On 5 Apr 2012, at 12:20, Masataka Ohta wrote: > However, as 8B long addresses cloud have cost 8*B bytes and > that 6B long addresses with 4B IPv4 addresses and 2B port > numbers, which is the address space provided by NAT, is more > than enough, there is no point to have IPv6 ID/LOC separation > nor IPv6, especially because NAT can be end to end transparent. How do you propose to make end-to-end crypto of packets possible where NATs are involved? I'm assuming you think everything can be solved with signalling, yes? I ask because NPT could be the end of it if we all agreed to use the right kind of signalling. Cheers, Sabahattin