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dns64: Fall back to plain AAAA query with synthall but no A records
Networks which only have tunneled IPv6 access but still want to go IPv6-only internally can use unbound's DNS64 module together with the dns64-synthall or dns64-ignore-aaaa options to direct most traffic (any dualstack domain) to their NAT64. There is only one problem with this setup, currently domains with only AAAA records will fail to resolve. To allow for this use-case arrange for the A sub-query to make the AAAA super query advance along the module stack when no records are returned. Signed-off-by: Daniel Gröber <dxld@darkboxed.org>
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