$TTL 300	; 5 minutes
@			IN SOA	ns root (
				2000082401 ; serial
				1800       ; refresh (30 minutes)
				1800       ; retry (30 minutes)
				1814400    ; expire (3 weeks)
				3600       ; minimum (1 hour)
				)
			NS	ns
ns			A	10.53.0.2
sld			NS	ns.sld
ns.sld			A	10.53.0.1