What about taking advantage of the ICMP error mechanism?

>From Phone
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From: Int-area <[email protected]> on behalf of Florian Obser 
<[email protected]>
Sent: Wednesday, June 7, 2023 8:15:21 AM
To: Luigi IANNONE <[email protected]>
Cc: [email protected] <[email protected]>; [email protected] <[email protected]>
Subject: [EXTERNAL] Re: [Int-area] [IPv6] New Draft - ICMPv6 Loopback

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On 2023-06-07 11:42 UTC, Luigi IANNONE 
<[email protected]> wrote:
> For FreeBSD it looks like code MUST be 0 or the packet is dropped:
>

this is coming from KAME so everything that derives from there has
this. E.g. it's also present in OpenBSD & NetBSD.

> (file netinet6/icmp6.c line 550: 
> http://fxr.watson.org/fxr/source/netinet6/icmp6.c#L550<http://fxr.watson.org/fxr/source/netinet6/icmp6.c#L550>)
>
>
> case ICMP6_ECHO_REQUEST:
> icmp6_ifstat_inc(ifp, ifs6_in_echo);
> if (code != 0)
> goto badcode;
>
>
> Ciao
>
> L.

--
In my defence, I have been left unsupervised.

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