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As noted in examples for master and slave, it is possible to accept DNS UPDATE messages.
When the zone is configured as a slave and DNS UPDATE messages is accepted, server forwards the
message to its primary master specified by xfr-in
directive. When it receives
the response from primary master, it forwards it back to the originator. This finishes the transaction.
However, if the zone is configured as master (i.e. not having any xfr-in
directive), it accepts
such an UPDATE and processes it. As of 1.2, there are a few limitations with DNSSEC signed zones described below. Other than that, UPDATE of unsigned zones works as expected without any limitations.