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Re: [Int-area] New Draft - ICMPv6 Loopback

"Eric Vyncke (evyncke)" <evyncke@cisco.com> Tue, 06 June 2023 17:33 UTC

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From: "Eric Vyncke (evyncke)" <evyncke@cisco.com>
To: Bob Hinden <bob.hinden@gmail.com>, Tal Mizrahi <tal.mizrahi.phd@gmail.com>
CC: "int-area@ietf.org" <int-area@ietf.org>
Thread-Topic: [Int-area] New Draft - ICMPv6 Loopback
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Date: Tue, 06 Jun 2023 17:33:46 +0000
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Subject: Re: [Int-area] New Draft - ICMPv6 Loopback
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Without any hat, I agree with Bob.

This I-D should eventually go to 6MAN WG though (with my AD hat)

-éric

On 06/06/2023, 08:34, "Int-area on behalf of Bob Hinden" <int-area-bounces@ietf.org <mailto:int-area-bounces@ietf.org> on behalf of bob.hinden@gmail.com <mailto:bob.hinden@gmail.com>> wrote:


Tal,


I did a quick read of your draft.


As noted in the draft this seems to be very similar to ICMPv6 Echo/Echo Reply. The change is to include the request packet in the response, not just the payload.


While I don’t have any real opinion on the need for this, I do think it would be a lot simpler if the draft just defined a new Code field value for Echo Request/Reply that specified this behavior. Currently the Code field is set to zero, another value could specify this behavior.


Deployment might be easier as I suspect ICMPv6 types other than the current definitions will be filtered in many places.


Bob






> On Jun 6, 2023, at 4:54 AM, Tal Mizrahi <tal.mizrahi.phd@gmail.com <mailto:tal.mizrahi.phd@gmail.com>> wrote:
> 
> Hi,
> 
> New draft: https://datatracker.ietf.org/doc/draft-mcb-intarea-icmpv6-loopback/ <https://datatracker.ietf.org/doc/draft-mcb-intarea-icmpv6-loopback/>
> 
> We have posted a new draft that proposes two new ICMPv6 message types:
> Loopback Request and Reply.
> ICMPv6 Loopback is very similar to Echo, except that after a Loopback
> Request is sent, its corresponding Reply includes as much of the IPv6
> Loopback Request packet as possible, including the IPv6 header and
> IPv6 extension headers and options if they are present.
> 
> We believe that ICMPv6 Loopback can be very useful for returning IPv6
> options that were included in Request packet back to the sender,
> including for example sending IOAM [RFC 9197] data from the Request
> back to the sender, sending the SRH [RFC 8754] of the Request back to
> the sender, as well as for in-progress / future protocols such as
> draft-filsfils-spring-path-tracing and draft-kumar-ippm-ifa.
> 
> We would be happy for feedback, as well as suggestions about whether
> the INT-AREA WG is the right place to discuss this draft.
> 
> Cheers,
> Tal.
> 
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