Sabahattin Gucukoglu wrote:
in particular: we need a simple way to
express host relationships inside an organisation that is independent
of external homing.
If renumbering is not a problem, it is simple and easy to do so
with IPv4.
You can assign both private and public addresseses to hosts, where
the private addresses express host relationships inside an organization
and are independent of external homing though the public addresses may
need renumbering.
A host may have a private address only, if the host does not need
end-to-end-transparent external communication and the host does
not need renumbering, extreme case of which is legacy NAT.
To make intra-organizational communication with private addresses,
a host (host with public addresses, only) software should be modified
so that, if the destination address is private/public, private/public
source address is used.
What do we have right now, first?
End to end NAT (draft-ohta-e2e-nat-00.txt) is a way to let
hosts optionally have public addresses for end-to-end-transparent
global communication, where intra-organizational routing is
performed only with private addresses that intra-organizational
routers are not affected by external homing.
End to end NAT is already implemented with source address
selection.
In addition, end to end NAT enables port-wise routing for global
addresses, which reduces IPv4 address consumption *SIGNIFICANTLY*
that we don't need IPv6.
Masataka Ohta
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