> Sorry wanted to add, or can I just go back to using the IP addresses of the server/client instead of broadcast?
No, you cannot do that. It will only find one of the IOCs on the server if you do that. You either need to use the directed broadcast mechanism or the iptables mechanism.
Out of which the iptables rule is the least invasive, because it is a once-and-for-all change that needs to be added only on the multiple-IOC host, and does not require any other changes in IOCs, network components or clients.
That's why it is featured on the how-to page.
Cheers,
~Ralph