March 2007
Intermediate to advanced
304 pages
11h 12m
English
Content preview from Linux System Administration
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Editing the Configuration Files
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61
# dig centralsoft.org
; <<>> DiG 9.2.1 <<>> centralsoft.org
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 48489
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;centralsoft.org. IN A
;; ANSWER SECTION:
centralsoft.org. 86400 IN A 70.253.158.42
;; Query time: 198 msec
;; SERVER: 81.169.163.104#53(81.169.163.104)
;; WHEN: Sat Mar 11 18:55:21 2006
;; MSG SIZE rcvd: 49
As you see, this lookup returns the IP address 70.253.158.42.
Now we can do a reverse lookup:
# dig -x 70.253.158.42
; <<>> DiG 9.2.1 <<>> -x 70.253.158.42
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4096
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;42.158.253.70.in-addr.arpa. IN PTR
;; ANSWER SECTION:
42.158.253.70.in-addr.arpa. 5304 IN PTR centralsoft.org.
;; Query time: 2 msec
;; SERVER: 81.169.163.104#53(81.169.163.104)
;; WHEN: Sat Mar 11 18:57:54 2006
;; MSG SIZE rcvd: 98
The forward and reverse lookups match each other. Our primary server setup is
complete.
Configuring the Secondary Nameserver
Next, let’s set up our secondary nameserver, server2.centralsoft.org. It will act as a
backup nameserver in case the primary (server1.centralsoft.org) fails, so that people
can still look up centralsoft.org and its subdomains.
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