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3.1.2. dig
If you installed the dnsutils package you can test your setup using the DNS lookup utility dig:
• After installing BIND9 use dig against the loopback interface to make sure it is listening on port 53. From a terminal prompt:
dig -x 127.0.0.1
You should see lines similar to the following in the command output:
;; Query time: 1 msec
;; SERVER: 192.168.1.10#53(192.168.1.10)
• If you have configured BIND9 as a Caching nameserver "dig" an outside domain to check the query time:
dig ubuntu.com
Note the query time toward the end of the command output:
;; Query time: 49 msec
After a second dig there should be improvement:
;; Query time: 1 msec