[ippm] Re: IPPM adoption call for draft-gandhi-ippm-stamp-ext-hdr

Rakesh Gandhi <rgandhi.ietf@gmail.com> Thu, 23 May 2024 23:37 UTC

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From: Rakesh Gandhi <rgandhi.ietf@gmail.com>
Date: Thu, 23 May 2024 19:37:32 -0400
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To: Tal Mizrahi <tal.mizrahi.phd@gmail.com>
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CC: Marcus Ihlar <marcus.ihlar=40ericsson.com@dmarc.ietf.org>, "IETF IPPM WG (ippm@ietf.org)" <ippm@ietf.org>
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Subject: [ippm] Re: IPPM adoption call for draft-gandhi-ippm-stamp-ext-hdr
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Thank you Tal for your review and suggestions.

Please see replies inline with <RG>...

On Thu, May 16, 2024 at 12:30 AM Tal Mizrahi <tal.mizrahi.phd@gmail.com>

> Hi,
> I support the adoption of this document. I believe this document and the
> ICMPv6
> Loopback document [1] are two aspects of the same solution, and therefore
> they are complementary.
> [1] https://datatracker.ietf.org/doc/draft-mcb-6man-icmpv6-loopback/00/

<RG> Yes.

> There are a few issues that I believe should be addressed in the document:
> 1. Section 3.1 talks about "options", but does not specify which
> extension headers it refers to. I assume it refers to HBH and
> Destination options, but this should be specified. What about other
> extensions such as SRH? It would be best to define the mechanism in a
> generic way that allows the reflector to reflect the entire set of IPv6
> extension headers and options.
<RG> STAMP can carry both options.

<RG> There is an email discussion in-progress on reflecting IPv6 header

<RG> With IPv6 header, yes SRH would also be reflected.

> 2. "The Session-Reflector also MUST add the matching IPv6 option in
> the IPv6 header of the Session-Reflector test packet"
> I do not think that this is a good idea. The options on the forward
> side are not necessarily required on the reverse side. Moreover,
> this approach may cause an inflated size of the IPv6 extension on the
> reverse path. For example,
> take the IOAM incremental trace option. Every transit node increases
> its size. That means that on the reverse direction it may reach a
> prohibitively large size.
> I would suggest to drop this requirement.

<RG> Yes, this makes sense and this is covered in Section 5.3. But yes, the
quoted text above may need editing.

> 3. "The Session-Reflector also MUST add the matching MNA Sub-Stacks
> and Ancillary Data in the MPLS header of the Session-Reflector test
> packet"
> In addition to comment (2) above, please note that in MPLS the reverse
> path is not guaranteed to be MPLS. The reverse path may be over IP,
> for example.
> Again, I suggest to drop this requirement.

<RG> Same as above reply. Yes, this text needs some cleaning up.


> Cheers,
> Tal.
> On Fri, May 3, 2024 at 5:03 PM Marcus Ihlar
> <marcus.ihlar=40ericsson.com@dmarc.ietf.org> wrote:
> >
> > Hello IPPM,
> >
> >
> >
> > This email starts an adoption call for draft-gandhi-ippm-stamp-ext-hdr.
> This document has a normative dependency on
> draft-ietf-ippm-asymmetrical-pkts that was recently adopted by the IPPM
> working group.
> >
> >
> >
> > You can find the draft here:
> >
> > https://datatracker.ietf.org/doc/draft-gandhi-ippm-stamp-ext-hdr/
> >
> > https://www.ietf.org/archive/id/draft-gandhi-ippm-stamp-ext-hdr-00.html
> >
> >
> >
> > Please review the draft and respond to this email to indicate if you
> think IPPM should adopt this document as a working group item.
> >
> >
> >
> > This call will last for 3 weeks. Please reply by Friday, May 24.
> >
> >
> >
> > Best,
> >
> > Marcus & Tommy
> >
> >
> >
> > _______________________________________________
> > ippm mailing list
> > ippm@ietf.org
> > https://www.ietf.org/mailman/listinfo/ippm
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