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

Jen Linkova <furry13@gmail.com> Fri, 06 December 2019 07:14 UTC

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From: Jen Linkova <furry13@gmail.com>
Date: Fri, 06 Dec 2019 18:14:34 +1100
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To: David Farmer <farmer@umn.edu>
Cc: Michael Richardson <mcr+ietf@sandelman.ca>, 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 12:09 PM David Farmer <farmer@umn.edu> wrote:
>> > 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?
>>
>> We discussed that but some concerns were raised - allegedly it might
>> make some DHCP-snooping switches very unhappy.
>
>
> If that is really the case then I think some discussion on selecting the address returned is probably needed in the draft.

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.
"

If there is no dedicated address, I guess it does not really matter
what address from the pool is returned.
Or am I missing anything?

-- 
SY, Jen Linkova aka Furry

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