Hello Masataka, The document you sent to this list is only a draft. The chances of getting end to end NAT globally deployed before the IPv4 address space runs out are very close to zero, as it needs changes in hosts and gateways. Also remember that we make policy for all uses of IP addresses, not just end user networks that have/get/need a limited amount of public addresses. These policies also apply to datacenters where servers are hosted. There are many examples where you can not put those servers behind a NAT box. Mandating NAT in the way you have stated in your messages is therefore not possible. We are not going to change address policy in the whole RIPE region because of a draft document that only covers a part of what addresses are used for. For some people/companies this might be a very interesting subject, but please end this discussion on the address policy mailing list. Thank you, Sander Steffann APWG co-chair