How to configure DNS in Solaris and AIX?

It is very simple.
Solaris
1) Create /etc/resolv.conf file with your DNS server entries
    Ex:
    bash-2.05$ cat /etc/resolv.conf
                      nameserver 10.999.9.999      #First preference server to look
                      nameserver 10.999.9.999      #Second preference server to look
                      search=domain.comp.net

2) Modify the file /etc/nsswitch.conf
    Look for
      "hosts: files"
    in this file and replace it with
     "hosts: files dns"

Thats it. DNS will be enabled


AIX
1) In /etc/netsvc.conf check for
hosts = local, bind


where the entry "bind" is for dns


2) Modify /etc/resolv.conf file with your DNS server entries

    Ex:

    bash-2.05$ cat /etc/resolv.conf

                      nameserver 10.999.9.999      #First preference server to look

                      nameserver 10.999.9.999      #Second preference server to look

                      search=domain.comp.net

Note: You can use smitty to configure this