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Yeah, you’re absolutely correct. I misread that thinking OP would have the CG NAT endpoint and taikscsle on the same physical device, which, I still think, would be a problem: you'd have two interfaces for 100.64.0.0/10. But if CG NAT terminates on the modem and you run taikscale on devices connected to it them there's surely no issue at all.
I run it on my router which has the CG-NAT IP address.
Whilst you’re right that it could clash, it’s very unlikely (a 1 in 4194302 chance), I imagine Tailscale would detect the clash and change IPs though I could be wrong as it never happened to me (and probably never will - though in all fairness it will eventually happen to someone).
I went looking into how that works, and, apparently, tailscale adds individual node routes (in table 52). So yeah, you have very low chances of getting into trouble even if you have an interface with 100.64/10.