From mboxrd@z Thu Jan  1 00:00:00 1970
From: erik quanstrom <quanstro@quanstro.net>
Date: Sun,  3 Jan 2016 13:47:41 -0800
To: 9fans@9fans.net
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Subject: Re: [9fans] bug or feature ? --- ip/ping -6
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On Sun Jan  3 13:42:21 PST 2016, 23hiro@gmail.com wrote:
> your ipv4 "embedding" doesn't need to be part of the ping tool. it's
> not commonly used anyway.

i think the attribution here is false.  i read the man page for that information.

in any event, ping as patched is wrong.  addresses like icmpv6!address must
be accepted.  this may make the -4 flag silly in it's current form.

> allowing the ping tool to do dns lookups on the other hand are a
> common convenience.

but as such, one loses precision.  for example if i use a name, i can't
easily force the name lookup to find the ip i'm thinking of.

> perhaps i misunderstand. i'm not against adding zeros at the front.

see /sys/src/libip/ipaux.c^/uchar v4prefix

- erik