The following code example shows the named.local file used by the two master 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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