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

"Bernie Volz (volz)" <volz@cisco.com> Fri, 06 December 2019 15:59 UTC

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From: "Bernie Volz (volz)" <volz@cisco.com>
To: Michael Richardson <mcr+ietf@sandelman.ca>, Jen Linkova <furry13@gmail.com>
CC: V6 Ops List <v6ops@ietf.org>, "draft-link-dhc-v6only@ietf.org" <draft-link-dhc-v6only@ietf.org>, "dhcwg@ietf.org" <dhcwg@ietf.org>
Thread-Topic: [v6ops] [dhcwg] IPv6-Only Preferred DHCPv4 option
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Date: Fri, 06 Dec 2019 15:59:51 +0000
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Subject: Re: [v6ops] [dhcwg] IPv6-Only Preferred DHCPv4 option
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I would keep it simple and not change the server's processing with respect to the a (temporarily) assigned address in the DHCPOFFER.

See my other email on the topic (https://mailarchive.ietf.org/arch/msg/dhcwg/T_5gklM3klgjHeMOlOhEF4e-IWI).

- Bernie

-----Original Message-----
From: v6ops <v6ops-bounces@ietf.org> On Behalf Of Michael Richardson
Sent: Friday, December 6, 2019 10:26 AM
To: Jen Linkova <furry13@gmail.com>
Cc: V6 Ops List <v6ops@ietf.org>; draft-link-dhc-v6only@ietf.org; dhcwg@ietf.org
Subject: Re: [v6ops] [dhcwg] IPv6-Only Preferred DHCPv4 option


Jen Linkova <furry13@gmail.com> wrote:
    > The draft currently suggests that the server is configured with a
    > dedicated IPv4 address per pool for this purpose:

    > "If the pool is explicitly configured with a dedicated IPv4
    > address to be returned to IPv6-only capable clients the server MUST
    > specify that address as the client's network address and MUST NOT
    > verify its uniqueness.  Otherwise the server SHOULD follow the
    > recommendations in [RFC2131].  The client is not expected to use that
    > IPv4 address so if the client responds with the DHCPREQUEST message
    > for that address the server SHOULD respond with DHCPNAK.
    > "

This is why this document belongs in DHC, because this is new server logic :-) I think that maybe we are trying to be too cute here.

The goal is not to assign an address, but ciaddr is a fixed field, so we have to put something in, and I think that we are worried that 0.0.0.0 is going to confuse DHCP relay nodes that snoop.

At this point, Jen is trying to give the DHCP administrator some rope with which to work around confusing the snoop node by creating a pool of one address.

Maybe we can return 225.0.0.1.

--
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works  -= IPv6 IoT consulting =-

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