I don't want to go too far down this road, as it touches sensitive network architecture issues, but I think you're thinking of this in terms of a box. Please think, instead, of a regional network with failover capabilities and widely distributed customers. The aggregate need is (at least) a /10 for a large number of providers. Chris On 12/8/11 12:35 AM, "Måns Nilsson" <mansaxel@xxxxxxxxxxxxxxxx> wrote: >The space is going to be reused several times anyway, and NAT (be it >carrier, enterprise or SOHO) breaks pretty badly when session space >is exhausted. It does not make sense to have much more than a, say, >/16 behind each. (CGN is just NAT in a NEBS certified enclosure with an >expensive support contract; the basic b0rkenedness remains.) _______________________________________________ Ietf mailing list Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf