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

Brian E Carpenter <brian.e.carpenter@gmail.com> Mon, 27 November 2017 23:59 UTC

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Subject: Re: [v6ops] Combining IPv6 ND and DHCPv6 into a single, unified function
To: Michael Richardson <mcr+ietf@sandelman.ca>, Fred Baker <fredbaker.ietf@gmail.com>
Cc: "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> <26398.1511460320@obiwan.sandelman.ca>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Tue, 28 Nov 2017 12:59:12 +1300
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On 24/11/2017 07:05, Michael Richardson wrote:
> 
> Fred Baker <fredbaker.ietf@gmail.com> wrote:
>     >> My understanding is that Fred Templin essentially wants to carry DHCP
>     >> (configuration) options in ND/RA.
> 
>     > On thing that I have never understood is the lack of an RA option that
>     > carries any DHCPv6 option. This entire silly debate would end if RAs
>     > encompassed DHCP options.
> 
> I think that this is mostly what Fred wants to define.
> 
> Apparently he also wants to do stateful DHCPv6 things (such as PD), which I
> am much less enthusiastic about putting into RAs/NDs as they cease to be
> idempotent.

I think a key sentence in the draft is this:
"The IPv6 ND function then acts as a Lightweight DHCPv6
 Relay Agent (LDRA) [RFC6221] to forward the message to the DHCPv6
 relay or server function on-board the router."

If it's clear that ND is serving only as a lightweight relay,
doesn't your concern go away? As far as I can see, lightweight
relays are stateless.

      Brian