Re: [Idr] WG adoption call - draft-li-idr-flowspec-srv6-05,txt

"Ketan Talaulikar (ketant)" <ketant@cisco.com> Fri, 30 July 2021 12:19 UTC

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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Susan Hares <shares@ndzh.com>, "idr@ietf.org" <idr@ietf.org>, "draft-li-idr-flowspec-srv6@ietf.org" <draft-li-idr-flowspec-srv6@ietf.org>
Thread-Topic: [Idr] WG adoption call - draft-li-idr-flowspec-srv6-05,txt
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Date: Fri, 30 Jul 2021 12:18:50 +0000
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Subject: Re: [Idr] WG adoption call - draft-li-idr-flowspec-srv6-05,txt
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Hello,

I have reviewed https://datatracker.ietf.org/doc/html/draft-li-idr-flowspec-srv6-05 and have the following questions for the authors before we consider adoption.


  1.  FlowSpec v1 is supposed to be focussed on the DDOS use-case. I don't find any text in the draft that clarifies how/why this is related to DDOS use-case. To me, this seems like something for FlowSpec v2. Per (what I understood to be) WG consensus, this work is then perhaps deferred to v2.
  2.  The draft proposes a new type "Whole SID". My understanding from the text is that this rule applies to the IPv6 DA and not the segments within the SRH. If so, then:
     *   What distinguishes a SID from any other IPv6 address in the DA field?
     *   Why isn't the existing IPv6 DA type not sufficient?
  3.  The draft proposes a new type "Some bits of SID (SBoS)". Again, I believe this applies to the IPv6 DA again - so the same two Qs above apply to this type to. What prevents a router (mistakenly) applying this rule to packets with non-SRv6 SID in their DA.
  4.  When the SBoS type is used, the SRv6 SID structure MUST be indicated as part of the rule. Then the parts of the SID of interest that need to be matched are also given in the space for the SID. Is my understanding correct? If so, the text was not very clear to me.
  5.  The question of why this SBoS type is required again crops us since the base FlowSpec rule for DA does allow pattern matching on the IPv6 DA as well? Perhaps I am mistaken, and if so the document does not provide any text or justification for why these new types are required.
  6.  Finally, there is no text related to the specific applicability scenarios for these extensions. Exactly why it is difficult to determine whether this falls under v1 or v2 scope.

Thanks,
Ketan

From: Idr <idr-bounces@ietf.org> On Behalf Of Susan Hares
Sent: 23 July 2021 22:28
To: idr@ietf.org; draft-li-idr-flowspec-srv6@ietf.org
Subject: [Idr] WG adoption call - draft-li-idr-flowspec-srv6-05,txt

This begins a 2 week WG adoption call for draft-li-idr-flowspec-srv6-05.txt.

I am missing 3 IPR statements (Zhenbin Li , Lei Li , and Lei Liu).
These authors should send in their IPR statements in response to this call.

This draft is targeted for the V2 version of flow specification.
Flow specification v2 draft will be discussed at an interim on 9/13/2021.

If it is adopted, it will be developed as part of the v2 set of drafts.

Please consider if:

1) if this draft is useful for networks,
2) if you wish to adopt this draft prior to adopting flow specification v2.

Cheerily, Susan Hares