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plugin/dns64: reject unsupported prefix lengths (#8611)
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@@ -20,6 +20,8 @@ dns64 [PREFIX]
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~~~
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* **PREFIX** defines a custom prefix instead of the default `64:ff9b::/96`.
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Its length must be 32, 40, 48, 56, 64, or 96 bits, as defined in
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[RFC 6052 Section 2.2](https://www.rfc-editor.org/info/rfc6052/#section-2.2).
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Or use this slightly longer form with more options:
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