The following code example shows the named.local file used by the two primary servers on the two networks. Both servers have the same file.
; SOA rec
0.0.127.in-addr.arpa. IN SOA siriusdoc.com. sysop.centauri.doc.com. (
                           19970331    ; serial number
                           10800       ; refresh every 3 hours
                           10800       ; retry every 3 hours
                           604800      ; expire after a week
                           86400 )     ; TTL of 1 day
; Name Servers
0.0.127.in-addr.arpa.  IN  NS   sirius.doc.com.
0.0.127.in_addr.arpa   IN  NS   dnssecond.doc.com
1  IN  PTR localhost.
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