$ORIGIN example.com.
@               SOA server.example.com. hostmaster.example.com. (
                          1995032001 3600 3600 604800 86400 )
                NS  server.example.com.
                NS  ns1.ip-provider.net.
                NS  ns2.ip-provider.net.
; foobar - use old-slow-box or new-fast-box if either is
; available, make three quarters of the logins go to
; new-fast-box.
_foobar._tcp    SRV 0 1 9 old-slow-box.example.com.
                SRV 0 3 9 new-fast-box.example.com.
; if neither old-slow-box or new-fast-box is up, switch to
; using the sysdmin's box and the server
                SRV 1 0 9 sysadmins-box.example.com.
                SRV 1 0 9 server.example.com.
server           A   172.30.79.10
old-slow-box     A   172.30.79.11
sysadmins-box    A   172.30.79.12
new-fast-box     A   172.30.79.13
; NO other services are supported
*._tcp          SRV  0 0 0 .
*._udp          SRV  0 0 0 .