Re: [OPSAWG] Zaheduzzaman Sarker's Discuss on draft-ietf-opsawg-l3sm-l3nm-11: (with DISCUSS and COMMENT)

[[e-mail]]

Re-, 

Please see inline. 

Cheers,
Med

> -----Message d'origine-----
> De : Zaheduzzaman Sarker via Datatracker [mailto:[e-mail]]
> Envoyé : mercredi 22 septembre 2021 10:16
> À : The IESG <[e-mail]>
> Cc : [e-mail]; [e-mail];
> [e-mail]; [e-mail]; [e-mail]
> Objet : Zaheduzzaman Sarker's Discuss on draft-ietf-opsawg-l3sm-l3nm-11:
> (with DISCUSS and COMMENT)
> 
> Zaheduzzaman Sarker has entered the following ballot position for
> draft-ietf-opsawg-l3sm-l3nm-11: Discuss
> 
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> 
> 
> ----------------------------------------------------------------------
> DISCUSS:
> ----------------------------------------------------------------------
> 
> This specification refers to ietf-opsawg-vpn-common for qos related
> matching, hence I am raising similar discussion as I had for ietf-
> opsawg-vpn-common (see here https://datatracker.ietf.org/doc/draft-ietf-
> opsawg-vpn-common/).
> 
> This specification specifies qos classification based on L4 criteria and
> describes the procedure for TCP and UDP. It is possible that new L4
> protocols (for example QUIC) use UDP as substrate hence can create
> ambiguity based of the procedure described in the specification.
> 
> This specification should consider such potential substrate usage of L4
> protocols (specially UDP) and hint on the potential augmentations (there
> might be several ways to do that) or scope it down to not support such
> cases.

[[Med]] Added this NEW text to echo the proposal in the common module: 

         As discussed in [I-D.ietf-opsawg-vpn-common], some transport
         protocols use existing protocols (e.g., TCP or UDP) as
         substrate.  The match criteria for such protocols may rely upon
         the 'protocol' under 'l3', TCP/UDP match criteria shown in
         Figure 26, part of the TCP/UDP payload, or a combination
         thereof.  This version of the module does not support such
         advanced match criteria.  Future revisions of the VPN common
         module or augmentations to the L3NM may consider adding match
         criteria based on the transport protocol payload (e.g., by
         means of a bitmask match).

> 
> 
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
> 
> Thanks to the authors for their efforts in the specification.
> 
> Additional comment(s)-
> 
> * I think if would be good if this specification also discusses the
> implication of wrong classification (e.g. for qos) based on the model
> specified here (no particular suggestion from me where but may be in
> security considerations).
> 

[[Med]] I think this is already covered by this part in the draft: 

      In addition,
      an attacker may modify the attributes of a running service (e.g.,
      QoS, bandwidth, routing protocols), leading to malfunctioning of
      the service and therefore to SLA violations.

Please let me know if there is more to say here. Thanks. 

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