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Re: [v6ops] New Version Notification for draft-ipversion6-loopback-prefix-00.txt

Lorenzo Colitti <lorenzo@google.com> Tue, 17 February 2015 10:40 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Tue, 17 Feb 2015 19:39:45 +0900
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To: Mark Andrews <marka@isc.org>
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Subject: Re: [v6ops] New Version Notification for draft-ipversion6-loopback-prefix-00.txt
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On Tue, Feb 17, 2015 at 1:29 PM, Mark Andrews <marka@isc.org> wrote:

> And you still need to have a strategy to deal with collisions.


bind() and EADDRINUSE?


> You also need to be able to communicate the resulting address to all
> components that need to know it.
>

127.0.0.0/8 has that problem too, but people seem to find it useful.


> I still see no benefit between picking a random block in 1::/32 vs
> picking a random block in fd00::/8.


But while a ULA block only works on the machine where it's configured,
127.0.0.0/8 is present on every machine.


> In both cases you have to deal with collisions.
>

With a decent random number generator, the probability of a collision is
infinitesimally low unless you start generating millions of them.

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