$TTL 5
@ 	IN	SOA	ns1 hostmaster 1 3600 1200 3600000 3600
@	IN	NS	ns1
ns1	IN	A	10.0.0.1
sub 	IN	SOA	ns2 hostmaster 1 3600 1200 3600000 3600
ns2	IN	A	10.0.0.2