Exactly, many previous unsuccessful discussions at IETF about 240/4: IPv6 is the only viable long-term solution. The effort to “reinvent” any part of IPv4 or patches to it, then test that everything keeps working as expected, versus the benefits and gained time, it is much best invested in continue the IPv6 deployment which is already going on in this region and the rest of the world. It would not make sense, to throw away all the efforts that have been already done with IPv6 and we should avoid confusing people. I just think that even this thread is a waste of time (and will not further participate on it), time that can be employed in continue deploying IPv6. Regards, Jordi @jordipalet El 12/3/22 6:32, "NANOG en nombre de Greg Skinner via NANOG" <nanog-bounces+jordi.palet=consulintel.es@nanog.org en nombre de nanog@nanog.org> escribió: On Mar 10, 2022, at 8:44 PM, Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp> wrote: IIRC, at some time, perhaps when CIDR was deployed widely and having something other than IPv4 was a hot topic, there was a discussion on releasing 240/4 in IETF. Reasonings against it were that the released space will be consumed quickly (at that time, NAT already existed but was uncommon) and that new IP will be designed and deployed quickly (we were optimistic). Masataka Ohta There have been many discussions about 240/4 in the IETF. For some examples, query “240/4” in the ‘ietf’ mail archive on mailarchive.ietf.org. —gregbo ********************************************** IPv4 is over Are you ready for the new Internet ? http://www.theipv6company.com The IPv6 Company This electronic message contains information which may be privileged or confidential. The information is intended to be for the exclusive use of the individual(s) named above and further non-explicilty authorized disclosure, copying, distribution or use of the contents of this information, even if partially, including attached files, is strictly prohibited and will be considered a criminal offense. If you are not the intended recipient be aware that any disclosure, copying, distribution or use of the contents of this information, even if partially, including attached files, is strictly prohibited, will be considered a criminal offense, so you must reply to the original sender to inform about this communication and delete it.