Re: I-D Action: draft-carpenter-6man-rfc6874bis-00.txt

Brian E Carpenter <brian.e.carpenter@gmail.com> Fri, 09 July 2021 21:10 UTC

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Subject: Re: I-D Action: draft-carpenter-6man-rfc6874bis-00.txt
To: Michael Richardson <mcr+ietf@sandelman.ca>, Philip Homburg <pch-ipv6-ietf-7@u-1.phicoh.com>, ipv6@ietf.org
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Sat, 10 Jul 2021 09:10:19 +1200
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On 10-Jul-21 05:00, Michael Richardson wrote:
> 
> Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
>     >> So, how is working even though you have one non-loopback interface?
> 
> Er, I mispoke.  More than one non-loopback interface.
> 
>     > I'm not sure I understand that question. As far as I can tell, there is
>     > no named interface in Windows that fulfills the function of 'lo' in
>     > Linux.  So I'm guessing it's special-cased in the code, but somebody at
>     > Microsoft knows the answer.
> 
> Really, no loopback?  What is ::1 attached to?

A mystery to me... amusingly enough, Windows allows this:

C:\WINDOWS\system32>ping ::1%0

Pinging ::1 with 32 bytes of data:
Reply from ::1: time<1ms

so I guess interface 0 is the loopback, but it is listed nowhere as such.

>     > Anyway... Wireshark tells me that the ping is going out on the Ethernet
>     > interface, which is %7, rather than WiFi, which is %23. So Windows
>     > picks Ethernet when given the choice.
> 
> I thought it would only work when you had one (active) interface.

Clearly they don't mimic the Unix/Linux model.

   Brian