I believe Ted is saying the operator achieves its objectives because
when DHCP resolves the FQDN in order to distribute the address, it
invokes the DNS mappings that have been set up by the regional teams.
I see a potential gap in this reasoning. Could it be that the regional
teams manage different DNS servers with different content for the saME
FQDN? If so, how would DHCP know which DNS server to query to achieve
the correct resolution for the given subscriber?
Mohamed et al, have I characterized the problem correctly? If so, Ted,
what is your response?
On 19/10/2010 9:21 AM, Alain Durand wrote:
On Oct 18, 2010, at 11:22 AM, Ted Lemon wrote:
[snip]
See, this is the disconnect. Are you trying to suggest that this
statement logically follows the previous paragraph's description of
your circumstances? Or was that just a non-sequitur? Because I
don't see any logical connection between these two statements.
It seems to me that you are saying that the DNS will be under the
control of this regional team, and the DHCP server is not. So the
regional team is the only team that can make changes to the DNS.
But since the DHCP server will be looking the name up in the DNS,
this is a non-problem. Whether the DHCP server provides an FQDN
or an IP address, the source for the IP address the client
eventually uses will _always_ be the DNS. So the regional team
will not have a problem updating that information.
Furthermore, even if it were the case that the regional team
couldn't do what you want, is that any justification for the
position you've taken? I don't think it is, because it's an
operational issue specific to your organization. We can't design
protocols to suit your organization. Obviously we'd like to have
the flexibility to address your needs, but as far as I can tell, we
*have* that flexibility. And you haven't given any technical
explanation for why we don't.
[Alain] Ted: We always complain in IETF that operators left the room,
that we need more operator guidance. We cannot say that and at the
same time dismiss operator input.
Both Mohamed& Roberta have indicated that their operational model is
to use a layer of indirection between national engineering and
regional engineering. I'm not aware of any model in DHCP that allows
for such an indirection. Thus, they apparently have decided, for
operational reasons, to use DNS as their level of indirection.
Apparently, for talking to Mohamed off-line, this is current, well
deployed practice, and not just for Orange/FT, but done by many
ISPs.
We cannot ignore it. Operational needs should be as important as
technical needs.
[/Alain.]
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