update-policy wildcard grant

[Tony Finch]

Jim Popovitch via bind-users <bind-users at lists.isc.org> wrote:
>
>    update-policy {grant webserver-tsig-key wildcard _acme-challenge.* TXT;};

Sadly in the DNS a wildcard * can only occur as the leftmost label in a name.

RFC 4592 has more than you ever wanted to know about DNS wildcards. It's
not pretty.

Tony.
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