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Re: [v6ops] IPv6-Only Preferred DHCPv4 option

Ted Lemon <mellon@fugue.com> Mon, 09 December 2019 15:37 UTC

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From: Ted Lemon <mellon@fugue.com>
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Date: Mon, 09 Dec 2019 07:37:02 -0800
In-Reply-To: <CAKD1Yr1qSV4mzAqP7hNWKHbppQmJ=r-ajdFRfdscfvukhdUf=A@mail.gmail.com>
Cc: "Bernie Volz (volz)" <volz@cisco.com>, V6 Ops List <v6ops@ietf.org>
To: Lorenzo Colitti <lorenzo@google.com>
References: <F5AAD5B7-22BD-4474-9A1E-1A97AFFE47FC@cisco.com> <1655AE1A-EF2E-4720-BFBE-FA512CC4D240@cisco.com> <85E7ECA2-3538-48D7-99CB-7E978E7C0F03@fugue.com> <CAKD1Yr1qSV4mzAqP7hNWKHbppQmJ=r-ajdFRfdscfvukhdUf=A@mail.gmail.com>
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Subject: Re: [v6ops] IPv6-Only Preferred DHCPv4 option
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On Dec 9, 2019, at 7:24 AM, Lorenzo Colitti <lorenzo@google.com> wrote:
> Ted, I'm confused as to what you're proposing. I thought you were suggesting that the server would send back an OFFER with a yiaddr of 0.0.0.0. Is that not what you mean?

Oh crap, you’re right.  This is probably why Bernie isn’t agreeing.  I was confusing yiaddr and DHCP requested address.

BTW, I’ve been arguing for using the parameter request list to signal this option, and that is how it’s supposed to be used, but I’m realizing that some clients may still not actually correctly implement the parameter request list—this was always a problem.  And so these clients may be relying on the behavior they get when they don’t send a PRL.   So it might be better for the client to send the option, rather than requesting it, and then the server can reply back with it if the network is IPv6-preferred.

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