How internet addressing really works
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(This is a very rough draft...)
There're 2 ways to get to a machine.
IP address & name.
But to use name, you need to have DNS set up.
Either way, there's also the port.
The port is specific to the actual service on the machine.
i.e.: port 80 is HTTP, port 443 is HTTPS, port 22 is SSH...
When your entire network is on a single address as far as the outside world is concerned, you have a couple options to access individual machines.
You can forward specific ports to specific machines (probably with a bit of fiddling in Firewall/NAT on your pfSense box...) or you can set up proxies.
Port forwarding is pretty straightforward, but you need to remember how you've set up the ports.
