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From: Thomas Huth <thuth@redhat.com>
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Date: Tue, 22 Mar 2016 09:02:31 +0100
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Subject: Re: [Qemu-devel] [PATCH] slirp: Allow to disable IPv4 or IPv6
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To: Markus Armbruster <armbru@redhat.com>, Samuel Thibault <samuel.thibault@gnu.org>
Cc: jan.kiszka@siemens.com, jasowang@redhat.com, qemu-devel@nongnu.org

On 22.03.2016 08:41, Markus Armbruster wrote:
> Samuel Thibault <samuel.thibault@gnu.org> writes:
> 
>> Markus Armbruster, on Mon 21 Mar 2016 08:33:52 +0100, wrote:
>>> Samuel Thibault <samuel.thibault@ens-lyon.org> writes:
>>>> Make net=0.0.0.0 disable IPv4 and ip6-net=:: disable IPv6, so the user can
>>>> setup IPv4-only and IPv6-only network environments.
>>>
>>> Do "net=" and "ip6-net=" mean anything useful?  If not, wouldn't that be
>>> a more natural way to switch off than abusing the wildcard address?
>>
>> An empty parameter looks odd to me.  0.0.0.0 is used e.g. by ifconfig to
>> disable an interface, that's why I thought about it.  Perhaps an even
>> better way would be net=none and ip6-net=none?
> 
> An empty string as parameter value looks just fine to me.  "none" would
> be fine, too, because it's not a valid value so far.  I acknowledge the
> precedence for abusing the wildcard address.  Pick something you like.

I like the "=none" syntax.

 Thomas