$ORIGIN . $TTL 604800 ; 1 week 0.168.192.in-addr.arpa IN SOA deb-dns1-al.sio1lab.lan. root.sio1lab.lan. ( 2 ; serial 604800 ; refresh (1 week) 86400 ; retry (1 day) 2419200 ; expire (4 weeks) 604800 ; minimum (1 week) ) NS deb-dns1-al.sio1lab.lan. AAAA ::1 $ORIGIN 0.168.192.in-addr.arpa. 160 PTR deb-dhcp-al 161 PTR deb-dns1-al 162 PTR deb-dns2-al deb-dhcp-al A 192.168.0.160 deb-dns1-al A 192.168.0.161 deb-dns2-al A 192.168.0.162 dhcp CNAME deb-dhcp-al dns CNAME deb-dns1-al dns2 CNAME deb-dns2-al