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

Tomek Mrugalski <tomasz.mrugalski@gmail.com> Mon, 09 December 2019 23:44 UTC

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To: "Bernie Volz (volz)" <volz@cisco.com>
Cc: "dhcwg@ietf.org" <dhcwg@ietf.org>, "v6ops@ietf.org" <v6ops@ietf.org>
References: <m1idEJQ-0000KPC@stereo.hq.phicoh.net> <EF1F2FB2-4FA0-4BCC-82B8-948EBE7915A6@fugue.com> <DM6PR11MB413793BCC3AFF44F7B8E101DCF5F0@DM6PR11MB4137.namprd11.prod.outlook.com> <8FD2BAAB-96D1-41F0-97A2-2D16CDAF999E@fugue.com> <1D8C9B8A-0F46-4B02-9402-2265F86D5F0F@cisco.com>
From: Tomek Mrugalski <tomasz.mrugalski@gmail.com>
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Date: Tue, 10 Dec 2019 00:44:44 +0100
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Subject: Re: [v6ops] [dhcwg] IPv6-Only Preferred DHCPv4 option
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On 06.12.2019 17:18, Bernie Volz (volz) wrote:
> BV> I will say that one issue that could exist with this option that
> is a bit unusual is that it is currently 0-length. We have only one
> other zero-length option that I recall, and that is Rapid Commit
> (which is client to server, not server to client). So, it is possible
> that there are clients that are unhappy about zero-length options.

Agree it's a valid concern. It could have affected some middleboxes
(snooping relay, firewall tracking state etc.). Fortunately, it's going
to be addressed in upcoming -01 rev. The option format is redefined to
be 4 octets long and will contain a timer value.

Tomek

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