After I rebooted CRONULLA, I found I had several issues.
I found the following issues:
I updated the following two (2) files on GRIDCTRL to match the data presented in IP Addresses:
And I restarted the named service.
On CRONULLA, I created /etc/resolv.conf with the following content:
search yaocm.id.au nameserver 192.168.1.252 nameserver 10.1.1.1
On CRONULLA, I updated /etc/sysconfig/network-scripts/ifcfg-eth0 with the following content:
ONBOOT=yes
I had forgotten to set the NIC to Bridged Network instead of NAT. Used VirtualBox to change the settings for the NIC.