$ttl 38400
lab1.com.	IN	SOA	proxy.lab1.com. root.lab1.com. (
			1163574669
			10800
			3600
			604800
			38400 )
lab1.com.	IN	NS	proxy.lab1.com.
www.lab1.com.	IN	A	192.168.0.200
proxy.lab1.com.	IN	A	192.168.0.200
a.lab2.com      IN      CNAME   www.lab1.com.
b.lab2.com      IN      CNAME   www.lab1.com.
c.lab2.com      IN      CNAME   www.lab1.com.
d.lab2.com      IN      CNAME   www.lab1.com.
e.lab2.com      IN      CNAME   www.lab1.com.
f.lab2.com      IN      CNAME   www.lab1.com.