zone "stockholm.minsk.prac.os3.nl.zone" IN {
        type master;
        masters { 145.100.104.60; };
        file "stockholm.minsk.prac.os3.nl.zone"
        notify yes;
        allow-transfer { 145.100.104.52; };
        also-notify { 145.100.104.52; };
};

zone "minsk.stockholm.prac.os3.nl.zone" IN {
        type slave;
        masters { 145.100.104.52; };
};