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 _______________________________________________ Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf