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Re: [v6ops] [dhcwg] IPv6-Only Preferred DHCPv4 option

Lorenzo Colitti <lorenzo@google.com> Thu, 05 December 2019 14:22 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Thu, 05 Dec 2019 23:21:59 +0900
Message-ID: <CAKD1Yr1Ogcjthx9is0_yAvPv39XnmV92MVkKnzdZwaKfnDdRNQ@mail.gmail.com>
To: Michael Richardson <mcr+ietf@sandelman.ca>
Cc: David Farmer <farmer@umn.edu>, Jen Linkova <furry13@gmail.com>, dhcwg@ietf.org, V6 Ops List <v6ops@ietf.org>, draft-link-dhc-v6only@ietf.org
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Subject: Re: [v6ops] [dhcwg] IPv6-Only Preferred DHCPv4 option
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On Thu, Dec 5, 2019 at 10:56 PM Michael Richardson <mcr+ietf@sandelman.ca>
wrote:

>     > Regarding IPv4-LL, I like Roy Marples suggestion of combining this
> with RFC
>     > 2563 to determine if a host is to configure an IPv4-LL, and in that
> case, the
>     > address returned should be 0.0.0.0.
>
> I agree.
> I didn't know that we had 2563 to turn off LL.
> So hosts should do whatever they want, and if the operator does not want
> v4LL, then they can turn this on.
>

Do any popular operating systems implement RFC 2563?


>     > Also, is there any reason that 0.0.0.0 shouldn't be the address
> retunded by a
>     > server "if the IPv6-only Preferred option is present in the
> Parameter Request
>     > List received from the client and the corresponding DHCP pool is
> explicitly
>     > configured as belonging to an IPv6-mostly network segment" as
> discussed in
>     > Section 3.3?
>
> I think that we were concerned that stupid hosts might configure it by
> mistake.
>

That, or that DHCP relays or snooping switches might get confused.

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