Re: [BEHAVE] [Technical Errata Reported] RFC7050 (6270)

Magnus Westerlund <magnus.westerlund@ericsson.com> Wed, 16 September 2020 12:46 UTC

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From: Magnus Westerlund <magnus.westerlund@ericsson.com>
To: "teemu.savolainen@nokia.com" <teemu.savolainen@nokia.com>, "dwing@cisco.com" <dwing@cisco.com>, "rfc-editor@rfc-editor.org" <rfc-editor@rfc-editor.org>, "martin.h.duke@gmail.com" <martin.h.duke@gmail.com>, "dwing-ietf@fuggles.com" <dwing-ietf@fuggles.com>, "dthaler@microsoft.com" <dthaler@microsoft.com>, "jouni.nospam@gmail.com" <jouni.nospam@gmail.com>
CC: "behave@ietf.org" <behave@ietf.org>, "marka@isc.org" <marka@isc.org>
Thread-Topic: [Technical Errata Reported] RFC7050 (6270)
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Date: Wed, 16 Sep 2020 12:45:22 +0000
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Subject: Re: [BEHAVE] [Technical Errata Reported] RFC7050 (6270)
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Hi Mark and Authors,


I think this errata may be due to a missinterpretation of the example. 

Mark did you interpret that the second AAAA synthesised respond should be for
the second IPv4 address from the "A" response? My interpretation is that the
DNS64 server has chosen to provide two different synthesized AAAA responses, one
for each of its Network Specific Prefix (NSP) for the first IPv4 address. 

Please review this and if necessary clarify the argument for what is wrong in
this example.



    Node                                           DNS64 server
      |          
                                      |
      |  "AAAA" query for
"ipv4only.arpa."             |
      |-------------------------------------------
---->|"A" query for
      |                                                |"ipv4
only.arpa."
      |                                                |-------------
-->
      |                                                |
      |              
                                  | "A" response:
      |                        
                        | "192.0.0.170"
      |                                  
              | "192.0.0.171"
      |                                            
    |<---------------
      |                                +-------------------
---------+
      |                                | "AAAA" synthesis using     |
 
     |                                | three Pref64::/n.          |
      |     
                           +----------------------------+
      |  "AAAA"
response with:                         |
      |  "2001:db8:42::192.0.0.170"     
               |
      |  "2001:db8:43::192.0.0.170"                    |
      | 
 "64:ff9b::192.0.0.170"                        |
      |<----------------------
-------------------------|
      |                                               
 |
   +----------------------------------------------+    |
   | If Pref64::/n
validation is not performed, a |    |
   | node can fetch prefixes from AAAA
responses  |    |
   | at this point and skip the steps below.      |    |
   +---
-------------------------------------------+    |
      |                        
                        |
      |  "PTR" query #1 for
"2001:db8:42::192.0.0.170  |
      |---------------------------------------------
-->|
      |  "PTR" query #2 for "2001:db8:43::192.0.0.170  |
      |-------------
---------------------------------->|


Cheers

Magnus Westerlund

On Mon, 2020-08-31 at 19:53 -0700, RFC Errata System wrote:
> The following errata report has been submitted for RFC7050,
> "Discovery of the IPv6 Prefix Used for IPv6 Address Synthesis".
> 
> --------------------------------------
> You may review the report below and at:
> 
https://protect2.fireeye.com/v1/url?k=e308ec2d-bda82f84-e308acb6-86959e472243-426efe53988d5301&q=1&e=fd4e0ad5-a48f-4d30-8722-a34c5c3b9c79&u=https%3A%2F%2Fwww.rfc-editor.org%2Ferrata%2Feid6270
> 
> --------------------------------------
> Type: Technical
> Reported by: Mark Andrews <marka@isc.org>
> 
> Section: 3.4
> 
> Original Text
> -------------
> "PTR" query #2 for "2001:db8:43::192.0.0.170
> 
> Corrected Text
> --------------
> "PTR" query #2 for "2001:db8:43::192.0.0.171
> 
> Notes
> -----
> The second PTR query should be for the reverse of the DNS64 mapped well known
> address 192.0.0.171.  This looks like a cut-and-paste error where 170 was not
> changed to 171.
> 
> Instructions:
> -------------
> This erratum is currently posted as "Reported". If necessary, please
> use "Reply All" to discuss whether it should be verified or
> rejected. When a decision is reached, the verifying party  
> can log in to change the status and edit the report, if necessary. 
> 
> --------------------------------------
> RFC7050 (draft-ietf-behave-nat64-discovery-heuristic-17)
> --------------------------------------
> Title               : Discovery of the IPv6 Prefix Used for IPv6 Address
> Synthesis
> Publication Date    : November 2013
> Author(s)           : T. Savolainen, J. Korhonen, D. Wing
> Category            : PROPOSED STANDARD
> Source              : Behavior Engineering for Hindrance Avoidance
> Area                : Transport
> Stream              : IETF
> Verifying Party     : IESG
-- 
Cheers

Magnus Westerlund 


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