If not set the default pipebackend-abi-version is 1. When set to 2, the local-ip-address field is added
after the remote-ip-address. (the local-ip-address refers to the IP address the question was received on). When
set to 3, the real remote IP/subnet is added based on edns-subnet support (this also requires enabling 'edns-subnet-processing').
+ When set to 4 it sends zone name in AXFR request.
</para>
</listitem>
</varlistentry>
<para>
AXFR-queries look like this:
<screen>
-AXFR id
+AXFR id zoneName
</screen>
-The id is gathered from the answer to a SOA query.
+The id is gathered from the answer to a SOA query. ZoneName is given in ABI version 4.
</para>
</sect3>