troubleshooting Question

changing dns server ip

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uilli asked on
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I have a somewhat stupid question but I always seem to have hard time understanding how dns works

I have a windows server with dns set up for some  websites. this server address is lets say
Since I changed internet company I have to change its address to
Do I need to just change the address in dns properties and the ip address of the machine? will the parent dns's then discover the change of ip and update themselves automatically?

I also wanted to move the current dns server to a centos virtual machine with bind9
can I put the server in dmz and use a virtual ip in the firewall config using pointing to the server ip address?

sorry for the intricate explanation but I really make confusion about this stuff

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