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Remi Denis-Courmont wrote : > The issue is with *cascading*routers. With no bits to do routing > within a site, if bridging is not possible, there is no choice but to > use NAT. There is IMHO a better alternative: where no IPv6 prefix is available, like behind a cascading router in a /64 site, use another available tool. (Teredo, tunnel broker etc, are IMU availble precisely for this). > Where is the complexity in shifting some bits? Right, "shifting bits" is simple. It works if each ISP hasonly one RIR-provided prefix for all its customers, but *only in this case*. Personally I don't know how many v4 prefixes Free has, and plans to use. But, as you know, ISPs tend to get their v4 address space piece by piece. The complexity starts. Rémi |