filter-aaaa-on-v4 does not filter AAAA if there is no existing A Record with the same FQDN - working as designed?

[Tony Finch]

addie <addie at gmx.ch> wrote:
>
> is this working as designed or not? if yes, for which reasons?

It isn't documented, but there is a comment in the code which says:

	/*
	 * The filter-aaaa-on-v4 option should suppress AAAAs for IPv4
	 * clients if there is an A; filter-aaaa-on-v6 option does the same
	 * for IPv6 clients.
	 */

https://source.isc.org/cgi-bin/gitweb.cgi?p=bind9.git;a=blob;f=bin/named/query.c;hb=HEAD#l8311

The actual logic is considerably more complicated than that so I won't dig
into the details of what it does in particular situations...

Tony.
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