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Re: [v6ops] New Version Notification for draft-yourtchenko-ra-dhcpv6-comparison-00.txt (fwd)

Brian E Carpenter <brian.e.carpenter@gmail.com> Sun, 08 December 2013 21:14 UTC

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Date: Mon, 09 Dec 2013 10:14:32 +1300
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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To: Owen DeLong <owen@delong.com>
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Cc: "v6ops@ietf.org" <v6ops@ietf.org>
Subject: Re: [v6ops] New Version Notification for draft-yourtchenko-ra-dhcpv6-comparison-00.txt (fwd)
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On 09/12/2013 08:38, Owen DeLong wrote:
> On Dec 8, 2013, at 11:22 , Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
> 
>> On 08/12/2013 19:40, Owen DeLong wrote:
>>> On Dec 7, 2013, at 22:25 , Andrew Yourtchenko <ayourtch@cisco.com> wrote:
>> ...
>>>> I think you nailed it here: With RA you *discover* the routers available on the link, with DHCP in legacy IP, you *configure* them.
>>> No, with DHCP, you discovered what some remote host rumored them to be.
>> I don't think we should be having this argument. We should be
>> trying to write down objectively the type of scenarios where
>> DHCPv6 is applicable, the type of scenarios where RA-only is
>> applicable, and the type of scenarios where both (simultaneously)
>> are applicable.
>>
>> There's no right or wrong answer here.
>>
>>   Brian
> 
> In IPv6, as I read the RFCs, there's no valid way for a host to know that it is supposed to get information from a DHCPv6 server unless it receives an RA with the M and/or O bits set.
> 
> As such, the options are not DHCPv6 only, RA-only, and Both, but, RA-only and Both.

Two comments on that:

a) Yes, where I wrote DHCPv6, I should have written "DHCPv6 with
minimal RA", with "Both" implying more-than-minimal RA.

b) IMHO we need to fix the ambiguity caused by the M/O bits'
current definition.

http://tools.ietf.org/html/draft-liu-6renum-dhcpv6-slaac-switching

In any case I'd like to see neutral analysis in the draft.


   Brian

> The scenarios where RA-Only make sense are any scenario where you do not need greater control of the client configuration than Prefix information, routing information, and DNS resolver addresses and search strings.
> 
> In any scenario where you need to supply the host with more configuration information on a dynamic basis, DHCPv6 is also required.
> 
> Also, if you want dynamic DNS updates, deterministic assigned suffixes, etc., these fall into the DHCPv6 realm.
> 
> It's really as simple as that as near as I can tell.
> 
> If you want to run without RAs, then you are into the realm of static configuration. I, personally, do not see this as a problem.
> 
> Owen
> 
>

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