O Maintain Secondary Servers

All DNS-aware software allows you to specify a secondary and possibly tertiary server in its configuration. Additionally, the NameService record, more commonly called the NS record, for a zone (which specifies its authoritative DNS servers) allows multiple specifications: The main server is called the master whereas secondary servers are slaves. DNS does not and should not make any distinction between them.

Failing to provide DNS records for your zone or address space, even temporarily, could lead to denial of service conditions and present a scenario favorable for spoofing attacks. For this reason, you should always maintain a reliable infrastructure including at least one secondary server.

; <<>\> DiG 9.3.0 <<>\> -t ns google.com ;; global options: printcmd ;; Got answer:

;; ->\>HEADER<<- opcode: QUERY, status: NOERROR, id: 21063

;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 4

; ; QUESTION SECTION: ;google.com.

;; ANSWER SECTION:

google.com. 152248 IN NS

google.com. 152248 IN NS

google.com. 152248 IN NS

google.com. 152248 IN NS

ns1.google.com. ns2.google.com. ns3.google.com. ns4.google.com.

; ; ADDITIONAL SECTION:

ns1.google.com. 161231 IN A 216.239.32.10

ns2.google.com. 161231 IN A 216.239.34.10

ns3.google.com. 161231 IN A 216.239.36.10

ns4.google.com. 161231 IN A 216.239.38.10

Query time: 91 msec

SERVER: 140.105.134.1#53(140.105.134.1) WHEN: Sat Nov 4 16:39:20 2006 MSG SIZE rcvd: 164

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