Linux dns TTL time control

[oracle@testdb01 ~]$   host -a testdb02


result sample of command:

;; QUESTION SECTION:
;testdb02 IN   A

;; ANSWER SECTION:
testdb02 492 IN A      192.168.3.24


492 is remaining time  of TTL.   if you try againg TTL is reduced




You can control on windows and unix with nslookup set debug on.