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Re: [v6ops] IPv6-Only Preferred DHCPv4 option

Jen Linkova <furry13@gmail.com> Tue, 10 December 2019 00:54 UTC

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From: Jen Linkova <furry13@gmail.com>
Date: Tue, 10 Dec 2019 11:54:28 +1100
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To: Philip Homburg <pch-v6ops-9@u-1.phicoh.com>
Cc: V6 Ops List <v6ops@ietf.org>
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Subject: Re: [v6ops] IPv6-Only Preferred DHCPv4 option
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On Fri, Dec 6, 2019 at 9:04 PM Philip Homburg
<pch-v6ops-9@u-1.phicoh.com> wrote:
> One thing that worries me a bit is that with this option the host signals that
> it doesn't need an IPv4 address if there is NAT64.
>
> There are two things that can go wrong: the network provides the NAT64
> transation prefix in a way that the host doesn't understand.

I do not think the network is expected to provide NAT64 prefix now in any way.
Our pref64 draft has not been published yet, and anyway it's an
additional signal.

> The second thing, what if some other IPv4aaS technology becomes popular,
> do we need a new option for every IPv4aaS technology?

Ah, that's the unresolved issue in the draft yet, some more work (and
input from the WG) required.
What could be done here:
1) we can declare that we do not believe there is any chance of any
other transition mechanism for IPv6-only hosts to appear any time
soon.
2) we can - as it's been proposed - add a field to encode the
transition technologies supported by the host (e.g. as a bit mask).

Personally I'd be very surprised to see any new mechanism to be
developed and adopted but I'd not oppose #2 either.

-- 
SY, Jen Linkova aka Furry

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