Hello,
You can just resolve this public FTP address on any internet-connected device, like your laptop or a phone:
╰> host public.dhe.ibm.com
public.dhe.ibm.com is an alias for dispby-112.boulder.ibm.com.
dispby-112.boulder.ibm.com has address 9.17.248.112
If your AIX box does not have internet access, this IP won't help you.
One way could be to configure connection over a proxy, if one is available in your environment.
You don't necessarily need to get your AIX box hooked up to the Internet - you can download the required files locally and install them. I suggest to have a look at a cool guide written by Mr. Nmon: https://www.ibm.com/support/pages/aix-and-yum-get-those-open-source-apps-aix-easy-way
Considering the doc was written 1.5 years ago, it refers to versions actual at the time. Today you would go for yum_bundle_v6.tar, and version 4.15.1.2 of rpm.rte - https://ftp.software.ibm.com/aix/freeSoftware/aixtoolbox/INSTALLP/ppc/rpm.rte.4.15.1.2)
Once you get this installed, you can setup a local yum repository replica. An easy way to do it would be to sync repo to a local NFS server, and configure your AIX endpoints' yum.conf to point to this NFS location (preferably automounted). This way you gain performance (no need for each individual AIX to go through your internet connection for packages) and security (no need to expose your AIX).
Cheers
#AIX#Support#SupportMigration