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RE: the protocols for the M/O flags (Re: [rfc2462bis] whether we need the M/O flags)
This makes sense except I agree with Ralph o bit should just be DHCPv6 and m bit too. Also DHCPv6 implementations must coexist with stateless.
/jim
> -----Original Message-----
> From: ipv6-admin@ietf.org [mailto:ipv6-admin@ietf.org] On
> Behalf Of Christian Huitema
> Sent: Wednesday, April 28, 2004 12:29 PM
> To: JINMEI Tatuya / 神明達哉; Tim Chown
> Cc: ipv6@ietf.org
> Subject: RE: the protocols for the M/O flags (Re:
> [rfc2462bis] whether we need the M/O flags)
>
> I think a whole lot of the issue has to do with the
> supposedly mandatory nature of the M flag, which leads to
> phrases like "do DHCP, and only if it fails do auto-config."
> It would be much simpler to simply define the flags as
> "announcing an available service", as in:
>
> 1) The "M" flag is set to indicate that a DHCPv6 address
> configuration service is available on this link, as specified
> in RFC3315.
>
> 2) The "O" flag is set to indicate that a DHCPv6 information
> service is available on this link, as specified in RFC3736.
>
> We should then leave it at that, and leave it to nodes to
> decide whether they want to use these services or not. For
> example, a server with a configured address will never use
> DHCPv6 address configuration; an appliance that never has to
> resolve DNS names will never use the information service. By
> setting the flags to indicate service availability, we will
> reduce the amount of useless chatter on the link when the
> services are not in fact available.
>
> We should note that, from a protocol point of view, there is
> no need to use the M bit to control stateless address
> configuration. This function is already achieved by the
> "Autonomous flag" in the prefix information option. If the
> flag is not set, the hosts will not configure information
> from the prefix.
>
> -- Christian Huitema
>
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