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One last question: is it through VLANs I get to have different networks connect to the same gateway/outside internet?

Edit: Also, I didn't shove a polish sausage into a videocassette recorder! It was sand into a tape deck. I wanted to hear what sand sounded like. Spoiler: a lot of crunching before it stopped working.

Good information - thank you for the direction. You're right - no one is berating me but I was just anxiously anticipating someone to highlight the stupid thing I overlooked. And I didn't notice the /24 and /32 until you just highlighted it.

I was thinking about implementing VLANs down the track to separate and tighten security up once I had it all up and running, but it looks like it might be better to do that now. I have gone through a few of posts you posted in the last few hours (namely READ THIS FIRST and planning my subnets first) and it has given me some things to think about. I was also going to do what you suggest as a trial: plug the switch into the WLAN port and stick the wireless AP into the switch and see if that works. I will investigate the bridged set up too and see if that works better.

Thanks!

I think this is even more basic: If your AP works on one port, you would either have to set up a LAGG to use the LAN also on a second port or attach the switch to the working LAN port and attach everything including the AP to that switch.

You cannot assign more than one port with the same network, see this, #1 and #2.

Then please show the configuration of all your internal interfaces ...

Something like this?
Screenshot1
Screenshot2
Screenshot3
Screenshot4
Screenshot5

I get this sinking feeling that I'll be apologizing like poor dave79. I've done something stupid and I am in the process of getting berated for my incompetency.
I was hoping to treat each port on the router like some interconnected network like a typical store bought router would work. But opnsense doesn't work like that? I understand a store bought router won't have nearly as much as features and control but I thought having a switch hang off a port wouldn't be a big stretch.

Did you create a firewall rule permitting devices connected to the switch to access the Internet? OPNsense comes with a default rule "allow all" on the LAN port (which your AP seems to be connected to) but for each port you add you must create a matching rule yourself.

I just used the allow all on both the LAN interface and the WLAN interface just for testing to ensure everything would come through. But still alas, no Internet.

On port 0 is WAN. This port is set to DHCP because its getting its IP from my NBN box - and that seems to be fine.

On port 1 is WLAN. It's a wireless router working in AP mode and that works flawlessly. I can get Internet to anything the has connected the WiFi AP - both is wirelessly and Ethernet.

On Port 2 is a Switch that at the moment has no restrictions on it. The devices that connect to the switch get DHCP but no Internet and have no idea why. I am using DNSmasq + Unbound.

I assigned the 3rd port the router (igc2) and assigned it a static IP of 10.10.10.5. Back on my computer (which is connected to the Switch), says that the default gateway, DHCP and DNS are all 10.10.10.5. The routers IP is 10.10.10.1 which is what I have the WLAN interface (static IP) configured to. I don't know why I did it like that or how that works but it does. Just to add confusion, according to the leases under DNSmasq, the Switch is coming up as 10.10.10.93 and is attached to the WLAN interface for some reason - I have no idea why.

I know this is probably very simple but I have clearly overlooked something. I would appreciate any kind of help.
Thanks.