"I'll preface this by saying while I'm pretty good with IT in general (I'm a senior ICT technician), networks aren't my thing and this question will probably sound really daft, but here goes. :D
I've just set up a firewall running OPNsense, mainly to wall off a web server from the rest of my network. This is behind my ISP router with a double NAT, which I know isn't ideal but I don't really want to interfere with the rest of my network for the sake of my wife! This is basically working now, and I can access all my stuff over the internet using the Caddy reverse proxy plugin.
Where things get messy is when I try to access sites from my ISP router network using the OPNsense WAN interface, and I've narrowed it down the gateway. If I set the WAN interface gateway rule to my ISP router, I can get out to the internet from LAN clients but I can't access my LAN websites using NAT rules from my WAN network. If I set the gateway rule to "disabled", my NAT rules all spring into life and I can access my websites from my WAN, but I can no longer access the internet from my LAN.
I'm sure there must be a simple solution to this, but I seem to be hitting a wall. Does anyone have any advice?
EDIT: Solved!
After a lot of trial and error I remembered that I had to set an outbound NAT rule for my VPN in order to access addresses on my internal WAN, so I thought I'd try the same for my LAN. Just like that, I can access WAN addresses from my LAN, and more importantly break out to the internet. :D
I also figured out how to stop the little tune my firewall plays when you power off and on, so that's a double achievement.
Thanks to those that offered suggestions, and sorry for my no doubt very confusing post.
