On Tue, 07 Apr 2009 13:44:58 -0400
James Carlson <James.D.Carlson at Sun.COM> wrote:
> Renee Danson writes:
> > On Tue, Apr 07, 2009 at 07:58:06AM -0400, James Carlson wrote:
> > > I would have expected to have separate address source controls for v4
> > > and v6 on a given interface, rather than a single combined control as
> > > that list seems to suggest. The behavior of v4 and v6 is slightly
> > > different in a number of areas.
> >
> > There are separate properties for v4 and v6 address source(s); but
> > both properties are of type nwam_addrsrc_t (and can be multi-valued).
> > The default value for v4 addrsrc is DHCP; the default for v6 addrsrc
> > is DHCPV6 and AUTOCONF. For v6, the expectation is that DHCPV6 and
> > AUTOCONF will generally be there, but since solaris does allow you
> > to turn off the use of those today, we chose to leave that option in.
Thus my rather strange comments about sense. In V4 you turn it on, in
V6 we are giving the user the option to ignore what the network tells
us to do.
>
> Ah, ok. It looked like a simple enumeration to me.
>
> > In reply to Michael's original question: nwam_addrsrc_t is a shared
> > enum, used for both the v4 and v6 addrsrc properties. STATIC is an
> > equally valid option for both v4 and v6. I don't think we ever
> > discussed whether we should have separate DHCPV4 and DHCPV6 values;
> > I'd imagine whoever wrote up the list (probably me or Alan, but I
> > can't remember) made separate DHCP items because they really are
> > separate protocols, they represent two fairly different approaches
> > to getting an address. I don't suppose they need to be separate;
> > it's obvious which protocol is intended based on which property the
> > value is assigned to. Do you have a preference?
>
> I don't see a need for discrimination between these two protocols at
> this level. If you want to get really generic, the IPv6 documentation
> calls these methods:
What I found strange was that we discriminated between the protocols
for some things (stateful) and not for others (manual). I don't really
care which was we go, but if the lack of consistency implied something
I'd missed.
mph
>
> stateful address configuration
> stateless address configuration
> manual address configuration
>
> It turns out that both IPv4 and IPv6 have methods that fall under each
> category. (Stateful is DHCPv4 or RA+DHCPv6; stateless is Link-Local
> or RA+NDP; and manual is obvious.)
>
> --
> James Carlson, Solaris Networking <james.d.carlson at sun.com>
> Sun Microsystems / 35 Network Drive 71.232W Vox +1 781 442 2084
> MS UBUR02-212 / Burlington MA 01803-2757 42.496N Fax +1 781 442 1677
