing URI-length and the associated URI). Multiple instances of uri-data entry are permitted. I think the text describes this adequately as does the reference to RFC7227. From section 8.3:


“Both of the DHCPv4 and DHCPv6 options defined in this section encode

   a list of bootstrap server URIs.  The "URI" structure is a DHCP option that can contain multiple URIs (see [RFC7227], Section 5.7<https://datatracker.ietf.org/doc/html/rfc7227#section-5.7>).
   Each URI entry in the bootstrap-server-list is structured as follows:”

They could be represented in the DHCP server’s configuration via a comma separated list, but in the DHCP option sent to the client they need to be formatted as separate uri-data entries.

I’m unsure about the relevance of Note: “Most DHCP servers can only be configured with ASCII strings for options”

The URI encoding scheme is defined by RFC3986, which only permits ASCII.

Thanks,
Ian

From: RFC Errata System <[e-mail]>
Date: Tuesday, 14. September 2021 at 13:25
To: [e-mail] <[e-mail]>, Farrer, Ian <[e-mail]>, [e-mail] <[e-mail]>, [e-mail] <[e-mail]>, [e-mail] <[e-mail]>, [e-mail] <[e-mail]>, [e-mail] <[e-mail]>
Cc: [e-mail] <[e-mail]>, [e-mail] <[e-mail]>, [e-mail] <[e-mail]>
Subject: [Technical Errata Reported] RFC8572 (6685)
The following errata report has been submitted for RFC8572,
"Secure Zero Touch Provisioning (SZTP)".

--------------------------------------
You may review the report below and at:
https://www.rfc-editor.org/errata/eid6685

--------------------------------------
Type: Technical
Reported by: Alex Krichevsky <[e-mail]>

Section: 8.3

Original Text
-------------
   Each URI entry in the bootstrap-server-list is structured as follows:

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-...-+-+-+-+-+-+-+
    |       uri-length              |          URI                  |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-...-+-+-+-+-+-+-+

    * uri-length: 2 octets long; specifies the length of the URI data.
    * URI: URI of the SZTP bootstrap server.

Corrected Text
--------------
Multiple URI entries can be specified in a comma-separated list.

Notes
-----
Most of DHCP servers can be configured only with ASCII string for options.

Instructions:
-------------
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--------------------------------------
RFC8572 (draft-ietf-netconf-zerotouch-29)
--------------------------------------
Title               : Secure Zero Touch Provisioning (SZTP)
Publication Date    : April 2019
Author(s)           : K. Watsen, I. Farrer, M. Abrahamsson
Category            : PROPOSED STANDARD
Source              : Network Configuration
Area                : Operations and Management
Stream              : IETF
Verifying Party     : IESG