On Aug 8, 2007, at 1:22 PM, David Conrad wrote:
On Aug 8, 2007, at 10:18 AM, Hallam-Baker, Phillip wrote:
Which widespread IPv4 stacks?
I think it might be easier to identify stacks that don't disallow
240/4. I don't actually know of any widespread ones.
Rather than wall off the space as private and thus put it beyond
any use we should think about what other uses we might be putting
Calling address space private obviously does not "put it beyond any
use". In fact, there are folks out there who are burning public IP
address space for internal infrastructure that could instead be
using private space but can't because their internal
infrastructures are too large.
The long term view for IPv4 employment should be an address space
primarily used by internal networks. IPv4 is supported by a large
array of SOHO equipment that will not disappear anytime soon. A near-
term solution for IPv4 exhaustion will likely involve routers
bridging between either private or public IPv4 address space into an
Internet consisting of a mixture of IPv6 and IPv4. Internal use of
IPv4 should accommodate internal deployments exceeding 16 million IP
addresses. With rapid expansion of network equipment, 268 million
addresses represents a far more reasonable range of addresses that
rangers which are likely to be employed internally.
Such a larger range of internal addresses could even encourage use of
older IPv4 router equipment to support these larger internal
networks. An aggressive strategy using this approach could be far
more effective at postponing an enviable exhaustion of IPv4 addresses
than would a year to few months reprieve a public assignment of the
Class E space might provide. Not having a larger IPv4 private
address space will cause existing IPv4 equipment to be less valuable
when it can only be utilized within extremely limited address ranges
by any particular organization. : (
BTW, there is a typo after
2. Caveats of Use
Many implementations of the TCP/IP protocol stack have the
This should have been 240.0.0.0/4 addresses.
Ietf mailing list