Re: Running code - IPv6 mDNS MacBook Pro privacy (Was: I-D Action: draft-ietf-6man-ipv6only-flag-03.txt)

[Alexandre Petrescu <[e-mail]>]

Le 30/10/2018 à 16:18, Toerless Eckert a écrit :
> [...]
> I am not aware of any IP protocol version specific optimization options
> for mDNS. If there are common ways to make mDNS less chatty without
> slowing down discovery, they should be defined independently of the
> v6only flag discussion.

True.  I think the IPv6 version of mDNS is probable more chatty than the 
IPv4 version, in some cases.  But even then, removing the IPv4 mDNS 
could only save battery, compared to IPv4+IPv6 versions of mDNS.

As a side note, it is possible to improve other aspects of the IPv6 
version of mDNS only and not care about the IPv4 version.  One could ask 
Apple to make an improvement for the IPv6 version of mDNS with respect 
to privacy: stop putting the MacBook Pro owner's name in the mDNS 
request, because anybody on the link can see it and attach it to the 
global address.

One would not ask Apple to do that for IPv4, because IPv4 is not worth 
the effort, and because there is no privacy risk there (the IP address 
is behind NAT).



Alex

>
> Confounding the situation like you propoose is like "make ipv4 service
> discovery less chatty to a point that it may break because it doesn't
> matter if ipv6 is running" - and thats not a correct approach given how
> the service in question may be ipv4 only.
>
> There may be optimization options to prefer IPv6 over IPv4 discovery
> for dual-stack cases, maybe there is something already defined, but
> that could only be IMHO through timing - e.g.: look for service
> first via IPv6 and only try IPv4 adfter some short timeout. But that
> too would better be defined independently of the ipv6only flag
> discussion because its IMHO useful independent of the flag.
>
> Cheers
>      Toerless
>
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