In message <[email protected]>, Simon Perreault writes:
> Le 2014-04-16 18:12, Mark Andrews a =E9crit :
> > With the currently defined states yes you shut down everything for 1 and
> > 3. You don't shutdown for 0 and 2. I think some here want a currently
> > undefined state, no dhcp but local connectivity.
> > =
>
> > I would switch 1 and 2 around so that you go from most (0) to least (3)
> > IPv4 support on the interface.
> > =
>
> > Currently it is:
> > =
>
> > 0 full IPv4 connectivity
> > 1 all IPv4 off on the interface
> > 2 local (link/site not global) connectivity only on the interface
> > 3 no IPv4 on the machine.
>
> Uh, no. The levels are in strictly increasing order. 2 includes
> everything in 1, plus some more:
>
> 2 - No IPv4 upstream, local IPv4 restricted: Same semantics as value
> 1, with the following additions:
>
> 2 deals with propagation to downstream interfaces. It has nothing to do
> with link or site local stuff.
Part of the problem here is that "upstream" is the only "interface"
for singlely attached devices other than loopback. There is no
"only local connectivity is available" step for such nodes.
0 - IPv4 fully enabled: This is equivalent to the absence of the No-
IPv4 option. It is included here so that a DHCPv6 server can
explicitly re-enable IPv4 access by including it in a Reply
message following a Reconfigure, or similarly by a router in a
spontaneous Router Advertisement.
1 - No IPv4 upstream: Any kind of IPv4 connectivity is unavailable
on the link on which the option is received. Therefore, any
attempts to provision IPv4 by the host or to use IPv4 in any
fashion, on that link, will be useless. IPv4 MAY be dropped,
blocked, or otherwise ignored on that link.
Mark
> Simon
> -- =
>
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>
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Mark Andrews, ISC
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PHONE: +61 2 9871 4742 INTERNET: [email protected]
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