Alcun Atirutan BBS

As long as ISPs are reasonable, they'll be giving /56's to those who need more than one network, and that gives you 256 subnets to screw with without nat. there's enough address space to give every current ipv4 internet address 2^24 of these 256 subnets. A lot of ISPs just let you request a /56 no questions asked.
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@kazriko @cks I use IPv6 NAT because at one point the DHCPv6 was busted on Fedora. The autoconf was purely a kernel mechanism, so it continued to deliver me a /128. Also, although renumbering is supposed to be painless on IPv6 in theory, it is not painless in practice.