I have a Centos5 server on internet, say srv1.example.com with IP address say
I have changed the A records example.com, www.example.com and ny.example.com to say

I have not restarted BIND since the server hosts zones for other domains too.

The zone file has the $TTL of 86400.

After changing the A records, I tried nslookup, host, dig commands to see if I could get the IP address for example.com, www.example.com and ny.example.com. However, I am still getting the old IP address,

I have even flushed dns cache on client pc but no luck.

Can anyone think of anything that might have gone wrong in changing the A records? Or is there any other step that I still have to perform on the server?

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    Appart the TTL, changes will not apply by magic, you have to restart/reload something. If you don't want to restart bind, did you try "rndc reload" ? – krisFR Dec 12 '13 at 1:43
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    Also, did you update the serial number? You need to update the serial and reload for Bind to know a file has been changed. – Zoredache Dec 12 '13 at 1:45
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    You can use named-checkconf and named-checkzone to verify your changes before restarting bind to be sure it will come back up. – Ladadadada Dec 12 '13 at 1:59
  • I have increased the serial number and ran named-checkconf and named-checkzone. named-checkconf echoed 0 and named-checkzone returned OK which I believe that the two commands completed without any error. Server reload successful. Then I performed rndc reload as root. But the ip address is still the old one... – i_ch3ry Dec 12 '13 at 3:02
  • if you used nsupdate to make your changes you wouldn't have this problem. – Red Cricket Dec 12 '13 at 3:59

Your changes will not take effect until you:

  1. Increment the serial in your zone file.
  2. Run rndc reload as root.
  • Incremented serial in my zone file and performed rndc reload. Reload was successful but the IP address is still the old one. I flushed dns cache on client pc again but still no luck. – i_ch3ry Dec 12 '13 at 3:07
  • On ubuntu, performed sudo service nscd restart and then ran command host -t A example.com and host -t A ny.example.com but still showing the old IP address. – i_ch3ry Dec 12 '13 at 3:16
  • You didn't query your DNS server directly? – Michael Hampton Dec 12 '13 at 3:22
  • @MichaelHampton I just performed dig @ns1.example.com ny.example.com and it returned the new IP address. Now should I just wait till the TTL expires? – i_ch3ry Dec 12 '13 at 3:30
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    That's how DNS works. See Why does DNS work the way it does? – Michael Hampton Dec 12 '13 at 3:54

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