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> My ISP regularly messes up with its ipv6 routing

Can you expand on this? I recently upgraded my network to support ipv6 but a big concern I have is what if they (Verizon Fios) change my assigned block? How can I make sure my PI hole and server has the same static IP address?

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In that situation, don't connect to your pi hole using its GUA (global address, starting with 2), connect with it's ULA (link-local address, starting with f). Link local addresses are not routed outside your LAN, so they don't change when your ISP changes your prefix.

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