Re: [dhcwg] [v6ops] Combining IPv6 ND and DHCPv6 into a single, unified function

Brian E Carpenter <brian.e.carpenter@gmail.com> Tue, 28 November 2017 19:29 UTC

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Subject: Re: [dhcwg] [v6ops] Combining IPv6 ND and DHCPv6 into a single, unified function
To: Lorenzo Colitti <lorenzo@google.com>
Cc: "STARK, BARBARA H" <bs7652@att.com>, Fred Baker <fredbaker.ietf@gmail.com>, Michael Richardson <mcr+ietf@sandelman.ca>, "dhcwg@ietf.org" <dhcwg@ietf.org>, "v6ops@ietf.org" <v6ops@ietf.org>, "6man@ietf.org" <6man@ietf.org>
References: <9debb1672e3d4f0d89d672d64e0fe579@XCH15-06-08.nw.nos.boeing.com> <CAKD1Yr1+a+Bg3N=pX5_X2vhvkf50hY7N_Ay=aQQyq5ogsEWWMw@mail.gmail.com> <4e01cd6cc5234daca2f7be55b8cc28b0@XCH15-06-08.nw.nos.boeing.com> <27327.1511369630@obiwan.sandelman.ca> <E49D982F-9A83-4B7E-B65F-2CB07AB56ADD@gmail.com> <2D09D61DDFA73D4C884805CC7865E6114DCC2BF8@GAALPA1MSGUSRBF.ITServices.sbc.com> <8a5feb3a-d18e-1773-0539-3da22e582c70@gmail.com> <CAKD1Yr3_2QnFdz6ooEnSeXc7P2HPkf=dSwT8L8NKf4=XqLfHWQ@mail.gmail.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Wed, 29 Nov 2017 08:29:18 +1300
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On 28/11/2017 18:21, Lorenzo Colitti wrote:
> On Tue, Nov 28, 2017 at 8:06 AM, Brian E Carpenter <
> brian.e.carpenter@gmail.com> wrote:
> 
>> Yes and no. Let's consider a host that needs a particular piece of
>> information. As an example, consider the address of the next-hop router
>> for a given prefix. There are three separate parts to this:
>>
>> 1. Receiving some sort of message containing an appropriate option.
>> 2. Decoding the option
>> 3. Storing the result.
>> [...]
>>
> 
> You can't really separate these steps because the protocols that deliver
> configuration information have different semantics. For example, DHCPv6 is
> poll-based and requires explicit renewal, but RAs are push-based.

I think those are mechanical details. RAs expire & the host waits
for renewal; a DHCP host solicits renewal; but from a bird's eye view
that is a hidden distinction.

    Brian