[OPSAWG]Re: I-D Action: draft-ietf-opsawg-ipfix-gtpu-00.txt

["Sriram Gopalakrishnan (sriragop)" <[e-mail]>]

Hi Med

Many thanks for your review and comments. Appreciate it.

We are working on addressing them and will get back to you soon.

Thanks
--Sriram

From: [e-mail] <[e-mail]>
Date: Tuesday, 29 October 2024 at 6:45 PM
To: [e-mail] <[e-mail]>, [e-mail] <[e-mail]>
Subject: RE: I-D Action: draft-ietf-opsawg-ipfix-gtpu-00.txt
Hi Authors, all,

FWIW, you may find a review of this draft at:

* pdf: https://github.com/boucadair/IETF-Drafts-Reviews/blob/master/2024/draft-ietf-opsawg-ipfix-gtpu-00-rev%20Med.pdf
* doc: https://github.com/boucadair/IETF-Drafts-Reviews/raw/refs/heads/master/2024/draft-ietf-opsawg-ipfix-gtpu-00-rev%20Med.doc

Overall:

* The various IPFIX IEs are mirroring fields in the GTP-U header/packet.
* Some of the IE names is unfortunate (e.g., use of flags to refer to the version), but that's easy to fix.
* Also, given that a flag is not assigned yet (?), I suggest that the text insists that the export is based on what is observed. The exporter has not to know the internal structure of the gtpuFlags for example.
* There might be IEs that might be useful here (length, tunnel peer, list of extension headers, etc.).
* The presence of some IEs depends on the flags setting. A check at the collector side might be worth to elaborate (E, for example).
* For the use case section, I think some background is needed to digest the examples. Some of this can be achieved by simple references to the bunch of slicing drafts (see the explicit pointers provided in the review).
* The 3GPP spec include a case where tools to troubleshoot are important (e.g., zero udp checksum). I see a value in discussing how the use of the various IPFIX IEs can help here.
* Some more meaningful description text is needed for the various IEs.

Hope this helps.

Cheers,
Med

> -----Message d'origine-----
> De : [e-mail] <[e-mail]>
> Envoyé : samedi 19 octobre 2024 23:44
> À : [e-mail]
> Cc : [e-mail]
> Objet : I-D Action: draft-ietf-opsawg-ipfix-gtpu-00.txt
>
>
> Internet-Draft draft-ietf-opsawg-ipfix-gtpu-00.txt is now
> available. It is a work item of the Operations and Management
> Area Working Group (OPSAWG) WG of the IETF.
>
>    Title:   Export of GTP-U Information in IP Flow Information
> Export (IPFIX)
>    Authors: Daniel Voyer
>             Sriram Gopalakrishnan
>             Thomas Graf
>             Benoit Claise
>             Vyasraj Satyanarayana
>    Name:    draft-ietf-opsawg-ipfix-gtpu-00.txt
>    Pages:   13
>    Dates:   2024-10-18
>
> Abstract:
>
>    This document introduces IP Flow Information Export
> Information
>    Elements to identify information contained in the Generic
> Packet
>    Radio Service Tunneling Protocol User Plane header such as
> Tunnel
>    Endpoint Identifier, and data contained in its session
> container
>    extension header.
>
> The IETF datatracker status page for this Internet-Draft is:
> https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%252>
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