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Re: [v6ops] RFC7084

Nick Hilliard <nick@inex.ie> Tue, 10 December 2013 17:05 UTC

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Date: Tue, 10 Dec 2013 17:05:18 +0000
From: Nick Hilliard <nick@inex.ie>
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To: Ted Lemon <ted.lemon@nominum.com>, Sander Steffann <sander@steffann.nl>
Subject: Re: [v6ops] RFC7084
References: <96747494E3D74D41B20907035DB1E48DC7BB@MOPESMBX03.eu.thmulti.com> <2D09D61DDFA73D4C884805CC7865E611303B0269@GAALPA1MSGUSR9L.ITServices.sbc.com> <96747494E3D74D41B20907035DB1E48DCD72@MOPESMBX03.eu.thmulti.com> <alpine.DEB.2.02.1312100803370.24602@uplift.swm.pp.se> <F92E1B55-C74B-400C-B83E-6B50D175D121@steffann.nl> <7B4820C5-B562-4BE7-8C6A-CBCDABC39728@nominum.com>
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On 10/12/2013 16:51, Ted Lemon wrote:
> On Dec 10, 2013, at 6:08 AM, Sander Steffann <sander@steffann.nl> wrote:
>> As far as I know the M flag is linked only to IA_NA. As far as I can see IA_PD is not linked to the M flag at all.
> 
> There is no agreement on what the M and O bits do.   Some people think M means stateful address management; some think M means IA_NA and O means IA_PD.   RFC 4861 is actually fairly clear, at least to my reading of it, that "M" means IA_NA and IA_PD, and that "O" means stateless DHCPv6, but I've heard people argue vehemently that "M" means _only_ IA_NA, and that "O" means IA_PD, because prefixes aren't addresses.
> 
> So if you believe my reading of RFC 4861, you would set 'M' and expect the HG to get both IA_NA and IA_PD; RFC 7084 makes it clear that _either_ the 'M' or 'O' bit being set triggers the HG to do prefix delegation.
> 
> So if you want to do prefix delegation and not stateful address assignment, set the 'O' bit and _not_ the 'M' bit, even though that contradicts what RFC 4861 says.

<head spins>

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