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

"Bernie Volz (volz)" <volz@cisco.com> Fri, 06 December 2019 14:51 UTC

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From: "Bernie Volz (volz)" <volz@cisco.com>
To: Ted Lemon <mellon@fugue.com>, Roy Marples <roy=40marples.name@dmarc.ietf.org>
CC: "dhcwg@ietf.org" <dhcwg@ietf.org>, V6 Ops List <v6ops@ietf.org>, "draft-link-dhc-v6only@ietf.org" <draft-link-dhc-v6only@ietf.org>
Thread-Topic: [v6ops] [dhcwg] IPv6-Only Preferred DHCPv4 option
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Date: Fri, 06 Dec 2019 14:51:23 +0000
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Subject: Re: [v6ops] [dhcwg] IPv6-Only Preferred DHCPv4 option
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> There is a reason why DHCP includes a parameter request list option.  If the client doesn’t ask for this newfangled option, it shouldn’t see it.  And so we can know for sure that the client supports this capability, because it asked for it.

Even if a DHCP server sent the option without it being requested, why would the client use it if it didn't ask for it?

- Bernie

-----Original Message-----
From: v6ops <v6ops-bounces@ietf.org> On Behalf Of Ted Lemon
Sent: Thursday, December 5, 2019 9:39 AM
To: Roy Marples <roy=40marples.name@dmarc.ietf.org>
Cc: dhcwg@ietf.org; V6 Ops List <v6ops@ietf.org>; draft-link-dhc-v6only@ietf.org
Subject: Re: [v6ops] [dhcwg] IPv6-Only Preferred DHCPv4 option

On Dec 4, 2019, at 8:46 PM, Roy Marples <roy=40marples.name@dmarc.ietf.org> wrote:
> So in simple terms.
> The server offers some information.
> Given this information (in current DHCP semantics) we can RENEW (T1) or REBIND (T2).
> If the client does not request the offer (hey! I see this new fangled option here that says NO DHCP) the client can still accept the T2 timer at the very least.
> 
> Think of the analogus RFC 7083 - Modification to Default Values of SOL_MAX_RT and INF_MAX_RT. This RFC goes out of its way not to add new timers.

There is a reason why DHCP includes a parameter request list option.  If the client doesn’t ask for this newfangled option, it shouldn’t see it.  And so we can know for sure that the client supports this capability, because it asked for it.

Is there any reason why we /wouldn’t/ want to do this?

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