Le 19/10/2012 18:16, Mikael Abrahamsson a écrit :
On Fri, 19 Oct 2012, Behcet Sarikaya wrote:
It is not just implementing that code in one node. DHCPv6-PD
requires Delegating Router on a DHCP server somewhere and then
Requesting Router on the edge router (there was a proposal to
implement it on a UE).
I know of implementations that do this in a single box (local
DHCPv6-PD address pool), so that's not a deciding argument as far as
I can tell.
It is a system support issue, I think.
Well, that's what I'm after, the actual rationale. In the document,
as far as I could find, the only motivation for implenting PD in ND
was "DHCPv6-PD might not be available".
One point that guided towards choosing ND over DHCP is topology. DHCP
topology can be relatively complex with Client/Relay/Server, whereas ND
is simpler one-on-one.
In a setting with an IV (Internet Vehicle, with SIM card) and an LV
(Leaf Vehicle, no SIM card) the IV needs to run a DHCP Client to obtain
a prefix for its devices, because LTE only uses DHCP for PD. Then, if
LV requests a prefix from IV then IV should be able to run DHCP Relay
(or DHCP Server) as well. This makes IV to must support both Client
_and_ Relay (or Server). This may be feasible in practice but I think
it would be cleaner to have distinct protocols on a same machine for
receiving a prefix and for sending a prefix.
That's one aspect which led to this.
There is also the question of availability of DHCP software on smaller
platforms which have no SIM card. It may be easier to do this with ND
in smaller settings.
Alex
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