Le 21/10/2012 23:45, Mark Smith a écrit :
----- Original Message -----
From: Alexandru Petrescu <alexandru.petre...@gmail.com>
To: sth...@nethelp.no
Cc: ipv6@ietf.org
Sent: Sunday, 21 October 2012 4:56 AM
Subject: Re: Announcing Prefix Delegation extensions to ND
draft-kaiser-nd-pd-00.txt
Le 20/10/2012 18:36, sth...@nethelp.no a écrit :
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.
The obvious conclusion to this argument is that a *lot* of DHCP
functionality will be duplicated in ND. Is this where we want to go?
I guess yes, and vice-versa.
I'm coming from the DHCP side of the argument. In my world DHCP is
needed because it gives you a single place to handle dynamic address
allocation, *and* it ties in with all sorts of support & backend
systems.
Well yes, when that backend is a fixed infrastructure with things
planned, highly human assisted. But in a dynamic yet simple network
(without assistance of various backend) it's hard to use DHCP: a Relay
can't 'discover' a Server,
Actually it can, as the destination address for the server the relay uses
can be the all-dhcp-serviers site-local (FF05:0:0:0:0:0:1:3) multicast
address. DHCPv6 uses multicast addresses where ever possible for these
sorts of scenario.
But isn't it that the DHCPv6 server must have a conf file which records
in a fixed way the Relay's IP address?
Alex
Geographically distributed DHCPv6 servers can then be
a member of a multicast that spans locations across the network.
RFC3315, 5.1. Multicast Addresses
DHCP makes use of the following multicast addresses:
All_DHCP_Relay_Agents_and_Servers (FF02::1:2) A link-scoped
multicast address used by a client to communicate with
neighboring (i.e., on-link) relay agents and servers.
All servers and relay agents are members of this
multicast group.
All_DHCP_Servers (FF05::1:3) A site-scoped multicast address used
by a relay agent to communicate with servers, either
because the relay agent wants to send messages to
all servers or because it does not know the unicast
addresses of the servers. Note that in order for
a relay agent to use this address, it must have an
address of sufficient scope to be reachable by the
servers. All servers within the site are members of
this multicast group.
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