Re: draft-bourbaki-6man-classless-ipv6-00

In message <3fc473c3dc2b4d86ba6e20b5fd49a0c9@XCH15-06-11.nw.nos.boeing.com>, "M
anfredi, Albert E" writes:
> From: Mark Smith [mailto:markzzzsmith@gmail.com] 
> 
> > * DHCPv6 does not record addresses in use on a link. It will not
> > record link local addresses or manually configured addresses. It
> > is only recording hosts that asked to acquire addresses via DHCP.
> 
> Okay, like DHCPv4. But when the system admin needs stable addresses for
> hosts in the network, e.g. a peer-peer network that does not use a DNS,
> DHCPv6 PD is a good tool to have.
> 
> > * You're overlooking the cost and service impact of renumbering to
> > increase the size of the subnet if it isn't large enough. That can
> > be a large cost and large impact if many hosts are involved. So
> > large, I've seen people avoid paying it when there were in the
> > order of 1000 hosts involved on an IPv4 network - the hosts were
> > spread across 4 x /24s on the same Ethernet segment.
> 
> Depends on the scenario. In my reality, expanding a network at the edges
> easily, without involving in any way the authority that allocates blocks
> of addresses, is quite valuable. A scheme that makes this difficult is
> instead a nuisance.
>
> What's behind this debate, from my point of view, is a need for the same
> functionality offered by NAT in IPv4, but without incurring the penalties
> of using NAT. A fixed IID length of 64 bits, when /64s or maybe even /56s
> are what customers are given, is a bit like never having invented NAT for
> IPv4. It's limiting. I realize this view is not everyone's concern.

Go complain to the ISP, really.  The IETF allocation scheme was a
/48 for every site and additional /48s if you needed them.  Thats
10's of thousands of /48's per person on the planet.  Thats 100 of
millions of subnets.  If your ISP isn't supplying you with a /48
and additional /48's if needed they are not doing their job.

Just because something is technically possible, can be made to work,
it doesn't mean that it is a good thing.  There a plenty of examples
of where it is a bad thing.

> Bert
> 
> --------------------------------------------------------------------
> IETF IPv6 working group mailing list
> ipv6@ietf.org
> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
> --------------------------------------------------------------------
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org