Reverse DNS lookup doesn't match hostname

nikhil asked:

There’s a service on our local intranet that depends on the hostname mapping to the ip address, it is failing for a centos host inside of a virtual machine. I have set the virtual network adapter as bridged.

➜ ~ dig +short nikhil-vm
172.27.12.134 
➜ ~ dig +short -x 172.27.12.134 
ubuntu-server.xyz.com 

What can I do to fix this?

My answer:


Add a PTR record to your intranet’s DNS server(s) specifying the desired hostname for that IP address.

For instance, for a BIND zone 12.27.172.in-addr.arpa:

134     IN      PTR     nikhil-vm.intranet.invalid.

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