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Re: [v6ops] IPv6-Only Preferred DHCPv4 option

Jen Linkova <furry13@gmail.com> Thu, 05 December 2019 07:08 UTC

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From: Jen Linkova <furry13@gmail.com>
Date: Thu, 05 Dec 2019 18:08:23 +1100
Message-ID: <CAFU7BAQ88taoTnABU5tQ7U=tswa+XwB+L=feek7Ts_FSXn7mLQ@mail.gmail.com>
To: Fernando Gont <fgont@si6networks.com>
Cc: Brian E Carpenter <brian.e.carpenter@gmail.com>, V6 Ops List <v6ops@ietf.org>
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Subject: Re: [v6ops] IPv6-Only Preferred DHCPv4 option
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On Thu, Dec 5, 2019 at 4:52 PM Fernando Gont <fgont@si6networks.com> wrote:
> Let me rephrase my question. What are the semantics of the option? "Turn
> off IPv4?" --

"Turn off IPv4 if $CONDITION is met". Currently $CONDITION is
hardcoded in the draft as 'NAT64'.
It is critical that both server and the client assume the same condition.

> If that's the semantics, then what triggered the use of
> the option, from the pov of the ipv4 host, is rather irrelevant.

It is relevant. We do not want the host to send the option because it
supports NAT64 environment, while the server is responding with the
option because the administrator enabled IPX for that segment.

> Side question: What if the network provides NAT64 service, but there are
> local nodes that do not implement IPv6 (e.g., printers)?

Those nodes will continue receive IPv4 addresses.
If your question is 'how IPv6-only hosts on that segment would talk to
those IPv4-only devices' - well, they would not. If I need to migrate
a segment to IPv6-mostly mode I would not put any IPv4-only services
there which IPv6-only devices need to access.
Pls remember that the administrator needs to explicitly enable this
functionality for the network segment.

-- 
SY, Jen Linkova aka Furry

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