On 26 Sep 2011, at 18:41 , Keith Moore wrote: > The problem isn't in the difficulty of finding these changes and fixing them, for currently maintained code. The problem is in the zillions of systems in the field that have assumptions about 240/4 wired into them, most of which either have no automatic upgrade mechanism, aren't set up to use it, or aren't being maintained. This is the traditional problem with using 240/4, but it doesn't really apply in this specific case, because those addresses will only be touched by the CGNs in the ISP network, the routers in the ISP network and the home gateways. So especially in the case where NAT444 is only used for new customers this may not be an issue at all. _______________________________________________ Ietf mailing list Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf