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→IP addresses required for Firewall and Primary DNS ACLs
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<blockquote>Starting from March 2025, in addition to legacy <code>secondary-dns.co.uk</code> IP addresses we will also initiate zone transfers from the newer DNS Infrastructure:
* <code>zonetransfers-a.secondary-dns.co.uk</code>; <code>zonetransfers-b.secondary-dns.co.uk</code>;
* <code>zonetransfers-a.primary-dns.co.uk</code>; <code>zonetransfers-b.primary-dns.co.uk</code>;
Legacy <code>secondary-dns.co.uk</code> will still be in use until mid-2025. Therefore, please keep these in your ACLs for the moment until this advice changes.</blockquote>
==Abridged Example Configuration for a BIND9 Authoritative DNS Server==
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