Hi Lars,
Lars Eggert wrote:
On 2009-4-22, at 2:19, Christian Vogt wrote:
It seems that folks are considering two related, yet still orthogonal
topics for inclusion in the MIF charter:
- Conflicts between configuration parameters.
- Issues with address selection.
I agree that both of these are important and should be worked on (and
with the rest of your email, basically).
The first one is what I thought MIF would be focusing on, as an INT WG
is IMO the right venue for this.
The second one is also important, but much more tricky, because it
ties in with transports and applications (as Keith and others have
pointed out already). Topics that cross area boundaries are always a
bit difficult to charter. I'm at this point not fully convinced that
simply throwing this in with topic #1 into one WG is going to work.
I disagree with your conclusion for two reasons:
(1) As I pointed out in my previous message to Christian, address
selection is not (today) a transport-layer or application-layer function
in most cases. Given that this is currently an Internet-layer function,
I think it makes sense to analyze the issues with address selection (as
part of the whole address/interface/router selection process) in an
Internet Area group. If we find that one of the problems we have is
that the Internet layer doesn't have the right information to make these
decisions, then possibly some follow-on work might need to be chartered
elsewhere.
(2) There is no way that these decisions can be made solely at the
transport or application layer, because source (and to a lesser degree
destination) address selection is tightly tied to the first-hop
forwarding decision. The outbound interface, source address and default
router all have to be selected in a coordinate process, to avoid sending
traffic that will be discarded on the outbound path, due to router filters.
So, while agree that address selection affects transport layers and
applications, and that it might be necessary for transport layers and
applications to have better ways of influencing it, I do not believe
that address selection is a transport layer or applications layer
function today, nor do I think it can be done solely at those layers in
the future.
Margaret
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