Configure DNS via resolv.conf on AIX
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As per https://www.ibm.com/docs/en/aix/7.2?topic=formats-resolvconf-file-format-tcpip we need to directly create /etc/resolv.conf file on AIX to configure DNS. The syntax is similar to modern Unix systems such as:
domain DomainName nameserver <Address1> nameserver <Address2>
For example:
domain example.com nameserver 10.1.1.1 nameserver 10.2.2.2
This assumes '/etc/netsvc.conf' has 'hosts=local,bind' default value.
Refer: