This is more of a networking question than Confluence. But. Your server has an ip address, which other systems can use to send it stuff over a network. You need to set up your network so that there is a route from the outside world to that server that machines on the network can use. BY default, most places will firewall it off, so you need to open the firewalls. Also, it's likely that you'll be using internal IP addresses, so you'll want to use port-forwarding or NAT to say "when stuff arrives on our external address on url X, send it on to my server". And you'll want to think about names and urls.
The really simple setup I use at home is
That really is quite a simple setup, your organisation is very likely to be a lot more complex. Talk to your network guys
Do you mind to change the title of this question to someone more specific? Could be something like "Configuring Confluence to allow access from internet". This will help other users who might have a similar question find what was discussed on this topic.
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