>> My info is, to set >> sysctl -w net.inet6.send.opstate=0 >> to go back to mac address based eui64, but didn't checked it. > > Please don't resort to eui64. That's a bad idea. See RFC7721 and RFC707 Hmm, yes but from an operating view...
In case of re-numbering your network, RFC72177217 (and SEND as well) is a step backward. Both EUI48 and the Windows random stable IID mech have the benefit of prefix independent IIDs. The change of name to IP mapping in the DNS is ways easier if the IID remain the same. I have a small programm to re-generate additional AAAA records if I have to introduce a new provider prefix (and delete the old one as well). If the IID is prefix dependent (CGA, RFC7216), than the best (or the only scalable way) is that the host itself updates the DNS via dynamic updates. And integrating dynamic dns into standard operating systems is another thing I'm waiting for a long time now. BR Holger
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