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

Lorenzo Colitti <lorenzo@google.com> Tue, 17 February 2015 02:30 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Tue, 17 Feb 2015 11:30:27 +0900
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To: Falcon Darkstar Momot <falcon@iridiumlinux.org>
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Subject: Re: [v6ops] FW: New Version Notification for draft-ipversion6-loopback-prefix-00.txt
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On Tue, Feb 17, 2015 at 11:27 AM, Falcon Darkstar Momot <
falcon@iridiumlinux.org> wrote:

>  That doesn't make sense. A /64 *is* a large swath of IPv6 address space.
> And there are lots of them.
>
>
> The point is that they're addresses, not tags.  Why would you allocate
> addresses that have absolutely no purpose in relation to routing?
>

That's what we did in IPv4 with 127.0.0.0/8. As a proportion to the size of
the IPv4 address pool, that's way more space than we're talking about here.


> If a use case (involving routing) for multiple loopback addresses is
> evident, I'd say this makes sense, but I just don't see it.  DNS RBL
> tagging is not such a use case.
>

Pointing network  at addresses inside 127.0.0.0/8 is a very reliable way to
cause said applications to fail fast without emitting any packets. We don't
have a way to do that in IPv6 except pointing them at ::1.

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