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Slave zones are for domain names, not for networks.
in bind, a slave zone is defined as follows:
// named.conf fragment
zone "example.com" in {
type slave;
file "slave.example.com";
masters {192.168.2.7; 10.2.3.15 port 1127; 2001:db8:0:1::15;};
};
As you see, the slave define the ip address of the master DNS server, and in the Master you need to add
slaves { ip.of.your.slave.dns.serve
That's it.