When I presented this draft, Lorenzo explained that it's not good to
claim that ND is faster than DHCP (two messages instead of 4) because
DHCP has this Rapid Commit feature. To which I agree.
But, consider that in V2V2I we may need not only Prefix Delegation but
also route exchange at the same time (IV delegates a global prefix to
LV, and IV and LV exchange their self-formed ULA prefixes). This
operation could be realized with a minimum 2 messages (IV sends RA with
delegated prefix and its own ULA prefix whereas LV sends RA with its own
ULA prefix). This operation can not be achieved so with DHCP because
DHCP is request-response.
Moreover, DHCP as it stands today can not do route exchange at all. The
only possibility is maybe be with the ongoing DHCP route-option draft.
But there seem to be the same opposition to make that progress.
Alex
Le 19/10/2012 09:59, Alexandru Petrescu a écrit :
Dear participants to 6man group,
We just submitted "Prefix Delegation extension to Neighbor Discovery
protocol" draft-kaiser-nd-pd-00 available at:
http://tools.ietf.org/html/draft-kaiser-nd-pd-00
The context is vehicular environments, the goal to realize IP
vehicle-to-vehicle-to-infrastructure communications.
We had several problems to solve before materializing IP
connectivity between vehicles and up to infrastructure: which IPv6
addresses to use in a disconnected vehicle, how would one
Internet-connected vehicle offer access to several IP devices in a
nearby non-SIM-but-WiFi vehicle, etc.
To solve the latter, we started by using existing ND, DHCP and Mobile
IP protocols and realized that some mechanisms were missing. Some of
the needed mechanism was Prefix Delegation in ND (even though ND does
offer default route, address auto-config, _is_ widely available,
etc.)
Hence we conceived this PD method for ND which is just one part of a
bigger system. We have prototyped and experimented it.
We would like the 6man group to consider this draft.
Comments about the idea in this draft? About the problem?
Thanks in advance,
Alex
A New Internet-Draft is available from the on-line Internet-Drafts
directories.
Title : Prefix Delegation extension to Neighbor
Discovery protocol Author(s) : Arnaud Kaiser Sylvain Decremps
Alexandru Petrescu Filename : draft-kaiser-nd-pd-00.txt
Pages : 24 Date : 2012-10-15
Abstract: This document describes an extension to the Neighbor
Discovery protocol (ND). The proposed extension enhances ND by
providing it a new option: the Prefix Delegation option (ND_PD).
ND_PD offers the possibility for a router to ask for prefixes to
be delegated, even if no DHCPv6 Server (or Relay) are present on
link.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-kaiser-nd-pd
There's also a htmlized version available at:
http://tools.ietf.org/html/draft-kaiser-nd-pd-00
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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mailing list i-d-annou...@ietf.org
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directories: http://www.ietf.org/shadow.html or
ftp://ftp.ietf.org/ietf/1shadow-sites.txt
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