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Guest WiFi network isolation happens below the IP layer: you would use VLANs for that.

Setting up a VLAN for the first time isn't ridiculously easy, but it's the same whether you are using IPv4 or IPv6.

hint, the problem is doing ipv6 vlans with only a single /64. Spoiler alert: you can't do it while also following spec

Sure you can, the tradeoff is that you can't reliably do SLAAC (which I agree needs to get deprecated yesterday).

Which maybe will happen eventually with RFC 9686 & 9663. Those are getting activity and maybe eventually will enable an actual IPv6 future in, oh, another 20 years? give or take.

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