On 04/12/2012, at 9:30 AM, Ronald Bonica <rbonica(_at_)juniper(_dot_)net> wrote:
Geoff, Randy,
Having reflected on your comments, I think that the two of you may be
approaching the same problem from two directions. I will try my best to
articulate the problem. When we agree that we have a common understanding of
the problem, we can decide whether to fix draft-bonica or abandon it.
Geoff points out that each of the entries mentioned in draft-bonica can be
characterized as one of the following:
- a special purpose address assignment
- a address reservation
All compliant IP implementations must respect special purpose address
assignments. As Randy puts it, special purpose address assignments should be
baked into IP stacks.
However, the same is not true of address reservations. While operators may
afford special treatment to packets that are sourced from or destined to
reserved addresses, these treatments should not be baked into IP
implementations. They should be configurable.
Currently, there is nothing in draft-bonica that distinguishes between
special purpose address assignments and address reservations. If we were to
continue with this draft, we would have to add a field that makes this
distinction. Having added that field, we should also make clear that that
field, and only that field, determines whether an address should be baked
into IP stacks?
Randy, Geoff, have I restated the problem accurately?
I'd use the opposite terminology. e.g.:
- I regard 0.0.0.0/8 as a "reservation", and should be baked into IP stacks
- I regard 192.88.99.0/24 as a "special purpose assignment" and is
configurable by IP stacks.
In IPv4 my understanding of the current set of "reservations" are:
0.0.0.0/8
127.0.0.0/8
169.254.0.0/16
224.0.0.0/4
240.0.0.0/4
All others I would see as being special purpose assignments, given that they do
not require special baked-in treatment by IP stacks.
My personal preference would be to:
-- record all special purpose assignments in a special purpose assignment
registry, such as
http://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xml
for Ipv4
-- record all reservations in the address protocol registry, such as
http://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.xml for
Ipv4
regards,
Geoff