Re: [v6ops] Fwd: I-D Action: draft-jjmb-v6ops-unique-ipv6-prefix-per-host-00.txt

[Tore Anderson <[e-mail]>]

* Brian E Carpenter <[e-mail]>

> Somebody did mention that in practice, M==O==0 might actually mean
> "we run DHCPv6 but forgot to set the bits". But I don't know what to
> do about that.

Another possibility is that there are multiple routers on the link
but not all of them one of them include a, or are aware of any, DHCPv6
service present on the link.

To accomodate for such a network I'd expect nodes to determine the
effective value of the flag in question to be 1 as long as at least 1
RA with the flag set to 1 is received (boolean OR, in other words).
Consequentally, a single RA with M=O=0 shouldn't be understood to
authoritatively communicate that there is no DHCPv6 service present on
the link.

However if each and every received RA on the link contain M=O=0 I think
it is the most expected node behaviour (cf. RFC4861's statement that
M=O=0 «indicates that no information is available via DHCPv6») to not
start any DHCPv6 client at all - and for the record, that would mean
not requesting IA_PD.

Tore