What I wish I knew when I got my ASN
One thing I find slightly confusing/frustrating about IPv6.You're discouraged from using ULAs (basically the equivalent of private addresses from v4) as they'd rather you use GUAs. But you get your GUAs from your ISP normally, which means if you change your ISP you need to renumber your network. They also generally frown on NPT66. So the supported solution is to get PI space. But to get PI space you need to have an ASN first, which requires you to have public peers, which are you just expected to get someone to peer you and then just firewall all the incoming traffic? These seems to be the one option for stable addresses on a IPv6 network that is not vaguely disapproved of.Or what people actually do is avoid all that complexity and run IPv4 locally and use RFC1918 addreses NAT46, which seems like a self inflicted defeat to the IPv6 first aims of the IETF, IANA and the RIRs.