An Internet connection is not required for Red Hat Network Satellites running in completely disconnected environments. This feature instead uses Channel Content ISOs that can be downloaded to a separate system to synchronize the Satellite with the central Red Hat Network Servers. All other Red Hat Network Satellites should be synchronized directly over the Internet.
If you are running a disconnected Satellite that is not registered to Red Hat Network Hosted the installation program will note and return a list of any missing additional packages needed beyond
@base to be installed, then the installation program will exit. This allows you to install those packages. You may want to use the installation ISO image or DVD media to create a repository for those additional packages, and then rerun the Satellite installer.